I used to tug race six-seven times a night.i dont have an oil cooler and my past oils lasted only 300miles max until finally they grew to become drinking water like.this lasts 1.5k miles with my driving.the 20w50 which really doesn't have the w..it really is 2050. it functions like https://13b-engine-for-sale-japan55058.gigswiki.com/5015100/what_does_13b_renesis_engine_for_sale_mean