Since we're buried in snow & ice here, its time to renew the White Power rear shock fluid. Only thing more shocking than the WP shock is the price of KTM shock fluid: $217.00 per 5 liters! That's $43.00 per liter. Even my favorite imported rum costs less than that!:eek1 So off I went searching for info on alternative fluids: Ocrush, garage, etc. Nothing here popped up. I guess nobody does their own shock work or wants to talk about it much here. Specs on WP fluid are few and far between. I found a cross-referance sheet built by Red Line oil that is quite informative: Fluid Vis, cSt at 40degC cSt at 100degC V delta T WP 5w 24.6 5.1 4.82 WP 7.5w 34.0 6.5 5.23 The Red Line suspension fluid equivalents for shock service are: ExtraLight 2.5w 9.8 4.0 2.45 LightWeight 5w 18.4 7.1 2.59 (sorry, I can't get the horizontal spacing to format right), This stuff is $9.29 per 16 oz, less than half the cost of the KTM flavor. It is made in USA (Brea, CA, I used to fish there, but we didn't eat 'em!) I can get it locally thru normal auto parts distruibution channels. The interesting spec is the V delta T values. That is the ratio of viscosity at 40C divided by viscosity at 100C. The less change the better when comparing similar fluids. The Red Line product (at 2.59) shows only about half the change in this ratio vs. the WP oil (at 4.82), meaning the viscosity droops much less vs temperature rise, important in a shock for consistent valving behavior over a wide range of conditions. For shocks, viscosity at 100C matters more 'cause they run much hotter than forks, hence the LightWeight 5w looks like the best pick, given my riding loads/speeds/climate. So that is what I'm going to try. I'm gonna do this on my 5018 from the 250 EXC first and see how it works as it was weeping at the seals anyway. Same p/n for the oil & seals with my 950A too. Anyways, its more fun than shovelling snow!