I decided to use Blackstone oil analysis' on all the oil changes on my new 2012 WRX. Even though the information for the first few changes is skewed by the motor break in, I wanted to watch the levels trend and monitor the shearing of the 5w-30 oil. For potential warranty purposes, at least while the car is very new, I decided to stick with 5w30 for the first few oil changes. I chose Pennzoil Ultra, due to some pretty good UOA results that I've seen. After draining the factory fill at ~1,000 miles, I filled it with the Ultra 5w30. I will change it again at 3,750 to see how much it has sheared. If the results are bad, I will be switching to GC or T6 sooner than I expected.
This first UOA is of the factory fill at ~1,000 miles. The oil is so thin that I have a hard time believing the factory fill is actually 5w30 Synthetic. Could a 5w30 Syn really have sheared down THAT MUCH in just 1,000 miles?
This first UOA is of the factory fill at ~1,000 miles. The oil is so thin that I have a hard time believing the factory fill is actually 5w30 Synthetic. Could a 5w30 Syn really have sheared down THAT MUCH in just 1,000 miles?