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What Synthetic Oil weight to use?

769 Views 1 Reply 2 Participants Last post by  1stPny
I ahve a '91 5.0l with 150k+ miles on it.

What synthetic oil should I use (never used it before) and what weight?

side note: I need to add about 1 quart of oil every two months or so... is it worth switching to synthetic on this old of an engine especially when it has a non-visible leak/consumption (no white/blue smoke... only black :) )?

Thanks
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I run a 10 w 40 FULL SYNTHETIC on my 221,000 mile + motor. ORGINAL no rebuild etc.

I drag race very frequently. STOCK TB-OIL pan and run low 8's all motor in the 1/8th mile.


Just let your car warm up in the cooler mornings. That will help your motor live longer. IE oil pump driveshaft. i had to replace mine already. At the 218,606.6 mile mark,
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