Synthetic oil has smaller molecules than the traditional oil so synthetic will leak easier.
Synthetic has been proven to out perform traditional oils time after time.
What it comes down is to preference.
Synthetic in cars that are driven daily and in very harsh conditions is what I recommend.
Traditional oil in cars that see everything else is what I recommend unless it calls for synthetic from the MFG of the car then run synthetic all the time.
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Mark V
1998 Explorer 4.0 SOHC
1998 Windstar GL 3.8
2001 Corvette Coupe 6 Speed
2006 Honda Shadow Spirit 750 http://public.fotki.com/snextime/
If your Exhaust tip is bigger than your cylinder bore, you are a Ricer!
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