S2000 Under The Hood S2000 Technical and Mechanical discussions.

Gearbox oil recommendation?

 
Old 05-07-2019, 12:44 PM
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Originally Posted by 231sea View Post
Dumb question: Is it better to change the transmission and gear oil while the fluid is warm? Like shortly after a drive?
yes you get more fluid out when it is warm compared to it being cold, particularly the diff fluid which can be quite thick. The difference might be minimal but that is the theory,.
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Old 05-07-2019, 05:11 PM
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Originally Posted by Slowcrash_101 View Post
Whatever fluid you use, change it frequently. Once a year minimum.
That is kind of a broad statement considering some only drive a couple thousand miles a year. I replace mine every second year with around 10000Kms or 6000Miles.
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Old 05-08-2019, 03:34 AM
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According to the idiot Honda engineers (what would they know?), but replace yours every few months -- at least once a year.

Maintenance Schedule for Normal Conditions:
Replace manual transmission fluid
Every 120,000miles (192,000 km) or every 6 years, whichever comes first.
-- Chuck
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Old 05-09-2019, 11:49 AM
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Originally Posted by Chuck S View Post
For grins I looked up the maintenance schedule for the gearbox. Had to use the 2005 owners manual 'cuz there's no schedule in my 2006 manual, it's all in the Maintenance Minder.

Replace manual transmission fluid. Every 120,000miles (192,000 km) or every 6 years, whichever comes first. Honda expects their MTF to last quite a while! Anyone run theirs that long? (Severe service would be half that.) I have no scientific data indicating my gearbox shifts better or even differently from whatever oil the prior owner had in it in 2014 to the Honda MTF I put in the next spring to the Royal Purple SyncroMax in there now. A lot of this stuff is perception -- we expect the gearbox to be smoother with an oil change. And since I just rolled the odometer over 60,000 I'm sure the oil change has met specs.

Just a line below it on the same page: Replace rear differential fluid. Every 30,000miles (48,000 km) or every 2 years, whichever comes first. The differential is the one to be concerned with as to wear. I'll be changing this next month along with the engine oil. Gearbox is a game time decision but since I'm under the car and oil is cheap...

-- Chuck
The last time I pulled out transmission fluid that old was my last 2005, which had ~123k miles when I got it. The transmission fluid looked like heavily used engine oil coming out; it didn't feel/smell like it, but the visual consistency was the same.

I've run both Honda and Amsoil MTF and I would say that Amsoil has a slight edge in feel over Honda, though I doubt most would feel a difference. As has been said, the newness of the oil makes a bigger difference in the feel of the shifting. Since I mostly drive autox and street, I normally change my transmission and differerntial oils once a year unless I am running multiple track events that year, in which case I change it after a couple of events.
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Old 05-12-2019, 03:49 PM
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If I recall correctly, Spoon recommends replacing the MTF with every engine oil change.. what do they know that Honda doesn't?
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Old 05-12-2019, 04:04 PM
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Originally Posted by fatjoe10 View Post
If I recall correctly, Spoon recommends replacing the MTF with every engine oil change.. what do they know that Honda doesn't?
Spoon is a racing company , changing fluid with every oil change sounds reasonable in a racing environment, not needed in daily driving. Tranny fluid shears (becomes less viscous) with each mile of driving due to the meshing action of gears, so in a racing environment changing it more frequently makes sense - high heat and shearing fluid makes fluid even thinner than you want to risk.
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Old 05-12-2019, 11:10 PM
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Originally Posted by fatjoe10 View Post
If I recall correctly, Spoon recommends replacing the MTF with every engine oil change.. what do they know that Honda doesn't?
Ichishima-san did say in a Best MOTORing video that trans fluid should be changed more often than most people do because the engine oil gets changed out frequently so that's covered but the trans sometimes gets neglected. He definitely knows what he's talking about. He also said in the same show that you should never use engine flush.

Then again everyone's mileage differs quite literally. I made sure to change all my car's fluids before the last track day I entered for peace of mind, added protection and performance. As zero said, in a strictly racing environment such as that of Spoon's S2000 builds it would be reasonable and desirable to change the trans fluid at every oil change which for them could be after every race (depending on conditions, length/laps, etc). I intend to change my trans and diff fluids at shorter intervals than recommended by Honda.
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