I used to tug race 6-seven occasions an evening.i dont have an oil cooler and my past oils lasted only 300miles max until they became h2o like.this lasts 1.5k miles with my driving.the 20w50 which in fact doesn't have the w..it's 2050. it acts similar to a 50 when its https://mylesixnvf.wikicommunication.com/4816147/nissan_rb26_engine_for_sale_fundamentals_explained