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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