I used to pull race 6-seven times a night.i dont have an oil cooler and my past oils lasted only 300miles max until eventually they grew to become drinking water like.this lasts 1.5k miles with my driving.the 20w50 which essentially does not have the w..it can be 2050. it functions https://jdmtoyota2jzgtevvtiforsal09520.eveowiki.com/854688/not_known_facts_about_nissan_rb26_engine_for_sale