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89 C4 engine oil

Ovie

New member
Joined
Jan 1, 2019
Messages
1
Location
Ireland
Hi guys, I'm looking for some advice. Im currently running an 89 c4 with 111,000 miles. Im just about to change the oil. The last owner was running Mobil 1 10w 40 but I've noticed a little oil loss although temps and pressures are good. Im guessing the engine has a little wear and the seals are not as tight as they once were. I am in europe where the temp range is usually 35 to 80F. Would It be better to stick with the 10w 40 and add an oil additive like Lucas oil stabiliser or move to a classic car oil in 15w50 or 20w50. Also can anyone recommend a brand that's available in Europe.
 

GWinter

Well-known member
Joined
Oct 2, 2005
Messages
52
Location
NW Iowa
Corvette
1990 conv. 6sp
Others may have diff views on this,but I would stay with the 10W40 . I believe the manual calls for 5w30 I run 10w30 in my 90 with 106,000 miles . Summer temps range from 50 to close to 100 and I have never been worried about it. If oil pressure is good I would not change. Mobil1 synthetic does not thin nearly as much as regular oil.
 

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