What happens if you accidentally put 2 quarts of 5W20 and 1 quart of 5W30 synthetic motor oil in a 2006 passat?
by 
Anonymous
ANSWERS: 6
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bye bye dear engine.
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Contact your favorite auto mechanic and ask him/her what steps to fix it, or call the manufacturer of the car.
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if you dont start and drive it you can unplug it and drain the oil.
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They are both oil and though the synthetic is a better grade it shouldn't react with the regular oil in any bad way. I think I saw you could even buy blended quarts from the oil companies. The only problem I'd expect is diluting with regular oil might hinder the friction-reducing qualities of the synthetic. But it certainly wouldn't be any worse than straight regular oil. DO NOT MIX detergent and non-detergent oils.
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The World Ends!!! OMG!!! Look what U've done now!!! Are U Proud of Urself now, U've Killed Us All!!! Feel bad yet??? The only thing that may happen is U develop a minor leak as the Synthetic will find & use any crack or crevice to exit stage left! The engine speed may go up a bit as it is much more slippery than conventional oil. But no real harm should occur & at Ur next change, use All Synthetic as they are so much better for All Moving Parts (Unless U have Leaks!)!!! Engines run cooler, less wear, better mileage too!!! Put it in Transmissions, Rear Ends, Wheel Bearings & Drive Shafts (CV Joints). John
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nothing to worry about ;) fill the rest up with what's supposed to be in there and you'll be fine ;)
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