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Hear is my 1st and last experience with Valvoline Synthetic. Wifes car, 2001 Lexus Rx300 with 203k miles on it. Since the original oil I have always and I mean ALWAYS have used Mobile 1 10/30 with Toyota filter every 4k miles. Blackstone labs does my testing. Last month we went from Ga to Co. It was a 1800 mile trip one way. I was in a big rush to get everything in my life ready before we went out of town. The night before I had remembered I forgot that I didnt change the oil. I went to Walmart and they were out of my oil. I used Valvoline Synthetic. The car has never used a drop of oil since new. I was checking the car over before heading back to Georgia. It had used over 2 qts of oil on the way out there. I was freaked. I went to Walmart in Montrose, Co and got my M1. Checked it frequently on the wy home and it never burned a drop.
I guess that engine with that many miles on it just does not like Valvoline. FYI, I own a mobile fleet repair business, some of my customers ask me to use the cheapest oil I can get in regards to price. I use Supertech for them. I have been using this for over 3 years and have never had a customer have one engine problem with this oil. I use Shell Rotella most of the time since most of my customers have diesels.