I used to tug race six-seven moments a night.i dont have an oil cooler and my past oils lasted only 300miles max till they became drinking water like.this lasts 1.5k miles with my driving.the 20w50 which essentially does not have the w..it's 2050. it acts like a fifty when its https://elevemotors.com/product/jdm-mazda-rx-7-fd-13b-rew-engine-for-sale/