5w30 over 5w20

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Originally Posted By: toyotaguy
But have you guys ever bought the Mobil 1 5w40 turbo diesel truck oil. Man, that stuff on the finger really clings to it. hard to wash off. I bet that has great film strength.


That must be the … ASTM D 9951 Finger Cling Test … ya, M1 5W-40 does well in that test.
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I use the … ASTM D 9952 Pull the Dipstick out Finger Rub Slide Test … to check the condition of my oil all the time.
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No... We park a car in the Yukon for a week in the dead of winter at -50oC temperatures and then try to start it. If it starts then it passes the test.

This is assuming the driver doesn't freeze to the seat!
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We call it the CanadaEh-Test-101!
 
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