There is an interesting discussion about the change in fork oil recommendation (for 750's at least) here: If you can stomach the price of Swiss Oil! $32/qt with a similar cost of shipping! 3 operation oil is, and Google is not forthcoming. Once a bike's forks are warmed up from some riding, 40C / 100F is a more realistic temp to compare oils at, as is discussed here:Īnd here's a comparison of popular fork oils at 40C: Unfortunately oil companies don't spec Cst at freezing or room temp, they just give pour points at extreme cold temps (below freezing). All of which would be too thin for good performing fork oil, but fortunately 100C is not a realistic temp for most of us, unless you're racing motorcross continuously across the hot bumpy desert.īut enough about heat, all oils are too thick when cold, which is where 20W would result in a hard ride with slow recovery, failing to get the wheel back on the road after a hard bump in a timely fashion. The difference at 100C is not much, like 7 Cst for straight 10w and 10-13 Cst for a straight 30w, or a good 10w-30. Like all oils, multi-grade still gets remarkably thinner when hot. Old-school 10w30 was made of straight 10W oil, and VII's (Viscosity Index Improvers), which lessened fall-of of oil thickness at temps around 100C. Using a 10w30 in a non-engine application would be more similar to using straight 10w oil than a straight 20W.
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