Engine oil

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Bruce Crone

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Apr 5, 2009
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2003ST, I accidently put 5W-30 synthetic in my engine that already had regular oil in it. What should I expect if anything????
 
I don't think it will make a difference. How much did you put in? As long as you didn't go over 5 quarts total you should be fine.
 
IOW you now have a "blend".

As "Nobleman" stated, almost all motor oil mfgs. offer a "synthetic blend".

No harm done. Probably better anyway.
 
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