Cannot find conventional 75w90 gl4 gear oil. Any suggestions?
Problem finding conventional 75w90 gl4 gear oil
- Thread starter NewMex
- Start date
80w is allot thicker, so trying to find the 75w. Thanks
Why does it need to be conventional? Synthetic isn't more slippery and problematic regarding the blocker rings/synchros if that's your concern.
Torco rgo 75 w90 order it on Amazon
I do realize the need for GL4 in a manual transmission as GL5 gear oils are too slippery for fast gear changes. Even the yellow metal safe GL5 gear oils suck in a manual.
The No Auto Parts Available store by me usually carries it.,,,,
75w-90 is synthetic and 80w-90 is conventional.
I am topping off a differential that has conventional in it
Torco 75w90 is synthetic
Again 80w-90 is what you are looking for.
Why API GL-4 in a differential? Most would suggest using a GL-5 instead.
Miscibility of conventional gear oils with synthetics shouldn't be an issue.
If you insist using a GL-4 rated gear I'd suggest Castrol Syntrans Multivehicle
75W-90 GL-4 if you can obtain it. Not conventional, but excellent.
According to SDS 15.1 cSt @ 100°C, PAO 30-75 % (likely above 50 %), VI195,
pourpoint -54°C (-51°C according to PI). Ford and MB approvals.
No idea if you persist it NEEDS to be conventional, I'd say you're safe using
80W-90 though. That said, I'd always change the complete fill instead of just
topping up.
MolaKule
Staff member
What vehicle or machinery is this?
- Joined
- Dec 30, 2006
- Messages
- 29,558
Yep, you'll get gear clash. Dedicated standard tranny lubes have chemistry that's designed for synchronized trannies. Redline MT-90 for the win!!
- Joined
- Dec 30, 2006
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If it's going in a diff and you don't need the adds for synchronizers, I think Redline Shockproof is GL-4 rated for diffs and non-synched gear boxes. I'm not totally sure on this though.
If the diff isn't one of those special cases where a gl-4 lube is actually needed in a diff then Valvoline still makes conventional 75W-90
Amazon.com: Valvoline High Performance SAE 75W-90 Gear Oil 1 QT: Automotive
Buy Valvoline High Performance SAE 75W-90 Gear Oil 1 QT: Automotive - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
www.amazon.com
Here are several options that are either conventional or gl4...you may not be able to find one with both. In the past I used a yellow-metal-safe gl5 for this type of application.
Amazon.com: VP Racing Fuels Hi Performance Classic GL-4 Gear Oil, Quart SAE 80W-90 : Automotive
Buy VP Racing Fuels Hi Performance Classic GL-4 Gear Oil, Quart SAE 80W-90: Gear Oils - Amazon.com ✓ FREE DELIVERY possible on eligible purchases
www.amazon.com
If you're already in for the penny on getting under the car to top off the fluid, might as well be in for the pound and change the fluid to a synthetic 75w-90 and reseal the cover so you don't keep leaking fluid.
You're too hung up on the numbers VS. how those numbers relate to performance. Like has been mentioned already - 80w90 is what you need. Or 75w90 synthetic works as well or better, and is fully compatible with any conventional.
P.S. GL4 vs GL5 is where I am cautious about mixing, in certain applications.
