Originally Posted By: wemay
Originally Posted By: qdeezie
I bought ST 5w-20 synthetic for my Elantra and my engine ran erratically the entire time I ran it. My engine would surge when I would stop, I would hear the engine tap at times after making a long drive.
I am a big fan of Supertech products, especially their high mileage motor oil, but I can't do it in my Hyundai.
Someone mentioned that it may have been my oil filter, but I was using an OEM filter from the dealership.
Maybe I got a bad batch or something, but I won't be using it in my Hyundai again in the immediate future.
After I changed back to Pennzoil Ultra, everything became normal again in about a few hundred miles.
Blaming this on the oil is highly speculative. I would take the car in and see what codes were thrown considering how 'erratic' the entire oci was.
I don't think there's much to speculate to be honest with you. There was one change that occurred and it ran differently. I changed the oil and filter out to what I was using previously and it ran normally afterwards.