I Change my oil every 4000Km and use Mobil Delvac 1 5w40. You can get it at Walmart. I like the 5w40 because it his light enough if you have to start your car below freezing there is no oil starvation. It is also heavy enough that it protects well under high revs, high heat and heavy loads.
I pulled my chipped K03 at 50K miles and looked at it, along with the oil lines, and everything was perfect. Not one sign of coking. This was after using Mobil 1 from 10K to 50K.
15w/50 mobil1 or 20w/50 anything else. fixed me right up.
Go with a decent brand like Mobil 1 SuperSyn 0W-40 next time.
Mobil1 0W40 is thin enough for me.
Mobil 1 is still in a beach chair sipping Corona's at 260deg
i use 5-50 non mark (mobil 1) my egine dont sound and my car dont need that weekly oil refilling any more
castrol 5-50 synthetic in my vr6 passat , 5-40 mobil-1 delvac in my TDI passat.
Due to the higher milage on my motor I run synthetic 15W-40 (Mobil 1) year round.
I use regular, dino, Mobil 10W-40. I got so many miles on my Passat(185,000), that I don't using synthetic Mobil 1 would help much.
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