Engine oil Mobil or LIQUI MOLY
I use Liqui-Moly Special Tec 5w30 in my 328i
I use LiquiMoly 2332, it’s a 5W-40. Works great for me.
Mobil1 Truck and SUV 0W-20 or Liqui Moly Special Tec 0W-20. I've noticed that Liqui Moly really quiets the valvetrain down. 2016 GX460.
I walnut blasted my intake ports and valves at 44K miles, myself. The intake portsand valves were not too bad, but there was definitely buildup on them and was glad i cleaned them.
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.
Currently running it in my B7 S4 with no problems.
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.
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