15w40 vs 5w40 ?
#1
#2
#5
#7
Both run the same at operating temps as a 40 weight. Startup is where most engine wear can occur so using a 5W in cold temps should theoretically help with this. As mentioned, a 15W can work to pretty low temps.
You're correct in that 5W are easier to find these days. Many companies have gone away from the 15 as 5 will serve all purposes and saves them from having to make several grades.
Being in Georgia, a 15 will easily serve you purpose.
You're correct in that 5W are easier to find these days. Many companies have gone away from the 15 as 5 will serve all purposes and saves them from having to make several grades.
Being in Georgia, a 15 will easily serve you purpose.
#8
I'm not much of a Harley guy, so I wouldn't know which ones share oil and which ones wouldn't.
You're correct in that 5W are easier to find these days. Many companies have gone away from the 15 as 5 will serve all purposes and saves them from having to make several grades.
Last edited by kazairl; 02-26-2011 at 07:55 PM.