Yes some synthetic oils do not mix with petroleum oils, some do. But I had done this also with the same amount of miles with a synthetic oil (Amsoil) that does mix with petroleum base oil as there is some left in the motor when draining. It didn't work out good. I figure that it was too may miles to change over. Built a new motor and running on Amsoil as it is a good synthetic oil...
after getting the oil change i notice the difference on how the car ran.This time we used full synthetic instead of regular.Could that be the reason? my car has 166k
2006 Dodge Charger R/T RWD
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Maintenance & Repair
didn't come in nor did my car register hot. Now I am told my engine is gone. What is wrong with my car?
2008 Dodge Charger SE RWD
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Maintenance & Repair
I just had my oil changed on 11-4-15.
2006 Dodge Charger R/T RWD
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Maintenance & Repair
I had my oil changed just the other day and since then I have noticed a leak coming from near the front of the hood. I do remember my husband having a hard time removing the drain cap or whatever its ...
2010 Dodge Charger R/T RWD
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Maintenance & Repair
I just left from getting my oil changed and on the way home my check engine light came on and when I punch the gas or try to pick up speed it's like my car starts to fail and the the car will slow ...
2014 Dodge Charger V6 AWD
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Maintenance & Repair
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