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This question persists...
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IIRC I had the same oil recommendation / availability situation with my 570. The same numbers I mean.
I'd take the 20/50 based on a chat I had with a local Motul dealer who seemed to take care and pride in his job. If my understanding is right, then you want to have at least the stated viscosity at temperature, so go with the 50 number. The 20W viscosity at low temperature means that the oil will be thicker at startup compared to 10W. It then lubricates/protects better but may lead to slightly harder starting - slightly - as there's more drag for the starter motor to overcome.
But then the hot viscosity rating also depends on temperature - cooler climates take lower viscosity as the cold makes the oil run thicker. (Some KTM guys 450-525-530 riders found sucked-in oil filters at low temperature in winter riding ... they switched to the next lower viscosity grade - thinner stuff - and didn't encounter it again.)
(The Motul guy also said "yeah, your 570's probably going to like the 10W60 stuff too". AFAIK he has some experience with KTMs and 'Bergs - he sounded like he knew what a 570 was.)
I'd take the 20/50 based on a chat I had with a local Motul dealer who seemed to take care and pride in his job. If my understanding is right, then you want to have at least the stated viscosity at temperature, so go with the 50 number. The 20W viscosity at low temperature means that the oil will be thicker at startup compared to 10W. It then lubricates/protects better but may lead to slightly harder starting - slightly - as there's more drag for the starter motor to overcome.
But then the hot viscosity rating also depends on temperature - cooler climates take lower viscosity as the cold makes the oil run thicker. (Some KTM guys 450-525-530 riders found sucked-in oil filters at low temperature in winter riding ... they switched to the next lower viscosity grade - thinner stuff - and didn't encounter it again.)
(The Motul guy also said "yeah, your 570's probably going to like the 10W60 stuff too". AFAIK he has some experience with KTMs and 'Bergs - he sounded like he knew what a 570 was.)
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Probably because it costs about the same as liquid gold.
About starting in cold.
My 650 wouldn't start from -7c with the kicker, it would burst to life for a second, then shut down, probably too much resistance of the cold oil for it to idle and non-optimal jetting? It does idle just fine otherwise and it did start after a little under hour in room temperature.
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First off, I hate Amsoil, based on one experience in a KTM 640 which required new Crank bearing shortly after trying it. No problems before or after that $#!+. They are an excellent marketing company but suck otherwise.
Multi-grade oils xWy would simply be:
xW is a "winter" viscosity rating, so 10W50, acts like a 10 weight oil at the cold test point.
While the 50 is a 50 viscosity at warm/operating temperatures.
Since you want to maintain the lubricity of the oil and the film thickness at operating temperatures, you want the 2nd number to match.
If you want cold starting, the smaller the first number the better.
Because multi-grade oils use viscosity modifiers, you won't really find a 0W60,m as the spread is too great, if you do, its viscosity will likely degrade faster than oils with a smaller spread. If you are going for Winter riding, full synthetic is the way to go.
To answer your question, you can go to a 20W50, but it will be harder to start when cold, but the warm operation will have the expected viscosity. Personally I would stick with the 10W50.
Multi-grade oils xWy would simply be:
xW is a "winter" viscosity rating, so 10W50, acts like a 10 weight oil at the cold test point.
While the 50 is a 50 viscosity at warm/operating temperatures.
Since you want to maintain the lubricity of the oil and the film thickness at operating temperatures, you want the 2nd number to match.
If you want cold starting, the smaller the first number the better.
Because multi-grade oils use viscosity modifiers, you won't really find a 0W60,m as the spread is too great, if you do, its viscosity will likely degrade faster than oils with a smaller spread. If you are going for Winter riding, full synthetic is the way to go.
To answer your question, you can go to a 20W50, but it will be harder to start when cold, but the warm operation will have the expected viscosity. Personally I would stick with the 10W50.
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Probably because it costs about the same as liquid gold.
haha
I think the 50W Motul he had was the same "excellent price for you my friend" I think he really did have an at least decently literate opinion of the viscosity, irrespective of cost (but I only charge as much for that info as I paid for it if you know what I mean?)cheap it is not, the motul! over here one dealer sells 300V for ISK 3251 per liter - USD 25 / € 22 per liter
hahha ... I'm going to assume that that is considered somewhat pricey in an international context?
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