If the QS 25W-40 is NA, you can use SAE 30 detergent motor oil, for moderate climates. You also might look at the OEM recommendations, as there are a lot of FC-W motor oils (used in 4 cycle outboard motors) in my local Wallyworld that might be recommended.
I never thought "Trying an oil", vs using the recommended stuff, was prudent
What is an oil I can get locally that I can use? Walmart used to carry QS 25W40 but no more. They still carry the Penzoil 25W40 but I’m not sure about that stuff and it’s expensive. The old Merc manual says 40W which I can get at Tractor supply. It should always be above 50*. It also says no multi weights which the QS is supposed to be 25w and 40w oils mixed/ blended into the 25w40.
