Mobil 1 15W-50?

[ilko]

I'm about to do a 50K service on my car. So far I'm looking to do the following:

Fuel Filter
Spark Plugs
Engine Air Filter
Cabin Air Filter
Brake Bleeding
Oil Change
Anything else?

Also, I track my other highly modified, air-cooled car a lot so I have a huge amount of Mobil 1 15W-50 full synthetic oil in my garage. Being that the Audi will be driven in hot conditions this summer, I'm thinking of using the Mobil 1 !15W-50 higher viscosity oil (I use 5W-40 synthetic in the winter). My question is, has anybody used this higher viscosity oil and is it VW approved for the 1.8T engine?

Thanks!

[mike-2ptzero]

Here is what it says on Redline oil's web site about 15w50.

Not recommended for street use in production engines that see sustained oil temperatures below 225°F

Every person that I know that runs 15w50 does it for track only.

[CO AVANT]

You can run that 15W50 in your car, but it will not be as responsive. That is a really thick oil. Got to think of how your crank turns easier in a lighter oil, thus making full spool/power quicker. You only need that kind of oil in your car if it is getting piss ass hot! I personally would run 5W40 in summer.

[AudiA4Style]

I just hit 140k and been using 0-40 since my first oil change.