quote:Not trying to tell you what to do, but... I've had the "pleasure" of dealing with all sorts of GM engines... 2.8L V6 3.0L I4 4.3L V6 5.0L V8 5.7L/383 V8 7.4L V8 Some of these were marine engines, though most have been pickup engines...a 40 weight oil does wonders for consumption! Not really a big fan of 10w-40, but when one of these engines starts consuming oil, I'll take a 5w-40 or 15w-40 "diesel oil" in 'em anyday of the week!
Originally posted by wtd: 98 Grand Prix-- 41 ounces of 10W-30 Mobil 1 in 5,000 miles. 98 Chevy truck 5.7L-- 24 ounces of 10W-30 Mobil 1 in 3,000 miles. Currently using 5W-30 Chevron Supreme and level has only slightly gone down in 1,800 miles. Better than Mobil 1 so far. Wayne