Never heard this before. Your friend might use oil of

來源: khyang86 於 2010-09-23 20:15:45 [] [舊帖] [給我悄悄話] 閱讀數 : (193 bytes)

wrong grade rating. For example, should use 5W-20 but used 10W-40. But there is very little difference between oil of $2 and oil of $6 in regular driving, especially for the first 2,000 miles.

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