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The M715 LO denotes OE30 (MIL-L-45199) which was API service CD?
What I posted about put better oil in it is from a bit of an ongoing study of mine.
This is only a suggestion.
You can just put Rotella T (or your favorite flavor) in it and meet MIL-L-2104D, and later specifications
and get all...
25psig at 2000 RPM specification
bcowanwheels sent a good caution note
SOHC with cam lobes doing double duty with OE-30 oil. Put a good gauge on it, get the readings, put better oil in it, change the filter and measure it again. Can't hurt.
3-8. Oil. Pressure Check (In Vehicle).a. The oil...