Delo 15-40 oil in all our cars, and in the Chrysler stuff, WIX 1515 filters. I change the filter at 1500 miles and add a quart, change oil and filter at 3000. I will undoubtedly switch to a synthetic oil soon and I may extend the interval to change filter and add a quart at 2500 and change the oil and filter at 5k. Mikey 62 Crown Coupe