I use Mobil 1 in my RT and it's been good.
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.
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).
Mobil1 15w-50 (red label) was always good to me, and readily available at wally world. Never had lifter tick in my S50US, on track or otherwise, and it went to 298k before the head gasket gave up. Absolutely could have resealed the engine and ran it another 100k+ (swapped an S54 instead).
Yes, you can certainly use 506.01 in your TDI and it's used in many TDIs around the world. However, based upon some of the UOAs offered up, I'd suggest moving to 507.00. The 506.01 has shown relatively high wear metals.
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