I am using Castrol 0w-30 Synthetic. The Castrol distribuitor here in my country has a Audi A4 and he recomend to use 0w-30 synthetic. This oil meet VW specs. My dealer also recomend the same.
5w-40 valvoline synpower is the only synthetic (besides VW Dealer supplied oil) that has VW approval...says so on the bottle if you have a NAPA they can get it for you....i use it year round......
I was running Mobil1 5W30 and switched to Castrol Syntec 5W50...I noticed 2 things...first, the engine became a lot quieter...less ping sound...secondly, the gas mileage went up...
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 put in Shell Rotella t, 15w 40 and it seems to work a lot better than the castrol 15w 40
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!
Valvoline SynPower 5w40 is perfectly fine for 10,000 change intervals. As long as it meats CI-4 or VW505.00 or ACEA B3, it's a perfectly ok oil.
Definitly noticed a difference from dino to synth, through research redline seems to be one of the best....so thats what i use
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.
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