Quote:
Originally Posted by Triple Jim
That really gets to my point... I have a Vega engine that had something like 200,000 miles on the crank, running with dino oil, and the journals measured within new tolerance. It doesn't matter much what oil you use, as long as it's there in the right amount and kept clean.
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I wouldn't go that far when talking about cycle engines.
Oils have changed. A standard automotive oil (conventional or synthetic) is not a very good choice for a cycle engine or an older engine with solid (non-roller) lifters. The pressure at the contact areas are extreme and in certain conditions require special additives (Zinc and Phosphorus or "ZDDP") to prevent galling.
Current auto oils have reduced amounts of those additives to protect the emissions catalyst.
Diesel oils (conventional and synthetic) like Rotella and Delvac are not required to have lower levels, and have safe levels that are similar to most "cycle specific" oils.