I used to tug race 6-7 occasions a night.i dont have an oil cooler and my earlier oils lasted only 300miles max until they turned h2o like.this lasts 1.5k miles with my driving.the 20w50 which in fact does not have the w..it is 2050. it functions like a 50 when https://jdm-mitsubishi-outlander91396.ttblogs.com/8260831/the-fact-about-jdm-mazda-rx-7-fd-13b-rew-engine-for-sale-that-no-one-is-suggesting