Quote:
Originally Posted by apecush
do you have any data to support that?
D4 atf is 7.5 cst at 100C
SAE specifies the viscosity range of 75W80 is 4.1 - 11 cst at 100c. What is the viscosity of the BMW fluid?
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The OEM fluid is Pentosin Titan Sintofluid 75w80, and the specs are as follows:
KV @ 40C = 49.8
KV @ 100C = 9.4
I may have misspoken about it being 50% thinner, but it is about 25-30% thinner. Not saying it won't work, but that's pretty far from the OEM fluid for me to call it completely safe. Red Line's 75w80 is far more appealing.
To be clear, BMW does NOT spec "[any] 75w80 GL4", but their fluid happens to be that.