Castrol 5W-40 Eurocar. I live in the northeast and park outside. Car has been solid and I've used this oil since I bought it. 65k miles later, I see no reason to make a change now.
Previous comments about mobil 1 are right it’s best for reliability - castrol are seen as high performance oils
I use valvoline 5w-30 full synthetic in my g35. Runs great
Valvoline 20w-50 works great
I use Valvoline Extended Protection, it's really good stuff
5W-30 Castrol Edge. FPRS uses it and has had very few failures on stock motor cars. I was also running it in my GR86, and Blackstone came back perfect on that car.
Valvoline VR1 for the track car. Valvoline VR-1 is a very highly reviewed oil with a high zinc content to keep race engines running with very minimal wear.
Castrol in my daily driver. The daily would have a slight ticking when warming up with other brands, not with Castrol, so I been using it for over 100k with no issues.
I believe the final takeaway was that Valvoline Max protection was the best
And one thing I would definitely do is get the Castrol out of there if you intend to keep the car long-term. The recent changes to the oil we are delivered at the dealer is crazy!!! It's not the same as it used to be and I can tell a huge difference in my cars. Have had excess oil consumption, lower MPG and quicker deterioration of the oil over last 6 months using Castrol(and I work at dealer)
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