So I'm pretty certain one of the recommended diff fluids for this car is Mobil1 75w/90 synthetic gear oil, but I've also read that 90 isn't heavy enough and people prefer 75w/140 of Mobil1 synthetic gear oil. Can anyone shed some light on this? Lots of threads and its very confusing as there are so many conflicting opinions.

Also, trans fluid...Honda MTF is the best , am I right?

 

I just changed my car's transmission and differential and i used Honda OEM fluids. No problems at all.

Dont wanna get jumbled up in the "number" game .. as long as it keeps my car running in good condition, im Cool

 

You will be fine on the street with the M1 90w.

 

What Honda diff fluid did you buy? I ask because in the early days of the S2000, Honda was putting in the CRV dual pump fluid which in turn was killing S2000 diffs. The only 90W GL-5 fluid Honda makes is a Marine fluid, which I don't think a dealer would carry.

I currently run 75W140 Amsoil Severe Gear. In my last S2000s, I ran LE1605 which is a great fluid. Never had any issues with it. And yes, IMO, Honda MTF is the best stuff for the transmission.

 

I also used 75w-90 Mobile 1 synthetic for the diff

 

Sweet thanks for info guys. I think for now ill go with the M1 90w. In later days I'll be stocking up on amsoil stuff. Just want to get fluids done before the cruise since I'll be putting quite a bit of miles on it that day.

 

To be honest, i dont know what was it. I just took my car to byung (S2_4SHOOR) at Jim Coleman Honda and he changed everything. I trust him with my car

 

I've used both the mobil 1 and the amsoil for street and autox use. Neither one made noise or gave me any issues, and my car has over 100k miles. I switched to Amsoil because BapGeon sells it along with the amsoil motor oil. For all I know Amsoil is snake oil and not worth the money, but my last blackstone report was really good. It said I could try for 12k miles OCI (up from 10), but I don't have the guts. I drive so little now that I just change the diff fluid at the beginning of AutoX season.

 

Does BG have the Severe Gear stuff? I called them a few months ago and they didn't have it, and said they couldn't get it.

 

I only use Amsoil and no issues. Diff fluid I can't say I know any thing about or ever noticed a difference. (changed mine again today)
Transmission fluid...again...I only use amsoil. I love the feel and it doesn't break down as fast as Honda (my opinion and my preference for the shifting feel, I like the buttery sensation)
Motor oil....yep...only Amsoil. I've done a lot of testing (through Blackstone) and always got better results with Amsoil so I stick with it.