I used to pull race six-seven occasions an evening.i dont have an oil cooler and my past oils lasted only 300miles max until eventually they turned water like.this lasts 1.5k miles with my driving.the 20w50 which in fact does not have the w..it's 2050. it functions just like a 50 https://elevemotors.com/product/jdm-mitsubishi-outlander-4b12-engine-for-sale/