2008 Precedent Rear Gear Oil

hymanykd · 06-27-2019, 11:34 PM

Doing a rear end oil change the weekend. What gear oil is acceptable? Manual calls up 75/90 Gl3 best I can find is a 75/90 gl4 or 5. Can this be used instead?

superpro56 · 06-28-2019, 06:49 AM

I read that GL5 can have adverse effects on brass, in our application that's probably meaningless. As far as I know GL4 replaced GL3 so I would go with that, but would shy away from GL5 just out of an abundance of caution.

Fairtax4me · 06-28-2019, 07:22 AM

I haven’t seen anything spec GL3 fluid since the early 90s and even then it was not that common. Seems odd they would spec that for the rear axle on these.

I use plain 80w-90 gl5 in all of mine. Typically whatever is cheapest at my local parts place.

75-90 is typically synthetic and among synthetic oils I know that Lucas 75w-90 does (or at least did several years ago) have additives that are harmful to brass. These transmissions do have brass synchronizers on the input shaft so I would stay away from anything Lucas branded for this application.

mckittrick.joe · 07-09-2019, 05:02 PM

Quote:

Originally Posted by superpro56

I read that GL5 can have adverse effects on brass, in our application that's probably meaningless. As far as I know GL4 replaced GL3 so I would go with that, but would shy away from GL5 just out of an abundance of caution.

I use gl4 red line. Cost $15 but save and good. Last for years!

Sent from my LML212VL using Tapatalk

superpro56 · 07-11-2019, 06:41 AM

I use Royal Purple for rear end grease, held up well in race cars. Figure it may be overkill, but its approved for GL5 or GL4 and is non-corrosive to soft yellow metals and synthetic to boot.

06-27-2019, 11:34 PM	#1
hymanykd Not Yet Wild Join Date: Jun 2019 Posts: 1	2008 Precedent Rear Gear Oil Doing a rear end oil change the weekend. What gear oil is acceptable? Manual calls up 75/90 Gl3 best I can find is a 75/90 gl4 or 5. Can this be used instead?
hymanykd Not Yet Wild Join Date: Jun 2019 Posts: 1

06-28-2019, 06:49 AM	#2
superpro56 Gone Wild Join Date: Sep 2018 Location: Michigan Posts: 291	Re: 2008 Precedent Rear Gear Oil I read that GL5 can have adverse effects on brass, in our application that's probably meaningless. As far as I know GL4 replaced GL3 so I would go with that, but would shy away from GL5 just out of an abundance of caution.

06-28-2019, 07:22 AM	#3
Fairtax4me Bonafide Nincompoop Join Date: Dec 2015 Location: Charlottesburg Va Posts: 8,987	Re: 2008 Precedent Rear Gear Oil I haven’t seen anything spec GL3 fluid since the early 90s and even then it was not that common. Seems odd they would spec that for the rear axle on these. I use plain 80w-90 gl5 in all of mine. Typically whatever is cheapest at my local parts place. 75-90 is typically synthetic and among synthetic oils I know that Lucas 75w-90 does (or at least did several years ago) have additives that are harmful to brass. These transmissions do have brass synchronizers on the input shaft so I would stay away from anything Lucas branded for this application.

07-11-2019, 06:41 AM	#5
superpro56 Gone Wild Join Date: Sep 2018 Location: Michigan Posts: 291	Re: 2008 Precedent Rear Gear Oil I use Royal Purple for rear end grease, held up well in race cars. Figure it may be overkill, but its approved for GL5 or GL4 and is non-corrosive to soft yellow metals and synthetic to boot.

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