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Old 04-06-2005, 09:34 AM
zafarhayatkhan zafarhayatkhan is offline
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Join Date: Apr 2003
Posts: 320
I agree with Kestas. I remember reading a report about testing mineral oil in New York Taxi cabs (severe driving condtions). They took the engines apart after 3000 and 6000 miles and did not find any appreciable differences in engine wear.

5W30 and 10W40 maybe more of a problem than 10W30. I recently switched to 10W30 Mobile 1 Synthetic, only because I have swithced from highway driving to city and wanted to keep the oil change intervals at 5000 miles.
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