In my VN, always Mobil 1 0w-30 AFE.
I vaguely remember a video or a study done on mobile? Syntec or something, a somewhat scientific study pulling samples every 1k miles and sending out to a lab. Bottom line was that the oil actually got better over miles and they abandoned the project at 15k miles.
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.
I'm a Castrol syntec guy and I like Kirkland oil. So that's what my cars get.
Good old fashioned Mobil 1 for me. It wasn’t available during the pandemic so I used Valvoline Synthetic for a couple of years.
I'm personally running Castrol in the BMW bottle.
On my Giulia I've used 3 different 0W30s, and presently using Mobil 1 ESP 0W30.
Australia here - they used 10w-30
Feedback from showroom
The 10w-30 is the best oil due to the Australian conditions
Castrol oil MAG
I burn 1 qt of Mobile 1 0-40 every 1000 miles.
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