Group, Over the weekend, I did some work to my car that for safety's sake, required me to change the oil. I did have M1 high Mileage 10W30 in the car (all WalMart had at the last OC. This weekend, I was at a parts place, and didn't feel like going to Wally World, so I got 5 qts. of M1 0W40. I had ran it in my 99 300M with no ill effects. I put this in my 04 300M Special. I would think the differences wouldn't be that great, other than the cold starting characteristics, and slightly greater protection at warm up. Any thoughts??