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I have RP Synchromax on my M6 tranny, and am very happy with it; much better than stock, especially when cold. But am sure all other synthetics out there should be equally good. I bought RP because it was available at the local PepBoys.
On the differential the overwhelming majority on the 'other' board (recommended by a diff shop) uses Torco RGO 85/140, and I dumped my almost new RP 75/140 for the Torco, with 2 oz of FM Type-F, even though it's dino and not synthetic. With only 4K miles a year or so, will replace both every year.
But probably the most urgent fluid to change is brake/clutch fluid. Brake fluid was black, but clutch was unbelievably filthy, with all kinds of crap inside the reservoir, and the slave. You need to do a FULL BLEED, not just suck the little reservoir. Same with the brakes.
Next is my coolant, and maybe the power steering (w/Mobil1). And will change engine oil to M1 0/40 this time to see if my ticking subsides a little. Good luck.
JC
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