Started running penzoil platinum in my mazdaspeed due to the great UOAs it got on DI motors, and just now run that in all my shit to simplify my life. Only have to keep one oil around that way.
Valvoline is the best oil I can recommend to you. Not even Royal Purple matches it in quality. They have a +75K miles and a +150K miles version of the oil. All of my cars are now on it after trying them all (Mobil, Royal Purple, Pennzoil, Castrol), the only one that effectively prevented oil burn and sealed any leaks in my other cars was Valvoline.
Honestly, I just use Pennzoil Platinum for the past 7 years. but now I feel like reliability depends on the user, just keep up with the oil changes at least every 3k and if you’re abusing, just watch your oil temps. I have 145k miles and I abused this car since I had it at 0 miles. Still original motor and tuned by Admin.
Since switching to Platinum there are no oil leaks and less than a qt. to top up between changes.
I personally prefer Valvoline, they seem to know what they're doing and have their own engine lab to test and experiment with oils, and that oil they made specifically for hi-milage engines work bloody good at rejuvenating a smoky old engine.
I have to use high zinc oil, Valvoline VR1 is the only oil I can buy that has enough zinc.
Pennzoil Ultra Platinum usually or Castrol Edge. In North Texas I’ll run a cold grade of 10w in summer and usually 5w in winter. 40 or 30 summer hot viscosity/ weight and 30 winter. 4.2 version of your 4.0 S/C AJV8.
I switched to Valvoline last oil changed and really like it. Feels more lively than when I changed it in the past (typically use dealer recommended Castro).
I use valvoline extended protection
Older high mileage car: Pennzoil High Mileage blend. Works better for me than Valvoline MaxLife to reduce gasket seeping and weeping.
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