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I use Belray Thumper oil. It only comes in 20w-50 and its good stuff. Semi-synthetic and very good. Got alittle expensive lately (7.00 a quart) and tried a 10w-40 full syn this time. Its Repsol and only 6.00 a bottle and it seems jsut as good.

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Some basic oil info: http://www.thumperfaq.com/oil.htm

My preference is Maxima Extra ester synthetic, in both the engine and trans sides. If any motor needs a synthetic, it is a screaming 450!

http://www.maximausa.com/products/4stroke/maxum4synthextra.asp

http://www.maximausa.com/technical/lubenews/LubeNews2002.pdf

In Calif, I run 15W50 in the hot summer months, and 10W40 in our relatively mild winters. If you ride a lot in very cold weather, maybe 10W30 or 5W30.

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Should I use 10w-40 or wut for my 04 crf 450r? Also what oil do you recomend?

shell Rotella Oil in both sides (10w 40). It's good oil and you can buy it at Walmart for $7.50 a Gallon. I change my oil every other ride so it saves me big dollars.

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shell Rotella Oil in both sides (10w 40). It's good oil and you can buy it at Walmart for $7.50 a Gallon. I change my oil every other ride so it saves me big dollars.

15/40w = Rotella doesn't come in 10/40w

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Pick out the grades(10,15,20w) after the tempratur in the air and how hard you use the machine.. the higher the grade the oil got the thinner the oil is.

In "normal" temp. use 10w-40 don`t spend all your money on oils that is not right for your use. I use Motul.. Excellent oil!

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Motul 5100 ester in both sides here. May try and find that shell stuff as I am a little over keen with maintenance etc.

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Dude, stick with the Motul, it is way superior to Rotella!

That's your opinion. Opinions are like a$$holes everyone has one. :thumbsup:

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