Not another "Which Oil" thread.
I do my own changes around 6k-7k miles with Mobil 1 filter and usually go with what Mobil 1 is on sale/deal at the time.
Can i mix 2qt of 0W-20 extended performance with 5qt of Mobil 1 0W-20 Advance fuel economy + 1Qt of Advance fuel economy i have left over to get 8Qt for my next change?
I would never mix different brands or weights but wasnt sure about same brand and weight with different "platforms"?