Differential Fluids....

NickD · 04-09-03, 06:52 PM

Hey guys. I tried searching aroudn for this but didn't really find what I was looking for.

I want to change my diff fluid, the manual recommends 80W-140 gear oil.

Would the diff benefit from a synthetic gear oil, like redline or something?

When I searched no-one had any results on doing this, but the dates on those posts were august of '02. Has anyone else had any experience with synthetic gear oil for the diff?

Alexander · 04-09-03, 07:27 PM

Nick

I don't know about the benefits or not, but I'm running Redline MT-90 on my Differentials and Tranny for a while now, and it has been fine. You can try the MT-90, and I'm sure that you won't have any problems at all like me.

sleeprlegendcp · 04-09-03, 08:13 PM

I agree with Alexander. I got the MT-90 for my trans, then realized I could use it in my diff. I ended up getting some Valvoline Synthetic Gear Oil instead. If I ever need to change the diff again I am going to use RedLine. I would go for it. I havn't seen anyone say it can hurt like they do about synthetic oil in the engine.
Later!
Lee

NickD · 04-10-03, 11:30 AM

Using the Redline M/T 90, wouldn't that be too thin?

Does synthetic last longer as well in the diff?

Thanks for the info guys.

Alexander · 04-10-03, 04:53 PM

Nick, as far as I know, the MT90 is within spec of what our car differential and transmission oil requirements. Don't use MTL though, that would be too thin.

Looking from the results when I change my tranny and diff fluid last time, I think ANY oil can last forever inside. When I drain mine, with about 50k miles probably, it is still very clear and clean like new. Not much particulates inside too, well I try this by touching the oil and rubbing it between my fingers, so maybe micron sized particulates are there, but It is just too small for me to feel hehee............

Merlin the Wrench · 04-13-03, 07:55 PM

trans and diff oil is heavy and when churned for several years the paraffin (wax) seperates out like butter from cream. Replace it once a year. I have used Castrol GL5 80/90 or Pennzoil GL5 80/90 for years since my formua and production racing days. Don't use a GL6 unless you are running a limited slip w/ clutch pack.

04-09-03, 06:52 PM	#1 (permalink)
NickD Bk F*er Join Date: Jan 2002 Location: Lebanon, NJ Posts: 2,633 Car 1: 1991 Frost White L Sedan Car 2: 1999 BMW 328i 5speed iTrader: (0)	Differential Fluids.... Hey guys. I tried searching aroudn for this but didn't really find what I was looking for. I want to change my diff fluid, the manual recommends 80W-140 gear oil. Would the diff benefit from a synthetic gear oil, like redline or something? When I searched no-one had any results on doing this, but the dates on those posts were august of '02. Has anyone else had any experience with synthetic gear oil for the diff? __________________ 1991 Legend L Hybrid (gallery) 1989 Legend L 5speed (totaled) 1999 BMW 328i 5 speed http://demandred.dyndns.org/sig-small.jpg http://demandred.dyndns.org/bmw-small-sig.png

04-09-03, 08:13 PM	#3 (permalink)
sleeprlegendcp Registered User Join Date: Jan 2002 Location: . Posts: 10,099 Car 1: . iTrader: (0)	I agree with Alexander. I got the MT-90 for my trans, then realized I could use it in my diff. I ended up getting some Valvoline Synthetic Gear Oil instead. If I ever need to change the diff again I am going to use RedLine. I would go for it. I havn't seen anyone say it can hurt like they do about synthetic oil in the engine. Later! Lee __________________ National Acura Legend Meet 2008 - 4th of July - Chattanooga, TN - Click Here!

04-10-03, 11:30 AM	#4 (permalink)
NickD Bk F*er Join Date: Jan 2002 Location: Lebanon, NJ Posts: 2,633 Car 1: 1991 Frost White L Sedan Car 2: 1999 BMW 328i 5speed iTrader: (0)	Using the Redline M/T 90, wouldn't that be too thin? Does synthetic last longer as well in the diff? Thanks for the info guys. __________________ 1991 Legend L Hybrid (gallery) 1989 Legend L 5speed (totaled) 1999 BMW 328i 5 speed http://demandred.dyndns.org/sig-small.jpg http://demandred.dyndns.org/bmw-small-sig.png

04-13-03, 07:55 PM	#6 (permalink)
Merlin the Wrench Registered User Join Date: Jan 2003 Location: sacramento Posts: 863 Car 1: 1995 L sedan; past 1992 L sedan iTrader: (0)	trans and diff oil is heavy and when churned for several years the paraffin (wax) seperates out like butter from cream. Replace it once a year. I have used Castrol GL5 80/90 or Pennzoil GL5 80/90 for years since my formua and production racing days. Don't use a GL6 unless you are running a limited slip w/ clutch pack. __________________ Best Wishes Steve

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04-09-03, 07:27 PM	#2 (permalink)
Alexander Registered User Join Date: Feb 2002 Location: Cranston, RI Posts: 852 Car 1: 1993 Legend LS Coupe 6-speed and 1988 RX7 10th AE iTrader: (0)	Nick I don't know about the benefits or not, but I'm running Redline MT-90 on my Differentials and Tranny for a while now, and it has been fine. You can try the MT-90, and I'm sure that you won't have any problems at all like me.

04-10-03, 04:53 PM	#5 (permalink)
Alexander Registered User Join Date: Feb 2002 Location: Cranston, RI Posts: 852 Car 1: 1993 Legend LS Coupe 6-speed and 1988 RX7 10th AE iTrader: (0)	Nick, as far as I know, the MT90 is within spec of what our car differential and transmission oil requirements. Don't use MTL though, that would be too thin. Looking from the results when I change my tranny and diff fluid last time, I think ANY oil can last forever inside. When I drain mine, with about 50k miles probably, it is still very clear and clean like new. Not much particulates inside too, well I try this by touching the oil and rubbing it between my fingers, so maybe micron sized particulates are there, but It is just too small for me to feel hehee............

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