Mixed synthetic oil running bad now

Jersey Big Mike

Well-Known Member
Supporting Member
What should I do I accidentally mixed a synthetic oil with non and now it just seems like it is running at half what it used to?
What is running at "Half what it used to?"
Dino and Syn oil wouldn't cause this by themselves otherwise they wouldn't sell it as a pre-made combo.
What else was done at the same time?
Is it mis-firing?


Well-Known Member
Base oil is just that. What twin said. Ground, ocean, desert, it's the same oil. Additive wise is the syn. So there is no way oil is going to light up an engine and make it run bad? Leave the new oil alone. Change spark plugs. How long since they were change? It's more coincidence that this occurred.