75w-90 is totally fine, lots of folks use the Mobil 1 stuff for the diff and t-case
Pros: totally fine
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I replaced the gear oil in my 99 6-speed w/LSD using Mobil Delvac 75w90 about 300 miles ago and it seems notchier than before, especially before it’s warmed up.
Cons: notchier than before
Vehicle:
Porsche 911
Mileage: 300 km
Nici Mobilu nu mai e ce a fost...
Am pus in cutie 75w90 prin 2019 a mers ceas.
Anul trecut cand am facut distributia zic hai sa schimb toate lichidele daca tot fac o treaba.
Am luat acelasi mobil 75w90 pentru cutie.
Dupa 2000 de km incepe sa se auda zgomot de rulment in cutie pe treptele pare, mai ales a4a.
Am zis hai sa schimb uleiu' inainte sa schimb cutia si sa ii pun original.
Cand am dat jos Mobil 1 ala din cutie zici ca am scos mal de pe fundul lacului. Tulbure, imputit si gros.
Cons: tulbure, imputit si gros
Mileage: 2000 km
Running Mobil Delvac 1 synthetic 75W-90 in the MT trans and Valvoline 75W-140 in the rear diff. No issues
Pros: no issues
I've been using Mobil 1's 75w-90 in both my 07 V8 4Runner, and my 06 V6 Tacoma TRD Off Road, for both differentials and the transfer case. Between the two vehicles, there's pretty close to 160,000K miles of travel on that fluid (Changed every 50K on full synthetic) and it's been completely fine. Zero issues with slipping or any metal particles.
Pros: completely fine, zero issues
Vehicle:
Toyota 4runner
Mileage: 160000 km
This is in fact normal when moving from a dual-mass to single mass flywheel. It isn't a evidence of issues but rather the result of using a flywheel that is no longer dampened. Use of a thicker gear oil can reduce this noise a bit (but will not cause it to go away completly) and as such isn't a true remedy. I have personally tried using mobil 1 75w90 gear oil in the past and it does help a bit.
Pros: thicker gear oil helps
Cons: noise not completely gone
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What we know about Mobil gear oil
The brand is registered in Finland.
In March 2026, PartReview does not yet have a formed opinion of Mobil gear oil. This part is not in the ranking due to insufficient reviews. You can help by adding a review for Mobil gear oil.
Currently there are 6 reviews and 19 votes. Average rating — 3.5 out of 5. Vote balance: 11 up, 8 down.
Users also evaluated the qualities of Mobil gear oil:
- Noise - howl or rumble from the diff area is easy to hear - rated ambivalently. 3.2 points out of 5.
- Smell - strong sulfur-like odor after a drive can indicate leaks - rated ambivalently. 3 points out of 5.
- Leaks - wet gear oil at the housing or on the driveway is obvious - rated positively. 5 points out of 5.
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