trans and diff question?

[hayabusa1285]

is it safe to use a 70W in both the trans and diff?

[bimdub]

I would think NOT.......

probably way too heavy for the transmission and most likely too light for the diff.....

IIRC 75-90 synthetic GL5 is ok in the diff......90 hypoid gear oil GL5 or GL6 is the recomendation

the transmission is Honda MTF.....but the owners manual says you can use 10w30 or 10w40 as a temporary replacement.....

so yeah,,,,,,70w would probably be really bad in either case.....

[thereur]

http://upload.wikimedia.org/wikipedia/commons/b/b7/Viscosity.gif

Yup, big difference in flow. Plus I think MTF has additives to make things shift smoothly.

[hayabusa1285]

what about royal purple max gear 75-140

[repiv]

Manual tranny fluid and differential fluid are two different formulations. Generally, you can't use the same fluid in both our casings. MTF is more like a motor oil (5W30) but with additional additives for manual transmission function. Our diff is a hypoid gear (ring and pinion) that undergoes way different stresses and thus, has different needs in terms of fluid compatibility. It requires a GL-5 SAE 90 hypoid gear oil, however, a multigrade like the Mobil 1 75W90 has worked well for us.
A GL-5 fluid has been known to eat away at the syncros in AP1's and you sure wouldn't consider putting in engine oil into your diff, would you? Or would you? :crazy:
Trying to use the same fluid for both is like trying to use laundry detergent in a dishwasher or vica versa.
Also keep in mind that the rating system (SAE xxW) is a different scale for engine oil, tranny fluid and gear lube.

[repiv]

what about royal purple max gear 75-140
This may be fine for the diff if it's a GL-5 fluid, but it's certainly not good for the tranny.
PS. There are way better fluids to put into a car than Royal Purple anything.

[hayabusa1285]

thanks for the help... i have already done this in my car but used all honda fluids, its my friend who bought the royal purple but ill make the suggestion to make consider using a mobile one product instead

[repiv]

i have already done this in my car but used all honda fluids
What exactly did you put into your S2000? The only Honda fluid to put into the S2000 tranny is Honda MTF and it is not a 70W oil. PLUS, there is NO Honda USA fluid for the S2000 diff. If they gave you VTM-4 Honda diff fluid, you will be needing to replace your diff soon. It can be destroyed in a matter of hours using this fluid. The only "Honda" diff fluid is from Honda Motorcycle division and it's a GL-5 SAE 90W Hypoid Gear Lube.

[desmo4]

In my opinion run Redline in everything,no confusion. 10w30 in the engine, MTL in the transmission, and 75-90 in the diff (with friction modifier)

Jonathan

[bimdub]

as often as this topic comes up....I am shocked that a member since 2007 and having over 1000 posts would not already be aware of this......

but either way.....go back and double check whatever you put in your car.....Repiv is very correct on this......

[SpitfireS]

The only "Honda" diff fluid is from Honda Motorcycle division and it's a GL-5 SAE 90W Hypoid Gear Lube.
IIRC its Honda Marine oil.
SAE 90 GL-5

[bimdub]

In my opinion run Redline in everything,no confusion. 10w30 in the engine, MTL in the transmission, and 75-90 in the diff (with friction modifier)

Jonathan

tell me again why the friction modifer? this is not normally used in a Torsen type Diff......I am familiar with the use of in my clutch pack diff...

[hayabusa1285]

What exactly did you put into your S2000? The only Honda fluid to put into the S2000 tranny is Honda MTF and it is not a 70W oil. PLUS, there is NO Honda USA fluid for the S2000 diff. If they gave you VTM-4 Honda diff fluid, you will be needing to replace your diff soon. It can be destroyed in a matter of hours using this fluid. The only "Honda" diff fluid is from Honda Motorcycle division and it's a GL-5 SAE 90W Hypoid Gear Lube.

sorry i guess i should have mentioned i did the tranny with Honda MTF. but im curious what does honda use to change the diff fluid than if you take it to them?

[repiv]

tell me again why the friction modifer? this is not normally used in a Torsen type Diff......I am familiar with the use of in my clutch pack diff...
No friction modifier is needed for a stock OEM S2000 diff. FM are only needed for those with clutch packs, like you said. The stock S2000 diff has no clutch packs. Although FMs don't do anything for our diffs, they don't do any harm either. They just serve no purpose.

sorry i guess i should have mentioned i did the tranny with Honda MTF. but im curious what does honda use to change the diff fluid than if you take it to them?
A knowledgeable Honda dealer will get the diff fluid from their motorcycle or marine division. They even have an internal memo that says so. This memo came about when a few dealers put in the VTM fluid and grenaded S2000 diffs. Some dealers will just go down to the nearest autoparts store and get an aftermarket fluid like Mobil 1. Here is that memo from many years ago. Some dealers still don't get it. This is the Canadian version but Honda USA should also have a similar memo:

http://inlinethumb06.webshots.com/41605/2638185390025981935S600x600Q85.jpg (http://good-times.webshots.com/photo/2638185390025981935tmptEU)

And Spitfire is correct. The marine product is equivalent to the motorcycle product, which is the same as the small engine equipment product.

PS. Where did the "70W" fluid come into this equation?

[desmo4]

tell me again why the friction modifer? this is not normally used in a Torsen type Diff......I am familiar with the use of in my clutch pack diff...

I have a Mugen LSD which has clutches and they will chatter when slowly going around corners without it.

Jonathan

[repiv]

I have a Mugen LSD which has clutches and they will chatter when slowly going around corners without it.

Jonathan

Jonathan, you really must start telling people about the non-OEM parts on your car. Simply saying that you use a product with friction modifier in a thread about stock parts is misleading and incongruous with what's being discussed. The uninformed, who don't know your car, need to know that some of the stuff you use on your car is inconsistent with what they should be using in theirs. Not unlike a few days ago when you talked about doing something on your car that is easy. Sure, you can reach the oil drain plug from above. You DON'T have the stock airbox. And like a year or so ago, when spoke of things that only applied to your car because you didn't have the stock ECU. These little anomolies are IMPORTANT and should be pointed out.