Brad Penn Grade 1 racing oil in 10w-30 is what i use. You may not have a failure using other oils, but a high performance motor oil like Brad Penn has anti wear additives and high Zinc (ZDDP) levels and will give added protection to all moving parts, especially the camshaft. I've seen less than .001" wear on the cam lobes after two seasons of racing turning 9,000 rpm+ and high spring pressure levels. If you can afford a $3000-$5000 racing engine, you should be able to afford a good racing oil.