I concur Sir CHECK your oil every time you fill up...NO matter what..this gives you a great opportunity to see what is going on with whatever type of car or piece of equipment you are operating..It is a little late when you pull the dipstick and find you have little or no oil...Easy Preventative maintenance that goes a long way!As others have mentioned, go to at least a 5W30 and choose a quality low volatility synthetic oil. Which Mobil1 oil did you choose? I run the Mobil 1Extended performance which performs well in every respect including volatility. I check oil every fill up. 4 OCs on the 2.0T at 5k intervals and no loss. Nothing in the catch can either of note.