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Did Switching from Synthetic to Conventional Oil Contribute to Engine Stalling and Hard Starts?
 
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Question:
Did Switching from Synthetic to Conventional Oil Contribute to Engine Stalling and Hard Starts?
Does switching from synthetic oil back to conventional oil cause any engine problems? I switched my last used car to a high-mileage synthetic when I got it and it ran fine. But one of the next times I had the oil changed, I forgot to specify synthetic and the car stalled out a couple of times and became hard to start until I was able to get back in and have the oil changed back to synthetic. (This did seem to fix the problem.) Was this just a coincidence? I ask because I've done it again and I'd like to know if I should get it changed back to synthetic asap or if I should just hope for the best and see how it goes. Thanks!
-- David Stout, Oak Park, MI
Answer:
It is unlikely that your problem as described was oil related. Certainly hard starting/cranking in cold weather could be impacted by using switching oils especially if they were different viscosities. But stalling/hard starting is more likely due to other vehicle issues including ignition, fuel, and fuel injectors to name a few.
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