I use Mobil1 0W-40 on a 149K motor.
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I've used 0W40 Mobil 1 Full Synthetic from the beginning. I have Blackstone Labs constantly analyze my oil. It started with several 5k mile analysis and then I upped it to every 7.5k miles. The oil analysis came back very healthy on all 5k and 7.5k mile analysis, and led me to up it once more to every 10k oil change interval which it will remain. I use the larger Passat 1.8T oil filter. The engine has almost 170k miles on it and still running strong.
Pros: very healthy oil analysis, extended change interval
I'm running Amsoil 5w40 or Castrol Syntec 5w40. I ran Mobil1 10W30 a few times and I heard too much valve noise. When I opened the oil cap after driving around on the freeway it was smoking..which I'm not all that happy about. So I stopped using this oil.
Cons: too much valve noise, smoking
I usend to run syn 15w50 in my tired old vr6 all year round, it helped with seeping issues, lifter noise and all if that. but the oil pressure would be through the roof during first start. so I'd set aside a few mins in the morning to let the car idle, relax, listen to a song and let it get some heat in it. on a normal day, the star up pressure would be .5 bar past the filter bypass (10 bar), warm idle was 2 and a bit, and everything above 3.5k was back to the bypass.
Pros: helped with seeping, reduced lifter noise
Cons: high oil pressure on start
Vehicle:
Volkswagen
My 1.8T has just over 103k miles. I got it at 78k, and until about the 95k mile mark, I've been using M1 0W-40, then switched to M1 5w-40 Truck and Turbo-diesel, since I wanted peace of mind with its extra additives and protection. I figured since this oil is meant for high operating temps and high load in turbo-diesel engines, it would be just as good in my daily-driven and weekend-tracked 1.8T. I change my oil a few days before going to beat on it over the weekend, otherwise I'll change it every 3k to 5k miles. Also, I have had some valve noise (tapping of some sort), the whole time I've had the car. I'm guessing it's lifter noise. I'm not sure, but I was told to try a heavier weight to counteract it, hence the switch to the only decent 5W-40 sold on base. Still no difference in noise.
Pros: extra additives, good protection
Cons: no difference in noise
Vehicle:
Volkswagen
Mileage: 103000 km
I stay away from Mobil 1 and Castrol because although they are everywhere they are not as good as they euro synthetics. In Europe they are not even legally considered synthetics. When I drain mobil1 it looks black and the engine is missing a quart...
Cons: looks black, engine missing a quart
Mobil 1 0W-40, never lost a drop of oil with 72,000 miles APR Stage 2
Pros: never lost a drop
So, again, I bought a new one and threw it on just last night. I took it for a ride to get it warmed up and I'm still having low oil pressure.
Cons: low oil pressure
Vehicle:
Volkswagen
Mileage: 115000 km
My cars running hell of alot smoother by the way with this oil.
Pros: running alot smoother
Vehicle:
Volkswagen
At around 60k the car really began consuming oil (1qt every 2000 miles or so). I used to use regular 5w-30 oil, and then switched to Pennzoil full synthetic 5w-30, which didn't help the problem at all, and maybe even made it worse. Finally, i switched to Mobil 1 0w-40 and all consumption has basically come to an end. I've not had to put a drop in it after 1500 miles and its at the same level as the last oil change.
Pros: consumption basically came to end
Cons: consumption increased with Pennzoil
Mileage: 96560 km
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