DRIVEN Joe Gibbs JGR00506 00507 XP4 15W-50 Conventional Racing Motor Oil - 1 Quart Bottle, Case of 12 Case of 12 single 1 quart bottles High Zinc and Petroleum (mineral) based racing oil XP4 provides proven anti-wear protection in highly loaded valvetrains XP4 delivers low cost protection for racers who don't want to use synthetic oil Excellent for nitrous engines and dirt racers who need to change their oil frequently