Oh, that's right- I was thinking of the MB 229.51 spec that did allow for 40 weight. So there's essentially no daylight at all between the 5w30 and 0w30 507 oils in the Florida climate. Most of the new cars now use 0w20. That must really set some old geezers pants on fire, lol.I repeat, there isn't a 40 weight 507 oil. The spec doesn't allow it.