[dwcls]

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

 

[1stPny]

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,