I have been using 15W-50 Mobil 1 in the '92 Jetta for the past 130K miles (it has 264K miles total on it !!!). It doesn't leak or burn a drop and it is all original (best motor I have ever had!!!).
I recently tore down a Ford 302 V8 with over 300K miles on it which I know ran Mobil 1 all of it's life and it was just as clean as the new (Jasper) engine being installed! No varnish, sludge build up and virtually no wear!
I have found little if any inconsistancy from using Mobil 1 5W40, Redline, Royal Purple & Amsoil. Since Mobil 1 is much more readily available I chose to use that and works out great for me.
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
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