I used to drag race six-7 periods a night.i dont have an oil cooler and my past oils lasted only 300miles max until finally they grew to become water like.this lasts one.5k miles with my driving.the 20w50 which essentially doesn't have the w..it is 2050. it acts like a 50 https://elevemotors.com/product/jdm-mitsubishi-outlander-4b12-engine-for-sale/