89 c4 oil

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Decatur AL USA
Never saw any reason for anything beyond standard 5W-30 or 10W-30 M1 in a street driven Roller Cam L98. SuperTech or Amazon Synthetic has the correct approvals if you don't want to deal with the M1 Rebate. You can make a case for 15W-50 if you are pushing 300F Oil Temps at Open Track Events.
 
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San Rafael, CA
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Originally Posted by Gene K
Never saw any reason for anything beyond standard 5W-30 or 10W-30 M1 in a street driven Roller Cam L98. SuperTech or Amazon Synthetic has the correct approvals if you don't want to deal with the M1 Rebate. You can make a case for 15W-50 if you are pushing 300F Oil Temps at Open Track Events.
Hmm, according to the dash the hot oil psi at idle is like 9psi, hence I was thinking a 40wt.
 
Messages
4,026
Location
Decatur AL USA
The stock sender on my '88 showed about 15 psi at idle on a hot day. Aftermarket senders are notorious for reading lower than stock. I suspect the pressure isn't really low but if 5W-40 makes you feel better it's not really going to hurt it.
 
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