CRF 250R 04 steel valves question !

Kolias89 said:

And in cold temperatures what could happend?
There is a reason i am asking and i want your opinions!
Thanks!

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Unlike your family car, motorcycle engines, especially current models, have very small orifices that transmit the oil. Some of them as small as a pin. Oil with a higher viscosity does not flow through those orifices as quickly as a thinner viscosity will when the engine and the oil is cold. That is the reason for a multi-vis oil in the first place. Using an oil with too high of a viscosity rating can starve certain parts of your engine on start-up resulting in pre-mature wear. Like Joe said, in warm areas it may be ok, but, if you ride in colder areas it may be too high of a viscosity. It's best to adhere to the OEM's specs.