Oil Change

What would be the proper oil to use in my wr450f?

I live in an area where the temperature is mostly below 20 degrees celcius. :cry: :cry:

20 degress Centrigrade (oC) is about 68 degrees Fahrenheit. The Yamaha technical manual for the wr450F suggests 20W-40 Type SG motor oil at 5 oC and higher or 10W-30 at 15 oC and lower. I use Valvoline 10W-40 (winter) or 20W-50(hot desert summer) 4-stroke motorcycle oil, it has worked well for me for many years and is much cheaper than synthethic.

I use 10W-50, all season, ELF 100% sint, get it cheap, 7,5$/Liter

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