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did some digging along the way, and talk about your old wives tales.

So, once upon a time (who even knows how long ago now, probably over 25 years ago) synthetic oil effected rubber differently than regular oil.

This would in turn would cause a small amount of havoc with the valve seals causing them to leak.

Which has long ago been addressed and fixed - hence the "synthetic oil will cause your engine to burn oil" syndrome.
 

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Yes there are as many opinions and superstitions about oils as there are people who know how to take to top off an oil container.
 
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