Diff fluid
Joined: Aug 2012
Posts: 7,904
Likes: 3,435
From: Foothills East of Sacramento
Billman has stated he has seen perfect results using Mobil 1 75w-90.
https://www.mobil.com/en/lubricants/...ube-ls-75w-90/
Nifty Billman trick is to get another drain bolt and use it for the fill. One wrench size and you get another magnet in there.
https://www.mobil.com/en/lubricants/...ube-ls-75w-90/
Nifty Billman trick is to get another drain bolt and use it for the fill. One wrench size and you get another magnet in there.
Joined: Aug 2013
Posts: 4,151
Likes: 488
From: Sweden
Joined: Nov 2007
Posts: 8,841
Likes: 1,705
From: Illnoise. WAY downtown, jerky.
I recall the "genuine Honda" differential oil is intended for front wheel drive cars and is NOT GL5 hypoid gear oil which is the critical spec. Many to choose from and multigrades are fine.
The spec for SAE 90 gear oil changed after the S2000 went out of production. It was split into a pair of narrower viscosity bands. The top half of the viscosity was split off to SAE 110 (which did not exist prior to the split) so you can use 110 and still be in the original spec. The SAE 90 on the shelf today is the thinner half -- but also still in spec.
The partial bottle ofAmway Amsoil 75W-110 full synthetic in my garage leads me to believe that's what's in my differential which uses 0.78 quart. I know I used Lubrication Engineering previously but they're no longer GL5 certified. Big discussion a couple of years ago and the oil itself may not have changed just LE not jumping thru the certification hoop. Plenty of certified oils.
Maintenance schedule is two (2) years or 30,000 miles in normal service which makes it every other oil change for me the same as the oil filter.
-- Chuck
The spec for SAE 90 gear oil changed after the S2000 went out of production. It was split into a pair of narrower viscosity bands. The top half of the viscosity was split off to SAE 110 (which did not exist prior to the split) so you can use 110 and still be in the original spec. The SAE 90 on the shelf today is the thinner half -- but also still in spec.
The partial bottle of
Maintenance schedule is two (2) years or 30,000 miles in normal service which makes it every other oil change for me the same as the oil filter.
-- Chuck
Its for AWD transfer cases.
There's no "genuine honda diff oil" for FWD transmissions, as the diff is integrated into the trans.
You might be thinking of VTM4, Dual Pump or SH-AWD diff fluid which is similar to ATF. These are for AWD system rear diffs. Obviously not meant for the S2000.
Joined: Mar 2015
Posts: 1,370
Likes: 138
From: Cali
I've been using Mobil1 75w-140 synthetic (like many others).
But, I recently read somewhere, that using thick fluid really robs performance. I forgot where I read it... I think it was a presentation of the new 2022 GR86 iirc. Where they stated they shifted to using a lighter fluid (75w-90 iirc) for better performance.
I dunno how plausible/true this is, as I'm no lube-expert nor mechanical-engineer. But, if true, then Mobil1 75w-90 would probably be better than 140.
But, I recently read somewhere, that using thick fluid really robs performance. I forgot where I read it... I think it was a presentation of the new 2022 GR86 iirc. Where they stated they shifted to using a lighter fluid (75w-90 iirc) for better performance.
I dunno how plausible/true this is, as I'm no lube-expert nor mechanical-engineer. But, if true, then Mobil1 75w-90 would probably be better than 140.
Joined: Jun 2003
Posts: 575
Likes: 173
I've been using Mobil1 75w-140 synthetic (like many others).
But, I recently read somewhere, that using thick fluid really robs performance. I forgot where I read it... I think it was a presentation of the new 2022 GR86 iirc. Where they stated they shifted to using a lighter fluid (75w-90 iirc) for better performance.
I dunno how plausible/true this is, as I'm no lube-expert nor mechanical-engineer. But, if true, then Mobil1 75w-90 would probably be better than 140.
But, I recently read somewhere, that using thick fluid really robs performance. I forgot where I read it... I think it was a presentation of the new 2022 GR86 iirc. Where they stated they shifted to using a lighter fluid (75w-90 iirc) for better performance.
I dunno how plausible/true this is, as I'm no lube-expert nor mechanical-engineer. But, if true, then Mobil1 75w-90 would probably be better than 140.
Joined: Oct 2009
Posts: 847
Likes: 140
S2KPUDDYDAD aka PuddyMod, the apparent S2000 differential guru recommended either 75w110 or 75w140 in the stock differential post-standards changes. As well, the LSD seems to be sensitive to the gear oil breaking down and thinning out so 140 it was for me. I guess I don't really care about the minute loss of MPG and I don't drive the car in winter so...*shrug*
Joined: Nov 2007
Posts: 8,841
Likes: 1,705
From: Illnoise. WAY downtown, jerky.
S2KPUDDYDAD aka PuddyMod, the apparent S2000 differential guru recommended either 75w110 or 75w140 in the stock differential post-standards changes. As well, the LSD seems to be sensitive to the gear oil breaking down and thinning out so 140 it was for me. I guess I don't really care about the minute loss of MPG and I don't drive the car in winter so...*shrug*
75W140 is still thinner than SAE90 or 80W90 in winter.
Its retains viscosity as it heats up. Meaning less viscosity is LOST as it heats up.
Its a 75 weight oil to start.
But if you took a pot of 75W140 and another pot of straight 140 and heated them up to operating temp....they'd be similar viscosity.
KnowwhatImean?
Idk what is considered operating temp for gear oil. BEYOND (higher than) the rated temps, idk if the above holds true.
Last edited by B serious; Jan 6, 2022 at 08:49 AM.
Joined: Oct 2009
Posts: 847
Likes: 140
75W140 is still thinner than SAE90 or 80W90 in winter.
Its retains viscosity as it heats up. Meaning less viscosity is LOST as it heats up.
Its a 75 weight oil to start.
But if you took a pot of 75W140 and another pot of straight 140 and heated them up to operating temp....they'd be similar viscosity.
KnowwhatImean?
Idk what is considered operating temp for gear oil. BEYOND (higher than) the rated temps, idk if the above holds true.
Its retains viscosity as it heats up. Meaning less viscosity is LOST as it heats up.
Its a 75 weight oil to start.
But if you took a pot of 75W140 and another pot of straight 140 and heated them up to operating temp....they'd be similar viscosity.
KnowwhatImean?
Idk what is considered operating temp for gear oil. BEYOND (higher than) the rated temps, idk if the above holds true.