I was looking at this setup:
http://www.petitrc.com/setup/durango...ay20130113.pdf
Wooden flooring with carpet. Setup has fairly light oil, 30 front & 27.5 rear, which according to CoreRC conversion chart is 300cst and probably about 275cst.
I can go for 400 (39wt) all round and see what happens, if you think thats a better match for the piston and spring setup I have.