i used to drag race six-7 times a night.i dont have an oil cooler and my preceding oils lasted only 300miles max till they grew to become h2o like.this lasts one.5k miles with my driving.the 20w50 which in fact doesn't have the w..it can be 2050. it acts just like a fifty when its hot however it doesnt have a big viscocity change at that temperatur… Read More