This oil was used through the super cold winter in Chicago and i had valve cover replaced few month back. Some notes on the car, it has stalled once randomly while pulling out of a parking spot, no codes, and kinds is lazy starting sometimes. 1 QT of oil was added. at the moment there is Schaeffer 9000 in it, will see how engine likes it in 7K miles LOL. My G37 is coming up for an oil change in 1K with it as well cant wait to see the results.