buddies 2013 impala with the 3.6 DI engine, 150k miles out of warranty obviously. Those of you who have run non dexos oils in these GM DI engines, which have you had success and good UOA's with? Looking for utmost protection, car is driven to Midland, Texas every 2 weeks 1800 mile round trip, all interstate miles 80-85 mph, and then once in Texas, constant sandstorms and dusty conditions. The car and under the hood is solid brown every time he comes back from a trip lol. I know the air filter is very important, we will swap out the current STP air filter for an ACdelco, and we will keep the oil changes at 5k, just looking for an oil reccomendation.