Heres the problem Im having. I drive and race a 01 Pontiac v-8 Firebird that I recently bought. Im entered into a racing event(One Lap Of America) that has you drive the car at night and road race the car during the day. Total milege on the car for the 9 days is going to be aprox 7500 miles with 300 of them being road course miles. I did do an oil analysis of his mobil 1 with aprox 5,000 miles everything looked ok but nitrates were up. Which oil and weight would you recomend? I dont like going extended drain without working up to longer drains. I just dont know if I'm going to have the time during the week to change to oil. Finally one of my sponsors for the car is a Kendall/Valvoline distributor Im supposed to run there products but if there is something better I may sneak it in. Only one I have considered is Kendall Syn 5-40. Any inputs on this also. Im sorry for having to ask this. But the race is getting close and I need to have everything ready to go.