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Ventmaster · 01-08-2025, 04:18 PM

OK- think I answered my own question about oil names: RP sells "Max Gear Oil" and "Max ATF". I'm still concerned about the low viscosity. OE gear oil in these cars has a top viscosity rating of 80w when warm if I remember correctly. I'm sure the AC Delco gear oil called for in the diff is 75w90 with LSD additive (that's "limited slip friction modifier" for the other old hippies out there-lol).
So, no one's blown up their trans with this Synchromax MTF? All the retailers I'm looking at say that it is for manual transmission cars if the manufacturer specifies it can use "automotive" transmission fluid. Hmmm... Does that mean ATF like my old 3rd gen car?
Last update- MY OE gear oil for the manual trans is a 75w-90. RP Synchromax has a viscosity of 10. Despite the front label saying it is a "High Performance Manual Transmission Fluid", but the fine print sez it is "recommended for manual transmissions that specify an automatic transmission fluid or motor oil".
Some retailers use "automotive" instead of automatic trans fluid and describe the viscosity as "low (relative to motor oils)" in order to mislead I believe.

01-08-2025, 04:18 PM	#16
Ventmaster Drives: 2017 1SS 6spd Join Date: Jan 2011 Location: Utah Posts: 3,022	OK- think I answered my own question about oil names: RP sells "Max Gear Oil" and "Max ATF". I'm still concerned about the low viscosity. OE gear oil in these cars has a top viscosity rating of 80w when warm if I remember correctly. I'm sure the AC Delco gear oil called for in the diff is 75w90 with LSD additive (that's "limited slip friction modifier" for the other old hippies out there-lol). So, no one's blown up their trans with this Synchromax MTF? All the retailers I'm looking at say that it is for manual transmission cars if the manufacturer specifies it can use "automotive" transmission fluid. Hmmm... Does that mean ATF like my old 3rd gen car? Last update- MY OE gear oil for the manual trans is a 75w-90. RP Synchromax has a viscosity of 10. Despite the front label saying it is a "High Performance Manual Transmission Fluid", but the fine print sez it is "recommended for manual transmissions that specify an automatic transmission fluid or motor oil". Some retailers use "automotive" instead of automatic trans fluid and describe the viscosity as "low (relative to motor oils)" in order to mislead I believe. Last edited by Ventmaster; 01-09-2025 at 03:29 PM.