Posted by Jerry/MT on November 26, 2014 at 11:28:39 from (206.183.116.146):
In Reply to: OT--gasoline engines posted by Jiles on November 25, 2014 at 20:34:40:
It"s not only oils that have improved. Manufacturing capability, machining processes, materials , controls and sensors, etc have a lot to do with the durability of the modern spark ignition engines. ironically a lot of todays applied technology was formulated in the early 1920"s but materials, processes, and machining plus economics did not make it feasible.
We have 1991 Toyota pickup with ~260,000 miles on it they we use daily that has never had the head off. It would be unheard of to get that type durability 50 years ago from a production automobile engine.
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