First off I want to say if you havent had your shock oil changed in a while, get it done! Or it might end up like mine, viscosity being not much more than water. Continuing on... My service manual specifies 'ATF or equivalent' as replacement shock oil, is there anything better I could use instead; maybe something a little thicker as the shock bottomed very easily before. I know just puttting new oil in will be a vast improvement at this point, but I'm thinking a little ahead as it is the stock valving. Just looking for a little insight, putting ATF in it doesnt bother me a bit as it is the easiest on my pocketbook if more expensive oil isnt going to make any difference.