I used to pull race six-7 periods a night.i dont have an oil cooler and my preceding oils lasted only 300miles max till they became drinking water like.this lasts 1.5k miles with my driving.the 20w50 which in fact doesn't have the w..it is 2050. it acts similar to a fifty https://elevemotors.com/product/jdm-subaru-ej20-turbo-engine-for-sale/