Mobil 1 0W20 every 2.5k miles.
I've had my '88 GLI 16V for over 20 years and always used mobil 1 15W50 without issues.
Motul 8100 5w-30
Motul 8100 5W40 (track toy)
Mobil 1 since day one (first oil change). 5w-30 (as per vehicle spec). 316k+ original owner miles. Virtually no carbon or varnish.
I will say after switching to mobil1 in one of my rigs it cleaned out a hell of a lot of shitty carbon deposits and crap in the valvetrain. Looked nearly new when I pulled the valve cover at 210 thousand miles.
I use Mobil 1 because it's the only oil that prevents VVt noise in my NB Miata
I've only used Mobil 1 5w-30 Full synthetic. I think it's the only oil I would ever use. This Mobil 1 oil has simply been the one that I used from the get go, mainly due to recommendations, and it does what it needs to do. I feel confident using the product.
The Toyota mechanic who has a YouTube channel (Car Care Nut) has previously said that Toyota OEM oil is Mobil 1 (with a few exceptions for collaboration cars).
Mobil 1 - thins out a bit and there was quite a bit of consumption when I used this oil for my first change
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