Osaki OS 4000LS Massage Chair Review

Osaki OS 4000LS Massage Chair


Back Massage


Foot Massage


Air Compression Massage


User Flexibility (Height/Weight)


Value For Money



  • Only Requires 4 Inches Of Clearance From The Wall! (See Space Saving Technology Below)
  • Spring Loaded Footrest That Can Extend/Retract As Required
  • 42'' Quad L-Track Rollers That Go From Neck To Glutes!
  • Shoulder Widths Can Be Adjusted To Accommodate Different Body Types!


  • Not The Best Value For Money!

What Is The Osaki OS 4000LS?

The OS 4000LS is a mid to high end massage chair. Even though its been around for a couple years, it’s still one of the newer units in Osaki’s lineup. That being said, you can expect the latest airbag and roller tracking technology.

 The OS 4000LS is very much suited for someone who likes a strong, high intensity massage! 

We’ll touch on this later in the post, but for now let’s look at 7 key features of the OS 4000LS!


7 Noteworthy Features Of The Osaki OS 4000LS!

If you’re familiar with Osaki massage chairs, or have been reading my review posts, you’ll notice a striking similarity between the 4000LS & other models such as the pro maxim and 4000T. If all this confuses you, don’t worry about it too much for now. Later in the post, we’ll do a comparison between each of these units, so you can see the exact differences!

#1 42” L-Track Rollers

S-Track, L-Track, 3D, 4D. What in the world do these mean!?

 In layman terms, they’re just fancy ways of describing the technology associated with massage chair back rollers! 

Let’s look at S-Track & L-Track specifically, since that’s the technology used on this particular chair.

    • S-Track—This type of roller system follows the natural “s curvature” of the back. In case you didn’t know, your spine is “s” shaped. As you can now imagine, straight track rollers will probably not be as effective at massaging your back, hence the S-Track!
    • L-Track—Most people confuse L-Track and S-Track, when the 2 are really not so different. L-Track is basically S-Track, only with an extended tracking span. L-Track is able to track the neck all the way down to the glutes, and sometimes more. The reason this technology is called L-Track is because of the characteristic “L” shape made from neck to hamstrings or glutes. The image below illustrates exactly what I’m talking about!
See Why It's Called L-Track?
See Why It’s Called L-Track?

This particular chair features quad L-Track rollers that have a tracking span of 42 inches. Quite the distance if you ask me!

#2 Reduced Airbags

Osaki have been working to optimize airbag surface area coverage. This means fewer airbags that can cover maximum area. Although reduced airbags may sound like a bad thing, it really isn’t.

 A reduction in airbags results in a direct reduction of power consumption! (fewer valves and pumps) 

That  being said, the Osaki OS 4000LS has a total of 24 airbags. What’s the purpose of airbags you ask?

 They inflate with high pressure air, and provide a compression type massage on surrounding muscle and tissue! 

If you’ve ever had your blood pressure taken, that’s kinda how compression massage feels like, although intensity can be increased or decreased.

Where exactly are the airbags located? Osaki have placed airbags in all areas that are outside the reach of rollers. These include shoulders, arms, hands, calves, lower back, and some of the foot area. The image below shows the exact location of all the airbags (shaded in blue).

Blue Bubbles Show Where All 24 Airbags Are Located
Blue Bubbles Show Where All 24 Airbags Are Located

#3 Space Saving Technology

Another feature you tend to see in most of Osaki’s new lineup is this “space saving technology”, as they like to call it. What is space saving technology anyways?

 It’s a common feature in most L-Track chairs. Basically, it’s the chair’s ability to slide slightly forward during normal and reclined operation. 

Pretty simple when you think about it. Most airplanes these days have similar chairs, where the main objective is to optimize space.

As such, this chair only requires a mere 4 inches of clearance from the wall. That’s absolutely insane considering most chairs require up to 2 feet clearance. Kudos to Osaki for this one!

3.93'' Clearance To Be Precise!
3.93” Clearance To Be Precise!

#4 Variable Shoulder Widths

The Osaki OS 4000LS has the ability to adjust shoulder widths to 3 different settings:

    • Level 1—Shoulder width is set to 9.85”. This is the widest setting. Recommended for anyone with broad shoulders and a large frame.
    • Level 2—Shoulder width is set to 8.66”. Recommended for most average builds.
    • Level 3—Shoulder width is set to 7.09”. A much tighter fit than levels 1 & 2, level 3 is perfect for smaller body types.

This isn’t a common feature in all Osaki chairs. What it does provide is user flexibility for all body types (small, medium, and large).

Different Shoulder Widths According To Body Type!
Different Shoulder Widths According To Body Type!

#5 Spring Loaded Footrest Extension

Here’s another feature that further adds to the user flexibility discussed above. The foot ottoman in the OS 4000LS is spring loaded, so that it can be extended as required.

 If you’re 6 foot tall or more, this could potentially be a game changer! 

How does the foot rest extend? You can extend manually by changing a setting on the remote control, or simply push out with your legs to extend it that way. Either way is fine and will achieve the same result.

Kick Out To Extend!
Kick Out To Extend!

#6 Zero Gravity

Zero gravity seems to be a commonality in most Osaki chairs; the OS 4000LS  is no different. It recline to a zero gravity or “weightless position”, as some like to call it.

 Now you can feel like an astronaut every time you get a massage! 

Just Like The Astronauts!
Just Like The Astronauts!

There’s several benefits to sitting in a zero gravity position such as reduced spinal stress and reduced overall tension in the muscles. I won’t go into too much detail about it here, but this article talks about some of the key health benefits of sitting in a zero gravity position. Highly recommend you check it out!

#7 6 Different Auto Massage Modes

The Osaki OS 4000LS massage chair features a total of 6 automatic, preset massage modes:

    • Full Air—As the name suggests, this is a full on air compression massage! It can get pretty intense, so pick a mild intensity if you’re just starting out.
    • Stretch—Similar to the full air mode but with an emphasis on stretching the entire body.
    • Relax—Mostly targeted towards the back. A kneading, tapping combo that gets progressively intense!
    • Deep Tissue—Full body massage at a fairly high intensity.
    • Manual Air—Same as full air, but this time you choose what areas to focus on (shoulders, lower back, calves etc.).
    • Energy—A  full body, low intense tapping massage. Mild to say the least!


Osaki OS 4000LS Specifications

  • Osaki OS 4000LS Specs
  • Roller Type: L-Track
  • Roller Length: 42 Inches
  • Total Airbags: 24
  • Upright Dimensions: 47″H x 31″W x 63″D
  • Recline Dimensions: 34″H x 31″W x 78″D
  • Chair Material: Synthetic Leather
  • Recommended Height Range: 5’1 – 6’4 ft
  • Maximum Recommended Weight: 265 lbs
  • Power Usage: 200 Watts


Here’s What I Think About The Osaki OS 4000LS Massage Chair!

What I Like About It (Pros)

The Ability To Adjust Shoulder Width

Shoulder Width Can Be Adjusted Pretty Easily!

As discussed earlier, the OS 4000LS has 3 different shoulder width levels (see #4 above). Of all the awesome things this chair is capable of, this is probably my favorite. Why? Having a tight, snug shoulder fit isn’t only important for shoulder massage, it also ensures your back and neck are properly postured, so the rollers are able to effectively target and massage all areas!

Gotta Love That L-Track!
L-Track Makes A Huge Difference!

My biggest concern with most massage chairs is that they don’t pay enough attention to the lower extremities. Areas like the hamstrings, glutes, and calves are only subjected to compression massage, which in my opinion is not enough. I love L-Track chairs because they kinda address this concern to some extent. It would be nice if these rollers went all the way down to the calves. Can’t blame me for dreaming right!

One Of The Best Chairs For Tight Spaces!
Great For Small Rooms With Tight Spaces!

The OS 4000LS is in my opinion one of the best chairs for tight spaces, and this is mostly because of the space saving technology (see #3 above). The fact that you only need a 4 inch clearance from the wall is insane. This makes the 4000LS incredibly flexible as far as placement is concerned. In case you’re wondering, upright (47”H x 31”W x 63”D) and recline dimensions (34”H x 31”W x 78”D) aren’t all that bad either!

Extendable Foot Ottoman
Spring Loaded Footrest Can Be Extended As Required!

Not something that makes too big a difference for me since i’m a pretty small guy (5’4 ish and 120 lbs). However, if you’re 6 foot and above, the ability to extend the foot rest becomes vital. Again, this all comes down to user flexibility. A good massage chair has to be flexible in order to comfortably accommodate users of different heights and weights. That being said, the OS 4000LS is right up there with the best!

What I Don’t Like About It (Cons)

Compared To The Similarly Priced Pro Maxim, I Find It Lacking
I’ll talk about this in greater detail below when I compare both chairs, but for now i’ll say that the 4000LS doesn’t offer quite the same as the Pro Maxim. As an example, the 4000LS has a shorter roller track length; 42” in comparison to the 47” for the Pro Maxim. Both are Osaki chairs, and both are very close in price!



How Does It Compare To Other Massage Chairs?

The OS 4000LS is in many ways eerily identical to the Pro Maxim. Both have similar price points, both are fairly new Osaki models, and both can be considered mid to high end chairs. Before we look at some of the key differences between the two, here’s my complete review on the Pro Maxim. You may want to check it out!

  • Osaki OS 4000LS
  • 42''
    Roller Track
  • 24
  • 6
    Auto Programs
  • Spring Loaded
    Foot Ottoman
  • Slim LCD
    Remote Control
  • No
    Bluetooth Speakers
  • Osaki OS Pro Maxim
  • 47''
    Roller Track
  • 22
  • 12
    Auto Programs
  • Automatic
    Foot Ottoman
  • Touch Screen Tablet
    Remote Control
  • Yes
    Bluetooth Speakers

Difference #1: 42” Vs. 47” Roller Track

Pro Maxim has a larger track span than the OS 4000LS. To be specific, 5 inches more. Does this make a difference? Absolutely it does. It’s almost half a foot more of roller coverage!

Difference #2: Number Of Airbags

Pro Maxim has 22 airbags, whereas OS 4000LS has 24. Both chairs take advantage of Osaki’s next gen airbag technology. The objective with this technology is to optimize surface area coverage, and reduce overall number of airbags. In my opinion, the difference between airbags is so minor, that it won’t have an overall impact on performance. Irrespective, it’s definitely worth noting!

Difference #3: Bluetooth Speakers w/ LED Lighting

Speakers and lighting don’t make much of a difference to me, as I’m more concerned with a chair’s performance. That being said, you should know that the Pro Maxim comes with Bluetooth friendly speakers encased in blue LED lighting. The OS 4000LS doesn’t include this feature.

Difference #4: Auto Programs (12 Vs. 6)

Pro Maxim has 12 auto programs, 4000LS has 6. A huge difference, and definitely something that would influence what I decide to buy, especially considering how frequently I use auto modes. Another game changer!

Difference #5: Remote Controls (Tablet Vs. Slim LCD Remote)

What would you rather have: touch screen tablet or slim LCD remote? If you’re like me, you’ll pick the tablet any day. It’s a no brainer, really. Pro Maxim comes with a touch screen tablet to control and operate the chair; 4000LS uses a slim LCD remote.

Difference #6: Automatic Vs. Spring Loaded Foot Rest

Pro Maxim has an automatic foot rest which extends out and holds its position. In contrast, OS 4000LS has a spring loaded foot rest that doesn’t adjust automatically. A small distinction that’s worth noting!


Million Dollar Question: What Should You Get?

If you’ve read this far, kudos!

We’ve talked about all the incredible features present in the Osaki OS 4000LS massage chair, but is it worth the money or should you go for Osaki’s Pro Maxim instead?

 Now remember, both of these chairs are at a very identical price point, so cost should not be a factor in your decision. 

That being said, both chairs are mid to high end, and both cost a premium. Provided the price meets your budget, you could choose either one, but here’s what I recommend:

 If it were me, I’d pick the Pro Maxim ten times over the OS 4000LS! 

The 6 differences listed above more than justify this decision. 12 auto modes, 47” roller track, and a touch screen tablet for a remote! Sorry but for an identical price, it makes 100% sense to go for the Pro Maxim. Nothing against the 4000LS, I think it’s still an awesome unit. If the price were considerably lower, my decision might be different!

You can check out the Pro Maxim on Massage Chair Deals by clicking the link below!


Osaki OS 4000CS Vs 4000LS: What’s The Difference?

Osaki OS 4000CS is pretty much the exact same chair as the 4000LS, with one major difference:

 4000LS has kneading foot rollers, and the 4000CS doesn’t. 

The Osaki OS 4000CS massage chair instead uses airbag compression to massage the feet. Do foot rollers make all that much of a difference? I certainly think so!

Air compression alone is not effective. You need to have a good mix of kneading, rolling, and compression to get the most out of massage. And let’s not forget how awesome foot rolling can feel!

If you have your mind set on either getting the Osaki OS 4000CS or 4000LS, I recommend the 4000LS. And if I were you, I wouldn’t even get the 4000 LS, I’d get the Pro Maxim!

Only One Difference Between The 4000CS & 4000LS!
Only One Difference Between The 4000CS & 4000LS!


Why You Should Buy From Massage Chair Deals!

Because I get a commission! Now that’s something you won’t hear most affiliate marketers say. Not me though, I am very passionate about my blog and the reviews I write (not saying that others aren’t!).

 In my mind, not disclosing the potential of earning commissions or incentives constitutes an incomplete review! 

If you choose to buy from Massage Chair Deals, I will earn an affiliate commission. Of course there are several other reasons to buy from them!

    • You Get Special Perks!—Enter in MAM5 for an extra 5% discount at checkout. If you end up buying a chair that costs $3000 for example, that’s $150 off! You win, I win!
    • You’re Guaranteed The Best Price—If it’s lower, Massage Chair Deals will price match and potentially beat!
    • No Hassle Shipping—Free curbside shipping for all massage chairs!
    • They Offer Financing At 0%—So you don’t have to pay the whole thing all at once!
    • And They’re Available 24/7 For Support—Through live chat and phone!

You can check out the 4000LS on massage chair deals by clicking the link below!


If you’re outside the US, you unfortunately have fewer options. Your best bet is to visit some of the local stores in your area. Costco for example has some good options! Do a quick google search and see what you find.


Here’s Some Videos You Should Check Out!

We’ve talked about pretty much everything the Osaki OS 4000LS has to offer. Even still, you should check out the videos below as they demonstrate some of the features in action, and also show how to assemble the chair! (all credit to Massage Chair Deals)

This first video talks about the main features of the Osaki OS 4000CS/LS massage chair. Remember, there is only one distinction between the OS 4000CS & LS as discussed earlier!

And this next one talks about how to use the remote control.

Here’s one that talks about how to assemble the foot ottoman.

And how to remove the side panel.


My Final Verdict On The Osaki OS 4000LS Massage Chair!

Here are the main takeaways from this review:

    • Osaki 4000CS & 4000LS are the same except for one major difference (4000CS doesn’t have kneading foot rollers).
    • When we compare the 4000LS with the Pro Maxim, there is a very clear winner!
    • 4000LS is still a very capable mid to high end chair that features state of the art L-Track and space saving technologies.

I know I’m repeating myself, but for those of you who quickly skimmed through the post:

 Do yourself a favor and Pick the Pro Maxim instead of the 4000LS! 

Once again, you can find my complete review of the Pro Maxim here.

Lastly, I hope you enjoyed reading and got some value out of this post. If you have any questions at all, please do not hesitate to reach out. You can either leave a comment, or send me an email (support@massagersandmore.com). If there’s a specific chair you’d like me to review next, definitely feel free to drop me a note. Last but not least, show your support by sharing on the socials!

Here’s 3 posts you may wanna check out:

Osaki OS 1000 Massage Chair Review

All You Need To Know About Electronic Pulse Massagers! (Recommendations Included)

A Quick Solution To Achy Neck & Shoulders!

Osaki OS 4000LS/CS images were used with permission from Massage Chair Deals & Osaki Massage Chair

About Eve

Just an average bloke intrigued by massage and its incredible benefits. Oh, did I mention I also own a massage chair? More on that in the blog posts!

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