Rear Differential Question

FL 4Motion · 12-22-2011, 09:33 PM

Quote:

Originally Posted by ImportConvert

Did that in my WS6. Burned up the diff in 5K miles.

Axles and wheel-bearings went out, and pinion-bearing spun. The bearing was blue/rainbow from heat. I will never use any weight but spec, or Royal Purple again, for this reason.

It may all be coincidence, but I'm not going to do it anymore.

yeah, I'm actually agonizing over whether to make the switch to the heavier weight gear oil or not, got the two bottles sitting in front of me right now on the counter.

I personally think you had problems mainly cause you used royal purple, that stuff is crap.

still...

arrgggg....

ImportConvert · 12-23-2011, 07:58 AM

Quote:

Originally Posted by FL 4Motion

yeah, I'm actually agonizing over whether to make the switch to the heavier weight gear oil or not, got the two bottles sitting in front of me right now on the counter.

I personally think you had problems mainly cause you used royal purple, that stuff is crap.

still...

arrgggg....

I agree the stuff is crap, but it wasn't in there long enough to break down/shear/etc.

Like I said, too many variables to blame any one thing, I just know I won't do it again.

ChrisSlicks · 12-23-2011, 08:38 AM

I would only go with the heavier weight if you are a serious track driver. The race track is the only place that would be able to get the 75-140 oil into it's proper operating range. The Viscous unit itself is sealed so the difference in oil weight has no effect on the limited slip.

SPOHN · 12-23-2011, 08:48 AM

Quote:

Originally Posted by ChrisSlicks

I would only go with the heavier weight if you are a serious track driver. The race track is the only place that would be able to get the 75-140 oil into it's proper operating range. The Viscous unit itself is sealed so the difference in oil weight has no effect on the limited slip.

So the Viscous is sealed? So what helps with the friction? Is there a oil or gel inside of it though? Can't remember.

ChrisSlicks · 12-23-2011, 08:57 AM

Quote:

Originally Posted by SPOHN

So the Viscous is sealed? So what helps with the friction? Is there a oil or gel inside of it though? Can't remember.

Most viscous units use some kind of silicon based oil blend.

There is nothing that can be done to improve the stock viscous unit other than regulating temperature. If it gets too hot then the viscous fluid gets too thin, it won't work as effectively. Get it really hot and the silicon will start breaking down and lose it's effectiveness permanently.

12-23-2011, 08:38 AM	#3 (permalink)
ChrisSlicks A True Z Fanatic Join Date: Mar 2009 Location: North East Posts: 6,203 Drives: 09 370Z Sport M6 Rep Power: 654	I would only go with the heavier weight if you are a serious track driver. The race track is the only place that would be able to get the 75-140 oil into it's proper operating range. The Viscous unit itself is sealed so the difference in oil weight has no effect on the limited slip. __________________ Hotchkis ARB \| Stillen CAI \| Art Pipes \| Berk CBE \| Stillen AP Racing Brakes \| AE Performance Oil Cooler \| BC Racing ER Coilovers \| Doran Control Arms

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