I used to pull race 6-7 periods a night.i dont have an oil cooler and my past oils lasted only 300miles max until finally they turned water like.this lasts one.5k miles with my driving.the 20w50 which in fact doesn't have the w..it's 2050. it acts similar to a 50 when https://elevemotors.com/product/jdm-nissan-sr20-turbo-engine-for-sale/