My father-in-law has an 89 Ford Ranger, 4 cyl. with 120,000 miles on it. He changed the oil every 3,000 miles with Quaker State. Recently,(2-3yrs ago)he switched to Valoline Max Life 20-50 because the truck started burning oil. It now burns approxinalty 1 quart every 800-1000 miles although it only blows out a fairly light amount of smoke on a "hard" take off. And since he parks it in his garage, it only leaks a very minimal amount. What type of oil would you recommend? Is their anything to slow down the oil burning? Has anyone been able to compare the Valvoline high mileage vehicle oil with any of the other brands? Thanks in advance for your input!!