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If your car has been well maintained and if you intend to continue with conservative OCIs (within OEMs recommended service intervals) , there is no special process required when switching to a synthetic.
However, if the engine has high mileage; service history of your car is unknown; if it has not been serviced regularly; or if you suspect the crankcase contains abnormal deposits, you might want to consider using one of the various crankcase cleaning products available prior to installing the synthetic oil.
Recommend you monitor your oil level over the service interval to make sure there is no abnormal consumption. Synthetics typically contain more robust detergents and they will eventually clean deposits left behind by petroleum oils. If the synthetic oil becomes prematurely dirty from this cleaning process, oil consumption could increase. Should that happen, you would simply drain the oil and install a fresh fill of synthetics.
Bottom line is that you should be OK to do a direct switch providing your engine has been well maintained; stick with mfgr-recommended OCIs the first couple changes; and keep an eye on your oil level. Your engine will thank you for this :-)
Last edited by talkinghorse; 12-17-2008 at 07:34 PM.
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