Posted by jdemaris on November 26, 2014 at 04:41:42 from (70.194.9.125):
In Reply to: OT--gasoline engines posted by Jiles on November 25, 2014 at 20:34:40:
The oil is not "much better." Just different. Common automotive engine oil switched from the excellent anti-wear additive ZDDP to other additives to preserve the integrity of emissions systems components.
Many newer oils have less metal-wear protection then some oils did 50 years ago.
The plain fact is - modern machining methods have much approved for mass produced engines. More durable materials are used in high stress areas like piston rings, valves, valve guides, etc. Computer-controlled fuel injection keeps engine combustion chambers MUCH cleaner. Computer chips also avoid running with timing too advanced and some even will be controlling valve-timing.
The answer to your question - in my opinion is - an old engine would not last any longer and might even die sooner with "new" oil.
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