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      01-13-2013, 06:52 PM   #28
baba louey
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Drives: 2012 M3 coupe
Join Date: Aug 2012
Location: calgary

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I've been using synthetics since about 1975 (Amsoils was one of the first auto syns). I have consistently read over the years that the two types of oil in question are compatible ie they won't form some sort of damaging emulsion or toxic brew. Ideally not the best situation but I have done it with other vehicles for various reasons and I haven't seen any ill effects. Maybe we have a chemical engineer amongst us who can comment.