Engine oil Mobil or PENNZOIL

I use Mobil 1 full synthetic(type 4)20w50 in the summer and 10w40 in the winter(we range on temps here widely, hence the change in oil viscosity by the season).

I use Mobil1 0W-40 on a 149K motor.

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.

I use Pennzoil Ultra 5W-40 European formula in both of my GTI's and use only oem filters (which are very good btw).

Mobil 1 0W-40, never lost a drop of oil with 72,000 miles APR Stage 2

My cars running hell of alot smoother by the way with this oil.

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.

i also switched to the mobile 1 0w-40 and dont burn any in my 2.0t

Mobil 1 0W-40 is what I use; had 0 oil consumption problems w/ stock pcv.

Of course this is assuming you're using really good oil, something like Mobil1 ESP 5W-30 or at least the Castrol LL03 VW507.