I've owned several of GM's 60 degree V6's. They're great little engines.
Never had the often reported and seldom seen intake manifold coolant leak either.
Regarding oil: Just my
IMHO the gas mileage difference between 5W20 and 5W30 can fit comfortably underneath a persons fingernail. A percent or two at best. IMHO the 5W30 will protect much better under high temp high load conditions.
I recommend to change the oil often for awhile with dino 5W30 to clean out any possible sludge deposits. Maybe a little MMO during the last 500 miles of the OCI. After you are satisfied that it is clean enough inside; a "synthetic" may be in order based on your preference and budget.
Good luck Sir.
Rickey.
Never had the often reported and seldom seen intake manifold coolant leak either.
Regarding oil: Just my
IMHO the gas mileage difference between 5W20 and 5W30 can fit comfortably underneath a persons fingernail. A percent or two at best. IMHO the 5W30 will protect much better under high temp high load conditions.
I recommend to change the oil often for awhile with dino 5W30 to clean out any possible sludge deposits. Maybe a little MMO during the last 500 miles of the OCI. After you are satisfied that it is clean enough inside; a "synthetic" may be in order based on your preference and budget.
Good luck Sir.
Rickey.