Quote:
quote:Originally posted by mlh
I called Mobil Oil several years ago to ask when should I switch to synthetic oil. Their answer 'The day you get the truck'. Lots of cars now come with synthetic in them. Their reasoning was why wear the engine out more than you need to before you switch.
Lynwood
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Correct. A lot, perhaps most, engine wear occurs when starting cold. Synthetic oil flows much better cold, especially below freezing than regular oil does. On top of that, synthetic oil will not create sludge like regular oil can. Waiting until 50K can be a mistake, as any sludge formed by the oil can be cut loose by the synthetic and plug an oil passage, or plug up the filter prematurely, causing it to go into bypass mode and quit filtering.
Newer engines, including diesels, are machined to much more exacting tolerances and do not require the break in engines of even 10 to 20 years ago.