Quote:
Originally Posted by Unspec
Quote:
Originally Posted by Surly73
Well - like I said, they changed specifications through all of these different fluids settling on G2. I don't know why it's different, but everyone who opens their diffs say that the front diff fluid seems extra "used up", darkened and burnt.
For, let's say, E39 automatics. They have a BMW specified fluid, which it turns out is Esso LT71141. Lots of really good ATFs says they are intended for LT71141 applications and fully compatible. I put Amsoil ATF (which listed LT71141 as an intended application) in an E39 and it worked better than new. In this case BMW didn't specify a whole series of fluids which they superceded and made obsolete, leading to a TIS bulletin listing only three exceptions to G2 for front diffs, with no clear indication what was different.
I find almost no manufacturers who said they were equivalent to G1 or G2. Amsoil and other web sites had NO driveline fluid recommendations for the F10 (and Amsoil makes a lot of fluids).
As I explained in another thread - I just went with real G2. Who knows how many years before I have to spend another $80 on fluid (or whatever).
Mine took 500mL plus a single pump from my bottle pump. If I had not opened the second bottle I could have returned it.  |
The change in 7/2011 is that BMW went from a 75w90 to a 75w85 to boost mileage by like 0.1% lol. People are probably reporting that the G2 is extra chewed up because it's just a thinner fluid. It's a 75W85 GL-5 oil, so the Red Line GL-5 is actually a valid replacement.
The rear diff is G1, which is just a GL-4 oil. They probably went GL-4 because there weren't many yellow metal safe oils at the time, but these days 99% of modern Gl-5 oils are safe for yellow metals (in fact, some corrode LESS than Gl-4).
The 7/2011 change actually PERFECTLY lines up with the political happenings of the day:
"On July 29, 2011, President Obama announced an agreement with thirteen large automakers to increase fuel economy to 54.5 miles per gallon for cars and light-duty trucks by model year 2025. He was joined by Ford, GM, Chrysler, BMW, Honda, Hyundai, Jaguar/Land Rover, Kia, Mazda, Mitsubishi, Nissan, Toyota, and Volvo—which together account for over 90% of all vehicles sold in the United States—as well as the United Auto Workers (UAW), and the State of California, who were all participants in the deal" |
What oil are you going to use in the rear diff? Probably going to get this done this week