Mobil 1 Gear Oil Okay? - Toyota FJ Cruiser Forum
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post #1 of 16 (permalink) Old 07-03-2019, 04:07 PM Thread Starter
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Mobil 1 Gear Oil Okay?

'07 6 Speed manual...Daily driver with occasional back road/dirt road forays. Is Mobil 1 75-90 gear oil okay?
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post #2 of 16 (permalink) Old 07-04-2019, 12:05 AM
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Re: Mobil 1 Gear Oil Okay?

OK for what?

Differentials?
Transfer case?
Transmission?
Door hinges?
Muffler bearings?
All the above?
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post #3 of 16 (permalink) Old 07-04-2019, 04:46 PM Thread Starter
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Re: Mobil 1 Gear Oil Okay?

I thought by saying gear oil most people would figure I meant the 4wd system. I guess I was wrong. So, yes, FRONT AND REAR DIFFERENTIALS, TRANNY (AS IN TRANSMISSION) TRANSFER CASE.
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post #4 of 16 (permalink) Old 07-04-2019, 04:56 PM
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Re: Mobil 1 Gear Oil Okay?

No it is not OK. Each one of the above take a different viscosity and the transmission takes tranny fluid.

I highly recommend you link up with a local member and do some strategery.
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post #5 of 16 (permalink) Old 07-04-2019, 06:04 PM
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Re: Mobil 1 Gear Oil Okay?

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datajockeys previously said: View Post
no it is not ok. Each one of the above take a different viscosity and the transmission takes tranny fluid.

I highly recommend you link up with a local member and do some strategery.
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post #6 of 16 (permalink) Old 07-06-2019, 10:17 AM
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Re: Mobil 1 Gear Oil Okay?

Front rear Diffs, transfer case yes. I would not use in the 6 manual . you want a GL4 rated oil. it is my understanding that some synthetic oils are not good for the synchro's over time most are GL5. I have been using LS 75- 90W Mobil One in my 2008 since it had 5000 miles on it. it now has 168000 miles. Front and rear diff, trans case. I live in Arizona in the heat also.

I had a 08 in the family with a 6MT and put synthetic in and the trans had a notchy feel. went back to a standard GL4 oil

Currently also have a 2013 TT 6MT in the family and thinking about trying Redline oil in the trans they make a GL4 .

MT-90 Safe for brass synchros, as it lacks the reactive sulfurs found in most GL-5 oils that cause damage

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post #7 of 16 (permalink) Old 07-06-2019, 12:53 PM
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MT-90 in mine. Works well. I just put severe gear in everything else, see how that goes. Do yourself a favor and pick up a transfer pump from harbor freight. Beats the hell out of the soap dispenser looking pump that you put on the bottle.
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post #8 of 16 (permalink) Old 07-07-2019, 09:11 PM
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Sorry, heavy shockproof. Looks like strawberry milk.
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post #9 of 16 (permalink) Old 07-08-2019, 07:03 AM
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Re: Mobil 1 Gear Oil Okay?

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JKFJ08 previously said: View Post
Front rear Diffs, transfer case yes. I would not use in the 6 manual . you want a GL4 rated oil. it is my understanding that some synthetic oils are not good for the synchro's over time most are GL5. I have been using LS 75- 90W Mobil One in my 2008 since it had 5000 miles on it. it now has 168000 miles. Front and rear diff, trans case. I live in Arizona in the heat also.

I had a 08 in the family with a 6MT and put synthetic in and the trans had a notchy feel. went back to a standard GL4 oil

Currently also have a 2013 TT 6MT in the family and thinking about trying Redline oil in the trans they make a GL4 .

MT-90 Safe for brass synchros, as it lacks the reactive sulfurs found in most GL-5 oils that cause damage


I agree with the funny feeling using GL5. I naturally thought the 5 would meet or exceed the requirements and it may. I did switch to Redline G4 and was surprised at how slick it changed gears.


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post #10 of 16 (permalink) Old 07-08-2019, 07:57 AM
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Re: Mobil 1 Gear Oil Okay?

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I thought by saying gear oil most people would figure I meant the 4wd system. I guess I was wrong. So, yes, FRONT AND REAR DIFFERENTIALS, TRANNY (AS IN TRANSMISSION) TRANSFER CASE.
To start with, why not review Toyota's recommendations for lubricants?

If you don't have the original Owner's Manual, you can download one for free from Toyota.com. Click the Owner's tab, then Resources, then Manuals & Warranties. Select your model & year, and download.

One oddity is that for the transfer case, Toyota recommends 75W-90 GL-5 for the manual transmission models, and GL-3 for the automatic transmission models. 75W-90 GL-4 or GL-5 for the manual transmission itself.

Manual trans diffs got straight 90wt GL-5.

Later models (from 2014 Owner's Manual) recommended Toyota Genuine Transfer Gear Oil LF 75W for the transfer case, with no GL equivalent specified, and 75W-85 GL-5 for the differentials.

The manual transmission lubricant changed to 75W-90 GL-4 only; the GL-5 recommendation was dropped.

Last edited by FJtest; 07-08-2019 at 12:15 PM.
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