Answer
No, you can even mix them.
Answer
Before switching from petroleum oil to syntheitic oil, I would suggest putting a detergent flush thru the engine to remove all the gunk left by the original oil. Add deteregnt to engine, with old oil still in it , run for 30 minutes, then drain crankcase completely. Remove engine oil pan, scrape out solids and replace with new pan gasket, and install a magnetic drain plug to catch metal bits, and re-install pan.
Add new synthetic oil, check for leaks as engine runs in the new oil. Check engine cold, daily for 7 days, before starting engine. Change synthetic at 5,000 miles and check for metal debris in pan and in oli filter. Cut oil filter in half to look for metal bits.
Synthetic oil will last longer than petroleum based oils but they are sensitive to water or other contaminats. Check weekly for water on the top of the dipstick level.
Answer
No need to run detergents or do any prep when switching to synthetic. Synthtic oils are detergent rich. Drain old oil and put in the new ( change filter of course).
First answer by Clay. Last edit by ID3519008930. Question popularity: 52 [recommend question]
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