is ams oil 0w40 safe?

my, question is, is ams oil 0w40 safe for a wr 450f or would the "0" be to thin? hard on valves ect? i ran it before for about 300 miles and seemed to work good, then i switched to ams oil 10w40 and found my power had dropped off? also some extra info this bike is a supermoto on road and riddin hard. thanks

They are both 40 when hot so they should be the same.

You could go down to a 0w30 if you really wanted to.

I have found that a 15w50 seems to last longer, so thats what I use.

How long are you getting out of the thinner oil?

for the .02 hp you loose i would heavier oil better breakdown protection

summer 50-120 degreese 20/50 klotz synthetic

winter 0-40 degreese 10/30 klotz synthetic

not sure about the time i get with the oil, i don't ride alot but when i do i strech it's legs, so i change it often.

my, question is, is ams oil 0w40 safe for a wr 450f or would the "0" be to thin? hard on valves ect? i ran it before for about 300 miles and seemed to work good, then i switched to ams oil 10w40 and found my power had dropped off? also some extra info this bike is a supermoto on road and riddin hard. thanks

You shouldn't see a drop in performance if the higher number stays the same. Only a slight drag co-efficient difference as the engine warms from dead cold but never enough to notice a performance drop at temperature. Your ambient temp and riding habits will dictate the oil weight to use. Ontario is pretty cold eh? A 0w30 is fine for colder climates and up to a 10w50 for the hot stuff. I use a 20w40 in Arizona summertime and 10w30 the rest of the time.

A couple more things about one of my favorite subjects. The "w" is for winter, or more accurately, cold weather viscosity. As well, the bigger the difference between the low and high number (ie: 10w50 vs 10w30) is acheived by adding more viscosity modifiers and thus there is less lubricating base material. Therfore slightly less life out of the higher delta-t. Synthetics seem to give better and more even life across the board but cost quite a bit more. Call me old fashioned, but I like petroleum products best.

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