I just stopped by my local walmart earlier and saw that the price of M1 went down. I'm currently running Valvoline Synpower 5w 30. The M1 is only a buck more. Should I run the M1 instead? Are both oils group 4?
I was thinking about running the M1 Advanced Fuel Economy 0w 30 because I have read that it's the best of the M1 oils and it's the same price as the other weight oils with the exception to M1 EP.
What group does Quaker State fall into? And what about Pennzoil PP. Both are made by shell. I'll stay away from the Castrol unless Walmart starts to sell the GC 0w 30