| This is something you should discuss with your machinist. A standard build with stock clearances a good 10-30 with EOS is all that's needed. Once you start getting into racing clearances a good 30W like Pennzoil is great. 40W oil is not good for break-in unless your motor and pump is clearanced for it. Most engine builders use one brand so when they inspect the filter the color, feel, smell and possible debris will be familiar. Stay away from any 10-40 oil as Steve said. I been blending different weight oils for different seasons or occasions for years
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ED BAKER
87-T, Maplight equipped rear view mirror..
93 PARK AVE"SUPERCHARGED" BPG#1458 My Photo Page   buickperformancegroup.com "As democracy is perfected, the office of President represents, more and more closely, the inner soul of the people. On some great and glorious day the plain folks of the land will reach their heart's desire at last and the White House will be adorned by a downright moron."---H.L. Mencken 1927 |