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My two cents Posted by Ari [Email]  (#2847) [Profile/Gallery]
(more from Ari) on Thu, 2 Aug 2007 13:47:15
In Reply to: Slippery Issue..., Mike Lynch  [Profile/Gallery]
, Thu, 2 Aug 2007 11:08:23
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No doubt, modern engines are better, right from the factory.
I work for a company that makes jet engines. BIG jet engines. These don't exactly get thrown together - at $5 to $10 million a pop, a lot of care goes into assembly and component cleanliness. A typical commercial engine will run 20,000 hours between overhauls - as an example, assuming an average speed of 30 mph for your car (idling, stop-and-go, highway), 100K miles is a little over 3000 hours of engine operating time. This is the equivalent of going 600,000 miles on your engine before an overhaul. And the parts that wear out usually AREN'T oil lubed - it's the hot gases on the blades and vanes.
So these engines are built with very exacting tolerances, inspected every which way from Sunday as they are assembled, and tested at the factory.
What does this have to do with oil? Once an engine is delivered to a customer, it is known as a 'green' engine. For at least 200 hours of operation, it will be wearing in. During this time the chip detectors in the oil system are filling up with material. Many airlines ignore the more sensitive metal detectors for the first few hundred hours.
So if a super high tolerance, hand-assembled, inspected over and over (jet) engine produces debris in the oil when it is new, why should I assume that a mass-produced (car) engine won't? And what happens if the guy (or the robot) had a slightly bad day when he/she/it was assembling the engine?
I'll change the oil. Cheap insurance.
posted by 192.249....
, Thu, 2 Aug 2007 11:08:23, Thu, 2 Aug 2007 13:47:15 <-- Viewing This Message, Fri, 3 Aug 2007 05:19:57
, Sat, 4 Aug 2007 19:34:47
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