danrieke

Thanks for input. I don't run engine HARD before 500, just gradually harder as miles mount toward 500. Pushed mine to 3,500 in first 200 miles, then up to 4,500 to 500 miles. Also, Slick 50 in an older engine is bad. On worn, tired motors it turns them to slop with lots of blow-by and valve train noise. Best on tighter new engines. Slick 50 will not alter your mfr warranty.