Quote:
Originally Posted by Gregski
saw this Lucas Engine Break-In oil Zinc additive at AutoZone today while buying new belts, seems like they don't carry engine break in oil any more, neither does Oh'Reallys
The GM Start-up and Break-in Procedures, Specifications 19210008 only say use 10w30 motor oil (non-synthetic) and nothing about Zinc
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That's because when GM made your engine the knuckle heads at the EPA didn't remove the zinc from our oil yet. You want something between 1000-1800ppm of zinc in your oil or you will wipe a cam very quickly. I simply run Rotella T6 diesel oil it has a naturally higher zinc content still at around 1100 and has been proven by third party hobbies the like us with oil analysis tests sent in to labs. It costs a little more then normal 5w30 but it sure beats trying to track down zinc additive and then trying to explain it to the kid behind the parts counter as you melt his brain trying to explain it to him.
Keep in mind though if this were a full rebuild you would want some straight 30 weight to help seat rings on first start up and to reduce initial bearing wear.
"Steps off soap box"