Engine oil Mobil or LIQUI MOLY

Mobil Engine oil

M1 fs 0w40 has been working well for me. But this oil does lose some of its viscosity after a couple track days.

Pros: working well
Cons: loses viscosity
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Mobil Engine oil

Mobil1 0W-30 full synthetic. Just did my first 1000-mile oil change a couple hundred miles ago. Been using Mobil1 0W-40 on my 2011 WRX for 220k miles, tracked, autocrossed, and daily driver duty after 160k miles when I had a head gasket failure and I rebuilt the engine.

Pros: full synthetic, high mileage
Vehicle: Subaru
Mileage: 160000 km
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LIQUI MOLY Engine oil

I had been using LM in our Euro vehicles for years until prices started to climb. I switched to the appropriate Mobil 1 oil earlier this year. There is not enough difference in test results to make me stay with LM once the price difference became as big as it was during my last TDI oil change.

Pros: appropriate oil, years of use
Cons: price started to climb
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Mobil Engine oil

I learned mobil 1 is the absolute worst oil to use in Subaru engines, especially ej257. Simply because it is good oil but because of the poor oil cooling the detergents burn in the engines causing premature wear.

Cons: detergents burn, premature wear
Vehicle: Subaru
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