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I purchased a Getrag 240 from OGTS a couple of years ago and they sent a quart of mobil 1 and the instructions stated to use nothing but synthetic. I've change the fluid a few times not knowing the history of the trans and always used the Mobil 1. I began having problems with the 2nd gear synchro when cold and was told the mobil 1 does not have friction modifier for manual transmissions. I switched to Redline MT90 and the difference is night and day.
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