Most people don't drain it with the pan due to the labor involved with. The leftover oil will eventually dilute into your newer oil and through several oil changes, be filtered out again. With modern full synthetics anyways, they last longer than the typical 3k mile change cycle. Shouldn't give you any extra wear/tear.
My only question is if you happened to get your oil changed at Shop A. with oil 1, and then later on happened to go to Shop B. and because they don't carry oil 1, you get oil 2. Will the mixing of 2 different brands cause a problem...?
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Bonnie - Stage 2, Audio build coming this fall!
R.I.P. Abby 3/29/10 - 3/30/14
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