What oil grade?

I want to know what the best oil grade is for my 2004 wr 450. I usually use maxima 10w40. But was thinking about 200. And opinions?

It doesn't really matter as long as it's JASCO MA rated and matches the viscostity your manual recommends.

Thanks. Appreciate that

I usually use maxima 10w40. But was thinking about 200.

 

200? Explain.

Sorry typo. Supposed to be 20w 50

I have been using 10W40 wince I got my first WR in 2006. No issues thus far.

10w-40, 20w-40, 5w-40, 0w-40, and straight up SAE 40 are all the same at operating tempertures; They are all 40 weights at 200 ℉.  The only difference is in their viscosity when "cold" at 70 ℉.  The straight 40 will be the thickest, and the 0w-40 the thinnest.  The only reason you would chose a 10w-40 over a 20w-40 would be if temperatures where frequently lower than 50 ℉ where and when you ride.  The lighter "winter" grade (the smaller of the two listed weights) will flow better on cold starts.

 

Multi-grade oils are made by staring with a thin base stock, say a 10 weight, then adding "viscosity index improvers", normally consisting of bulky, long chain polymer molecules, which prevent the oil from thinning as much as it normally would when heated.  In general, these additives tend to be fragile, and the gearbox loves to shred them, so the oils with the biggest spread between their hot and cold viscosities tend to drop below their full grade weight sooner; your 10w-40 will become a 10w-30 faster than the 20w-40 will break down that far.  Again, that's a general rule.  Best practice is to use an oil that you either know performs well in this manner, or pick the 20w-40 over the 10w-40 in the absence of more info.

 

All that said, I've been running either Amsoil MCF or Mobil1 Racing 4T, both at 10w-40, for a long time, and I get excellent results with both.  I go to a 20w-50 when it gets hotter than 95 a lot during the summer.

Awesome. Thanks guys really appreciate it. I just started racing desert so I didn't kno if I need thicker oil or what ya she runs great does excellent on races. Thanks again

619165_front500.jpg

 

 

Cheap, available, good quality, and JASO-MA certified.  Change early and often.

619165_front500.jpg

 

 

Cheap, available, good quality, and JASO-MA certified.  Change early and often.

 

^x2

 

Good friend of mine talked me into switching recently after being a long time AMSOIL believer.  Been using rotella t for almost a year and i have zero complaints

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