5w and 10w fork oil

[expansion chamber]

how much of a differnce would you notice from the two? I have 3 quarts of belray 10w fork oil Ive had on the shelf for years and deciding if I should use it on my next service. I was told by someone to use 5w on my 06 yz 250. Deciding what to do

 

[Matt90GT]

only use 5wt on the cartridge forks unless you revalve them for that heavier weight oil

 

[longtime coming]

Use the 10wt. You might not even notice a difference. You'll be able to make up the small variation with the clickers anyway.

JMO

 

[dirt bike dave]

Heavier oil will have a bigger impact on your rebound damping than on the compression side.

IMO, 10w will be a change for the worse.