I use valvoline full synthetic 5W-20, I've used it for the past 25,000 miles and it seems to work great, and it's only $25 last time I bought a 5qt+ jug at walmart lol
BV heads, P&P lower, windstar upper, comp 218/226, 4.2 bottom end, 3k stall, flow 40's, O/R x-pipe, Pacesetter lt's, Xcal2, 65mm tb, CAI, 8.8 w/ 3.73's, MM LCA's
coming soon: blower cam and intercooled M112
dealer for Ortiz Performance; tunes, cams, etc. PM me!