if it has cl2 in it you should never use it and i read that it does. Swimming Pool Chlorine in my engine never if u use moble 1-- 0 40 of 5-40 u do not need any thing else. just change your oil and filter ever 4 to 5000 miles or ever 5 to 6 months. ((((unless you race or drive the car very hard, then change your oil ever 3 months or 3 to 4000 miles)))) jim