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In my humble opinion, nothing over a 40 viscosity should be used, in an older wing. Unless you live in extremely hot climates, but even then, I would do some testing.
Your own experience seems to show you the same thing. Every engine is different and will react differently to the oil and gas we use. I had 3 different wings and they all had their preferences of oil. Various symptoms. Clutch function, engine noise, engine performance, operating temps, you name it. The same oil acted differently in all three bikes. I think condition of the engine makes a world of difference, as to why this holds true. Sludge build up, wear of bearings and seals, condition of the wiring and connections, fuel system wear and condition.....it all adds up.
Same thing when I talk to friends about their wings. One particular brand, weight of oil acts differently for everyone. Plus everyone has their own style of running, or operating their bikes.
All of this, of course, IMHO.
In my humble opinion, nothing over a 40 viscosity should be used, in an older wing. Unless you live in extremely hot climates, but even then, I would do some testing.
Your own experience seems to show you the same thing. Every engine is different and will react differently to the oil and gas we use. I had 3 different wings and they all had their preferences of oil. Various symptoms. Clutch function, engine noise, engine performance, operating temps, you name it. The same oil acted differently in all three bikes. I think condition of the engine makes a world of difference, as to why this holds true. Sludge build up, wear of bearings and seals, condition of the wiring and connections, fuel system wear and condition.....it all adds up.
Same thing when I talk to friends about their wings. One particular brand, weight of oil acts differently for everyone. Plus everyone has their own style of running, or operating their bikes.
All of this, of course, IMHO.
