Originally Posted By: SR5
I have some Castrol Edge 10W30 in my oil stash, probably use it for my next oil change. I doubt I will notice a difference over the M1 5W30 synthetic in there now. But in theory the 10W30 should have lower volatility and more shear stability, which I like.
When it comes to the cold start winter W rating, get as much as you need, but no more than you need.
Is your 10w30 Edge an A3/B4?
I like our Edge HM 10w40 for this reason. It's only available at parts stores, but buying it on sale brings it to normal-ish prices.