changing between yamalube oil question

3 replies to this topic
  • djo269

Posted January 22, 2006 - 02:06 AM


I have a 03' YZ450. The guy before me(1st owner) only used Yamalube 4R 10W-50R semi-synthetic racing oil. I bought a case of Yamalube 4 20W-40 from because they had a reasonable price.
Would I be doing this bike a disservice by doing so?Any performance problems?
I really would like to hear from my Yamaha colleagues to know what you think...:bonk::thumbsup::thumbsup:

  • DPW

Posted January 22, 2006 - 06:42 AM


No issue...I'm getting ready to do the same thing, but I'm going the other way and switching to synthetic oil.

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  • mxis4me

Posted January 22, 2006 - 07:58 AM


probably not ive used 20w40 yamaha oil in my 2000 426 my 02 , 04 with no problems at all . on my 04 450 i started with the 20w40 then switched to amsoil synthectic for 1 season and then had to go back to the yamaha oil ( we lost the amsoil sponsor) but the bike never had any problems with switching oils .now im back using the 20w40 in my 06 450

  • grayracer513

Posted January 22, 2006 - 08:11 AM


Change the oil frequently; 5-6 hours max. Yamalube does not retain its high temperature viscosity particularly well according to testing I have seen.

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