Originally Posted by travelover
Okey dokey. I wouldn't want your engine to seize because the oil was 20 vs 16, particularly in hot weather.
Never said 0W-20 would cause engine problems, my issue is using an oil different from what the manufacturer specifies while the vehicle is still under warranty. If you do run into engine trouble while the vehicle is under warranty the first thing the dealer/manufacturer is going to do is review all your maintenance records to make sure you followed everything they required.