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Old January 11th, 2019, 13:16   #1
midairmark
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Join Date: Aug 2008
Location: GA
Fuel Economy: 55-60 MPG-6 speed
Default Idiot me, put in wrong oil month ago, OK to leave?

Well I screwed up my last oil change, didn't look at the label and put the wrong oil in. I usually use Mobil 1 full syn. truck diesel, 5w-40. I had a lot of my mind about having a car transported and just picked up the wrong container. I put in Mobil 1 full syn. 5w-30 for the wife's gas car. I didn't notice until today, when I went to change her oil and noticed I had a full gallon of diesel oil, unopened!

I have been driving the car at least 3 weeks with that oil in it. I don't beat the car, just transportation and I don't rev it higher than 2500 usually. It has 237k miles on it, 01 Jetta.

Do you think I need to change the oil out or do you think it is OK until next oil change?

Thanks,
Mark
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