Full Access Member
- Apr 13, 2021
- Reaction score
- LFOD, New Hampshire
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Dexron VI IS NOT a pao synthetic. Its what is referred to as a Group III base stock, PAO is Group IVDexron-VI is such a tough spec to meet, I think it can only be met with high grade PAO synthetic oil in high quantity.
GM Dexron HP
"The base stock of old fluid (19355656) has the ability to attract low levels of moisture, which can cause degradation of the coefficient of friction of the fluid. The new fluid (19417577) has a new GTL (Gas to Liquid) base stock that is able to tolerate more moisture. Shuddering transmissions and torque converters have been recovered with the new fluid. New transmission fluid tests have been developed due this issue to prevent it from occurring with new transmission fluids."
The concern of using an ATF in place of a flush is chemical incompatibility with engine seal material. ATF has been known to over swell engine seals and cause leaks and premature failure.Don't some people put ATF in the engine crankcase to 'flush' it clean?
Never said that makes sense, just sayin' that I've heard that some people do it.
Manual Transmission fluid part number 88861800 U.S. (88861801 Canada) is currently available through GMSPO. Current and past model vehicles listed above with either a manual transmission or transfer case that REQUIRE Dexron III should use the above listed manual transmission fluid. This fluid is a direct replacement for Dexron III in manual transmissions and transfer cases. DO NOT use Dexron VI in place of the manual transmission fluid in any manual transmissions or transfer cases as a failure may result.
"If fluid part number 88861800 U.S. (88861801 Canada) is unavailable when servicing a manual transmission or transfer case, Dexron III can be used in it's place. DO NOT use Dexron VI in place of the manual transmission fluid in any manual transmissions or transfer cases as a failure may result"
Is Dexron HP 'backwards' compatible with Dexron 6J?The highest grade Dexron is Dexron HP in the 8L90E
Used to use ATF in five speed manuals as listed in owners manuals. The Tremec TKO was originally spec'd to use ATF. I wonder if the new stuff would be better, or worse, in high pressure gear sliding contact and good syncro action?