| [GMCnet] What Oil Is Being Used [message #321809] |
Tue, 08 August 2017 16:00  |
Arthur Mansfield
Messages: 290
Registered: April 2010
Karma:
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Senior Member |
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I have always used 20/50 oil in my GMC. Cold the old pressure reads just under 50 psi. Warm it reads a little over 35 on hot days. If the out side temperature is not hot the oil pressure gets close to 40 psi. I have been afraid to go to lower viscosity oil. Today I had to go to three stores to find 20/50 oil. I was thinking of going to synthetic oil 15/40 in the future.
I add Liquid Moly to the oil. I have used the Moly since the late 50’s.
Art
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