Oldsmobile Intrigue 1999

For those engines, the GM word is that 10W30 is preferred at temperatures above 0 degrees F (-18 degrees C), however 5W30 is acceptable at temperatures of 16 degrees C (60 degrees F) and colder.

What climate and time of year? For winter months in cold climates a 5W-x oil is probably a good idea, but not for summer months in hot climates.

John

My owners manual recommends 10 w 30 all year - however 5 w 30 can be used when the temperatures will be below 50 degrees.

========= Harryface =========

1991 Pontiac Bonneville LE 3800 V6 ( C ), Black/Slate Grey _~_~_~_~277, 300 miles_~_~_ ~_~_

Actually, throughout the owner's manual it always stresses that even though 10W30 is OK for warmer climates, 5W30 is better in any condition. So much so that the oil cap is marked "Use 5W30", or something like that.