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Message: <blockquote data-quote="Schwepps" data-source="post: 176603" data-attributes="member: 3592">That's an old trick, to use a more viscous oil in an old engine to mask the problems. It works, but it doesn't solve the problem. If Minivan's car is not having a simple mechanical failure causing a simple leak, such as a broken seal or improperly installed filter, then it's a case of an old engine signaling that it's time for an overhaul. His car is almost 10 years old and parts will get worn.You can use a mineral oil to mask the problem but if you don't fix it, it will get worse and worse, and cause more problems and costs. Eg, the cat converter and exhaust system will get clogged up and burn through. Eg, if the piston rings are worn, the cylinder lining will start to scour. Eg, if the valve seats are pitted, the valves will deteriorate and your top-end will get ruined. Not to mention that your consumption will get poorer and poorer, and you'll be adding partially combusted petrol and oil to the haze.Minivan, if you intend to keep the car, get it checked, and if it's the engine, overhaul early rather than late. The costs will climb the longer you wait.</blockquote>