Quote Originally Posted by Masterbanter
Different oil companys add different aditives, That makes them different. Sludging engine oil is easy if you only drive it around 10 miles at a time. It will heat up just enough to cause condinsation or moisture. Inturn causes sludge.
10 minutes of driving highly unlikely would generate enough moisture for sludge. However, sludge isn't even caused by moisture. Its caused by oil and not completely burnt exhaust, engine breakdown(metal particals) and the likes

Moisture does nothing but THINS oil out when it actually mixes, turning it white.

Speedminded has it right too. There really is no companies out there selling actually FULLY synthetic oil. None that I can think of that is. Therefore I run the next best thing. Honestly I've come to find it better than any fully synthetic oil i've had the chance of running anyways.