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churchx · 06-02-2020, 01:46 AM

Well, one thing is single-out viscosity parameters at temps, for gearbox oil also it's frictional parameters matter for synchros to engage well. While true, manual of ours states should be GL-4 75W90, it's not as if all the rest are unusable. For engine also after all not just one 0W-20 possible, but manual mentions also 5W-30. And some do fill different, for a bit higher pressure on tracked car.
At some point in past esotericperformance tried out multiple oils (#1 #2) and had best results with Redline MTL (+GB/TM bushings), my experience was similar (have tried OE oil (obviously), Motul 300 (of stock-ish 75W90), Verus's suggested Torco Synchrotech MTF, and Redline MTL 75W80. Best shifting feel was with later. Motul & MTF felt slightly better then OE, but MTL+bushings felt best).

06-02-2020, 01:46 AM	#12
churchx Senior Member Join Date: Mar 2015 Drives: 2014 GT86 Location: Latvia, Riga Posts: 4,336 Thanks: 698 Thanked 2,091 Times in 1,437 Posts Mentioned: 53 Post(s)	Well, one thing is single-out viscosity parameters at temps, for gearbox oil also it's frictional parameters matter for synchros to engage well. While true, manual of ours states should be GL-4 75W90, it's not as if all the rest are unusable. For engine also after all not just one 0W-20 possible, but manual mentions also 5W-30. And some do fill different, for a bit higher pressure on tracked car. At some point in past esotericperformance tried out multiple oils (#1 #2) and had best results with Redline MTL (+GB/TM bushings), my experience was similar (have tried OE oil (obviously), Motul 300 (of stock-ish 75W90), Verus's suggested Torco Synchrotech MTF, and Redline MTL 75W80. Best shifting feel was with later. Motul & MTF felt slightly better then OE, but MTL+bushings felt best).