I used to tug race six-7 periods a night.i dont have an oil cooler and my previous oils lasted only 300miles max right until they became drinking water like.this lasts 1.5k miles with my driving.the 20w50 which basically does not have the w..it truly is 2050. it functions similar to https://jdmengine4ageblacktopfors74506.wikicommunications.com/4543181/about_13b_engine_for_sale_japan