adallak Posted July 9, 2007 Report Share Posted July 9, 2007 This is what Chevelle said about rotella/delvac re: northstars... I would recommend the Rotella/Delvac/Delo oils for the 93-99 Northstars, personally. The latest ILSAC fuel economy oils are getting very low in ZDP concentration. Fine with the newest engines on the road but not so fine for a 93 Northstar. You can get the Rotella/Delvac/Delo oils in 10W30 for your engine but they are much harder to find. Check a truck stop or large equipment supplier. If all you can find is the 15W40 version of the Rotella/Delvac/Delo that is fine in the 93 Northstar. The oil is not that much thicker to hurt anything unless you live in the far north and need to cold start at -40. This is the whole thread link. Took me forever to find it... http://www.cadillacforums.com/forums/north...api-grades.html Thanks for the link. Looks like Chevelle now recommends the oil recommended for 4.* engines for early Northstars as well as they got older... The saddest thing in life is wasted talent Link to comment Share on other sites More sharing options...
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