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 used OEM Mazda Moly 0w20 oil for most of the last 8 years, until I started getting coolant showing up in my Blackstone used oil lab reports. Switched to Mobil1 5w30 high mileage this last time, 2,500 miles ago.
I used Mobil 1 with my Mustang. I like it for my timing chain and valve line. It’s very good. Car runs quiet.
Good old fashioned Mobil 1 for me. It wasn’t available during the pandemic so I used Valvoline Synthetic for a couple of years.
On my Giulia I've used 3 different 0W30s, and presently using Mobil 1 ESP 0W30.
I've put over half a million on four different vehicles, several hundred thousand on a few others, all running Mobil One.
If I could only have one oil for all my vehicles it would be Mobil1 0w-40 because it meets all the stringent European requirements and has been shown to have a cleaning effect on dirty engines.
Older high mileage car: Pennzoil High Mileage blend. Works better for me than Valvoline MaxLife to reduce gasket seeping and weeping.
My 1.8T has just over 103k miles. I got it at 78k, and until about the 95k mile mark, I've been using M1 0W-40, then switched to M1 5w-40 Truck and Turbo-diesel, since I wanted peace of mind with its extra additives and protection. I figured since this oil is meant for high operating temps and high load in turbo-diesel engines, it would be just as good in my daily-driven and weekend-tracked 1.8T. I change my oil a few days before going to beat on it over the weekend, otherwise I'll change it every 3k to 5k miles. Also, I have had some valve noise (tapping of some sort), the whole time I've had the car. I'm guessing it's lifter noise. I'm not sure, but I was told to try a heavier weight to counteract it, hence the switch to the only decent 5W-40 sold on base. Still no difference in noise.
I used 0-40 mobil 1. It turned out pretty bad for me, I ended up using more oil than I ever had before. The car smelled like a friggin chainsaw with that stuff. The engine only had like 100k on it, but the blowby was horrible with 0-40. This was just my experience. I use mobil 10-40 now and no problems so far.
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