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Message: <blockquote data-quote="kyheng" data-source="post: 1295840" data-attributes="member: 13624">Seems like every one here have left out 1 very important thing on the engine oil lost.Some background of engine : everything that rotate will have wear and tear include the piston rings. If the engine is rev to 4.5k and above regulary, the piston rings sure will wear faster and creating some small gap between the holder and piston.Engine oil will change its properties when hot it will become lighter or more technical is the viscocity of the oil drops. So when the oil is hot, it will slip in to the combustion chamber and burn together with petrol. Depending on how much the slip-thru is, lesser we won't see any white smoke. When the gap is big, then we can see alot of white smoke. Petrol will tend to slip thru to engine oil also if the gap is big and make the oil become lighter. This don't have actual proof as the petrol in contaminated oil will booil off when the car is moving. So the best is don't adjust a car's timing more than factory default. If the enigine is vibrating, maybe is caused by other problem.Below are the examples of engine consumption on an old car(8 years and above) based on normal wear and tear or an uncle cars that never rev the engine till 4.5k and above.If we use syntactic oil(Shell Helix Utra or similar), the oil will only last you for 1-2 weeks or the lost is 50-70% as viscocity of the oil is lowest.If semi-syntactic(Shell Helix plus), the lost will be around 30-50% as the visco is higher.If use the lowest grade(Shell Super Standard) the lost will be 20-40% as the visco is highest.As wear and tear we cannot avoid, at the same time want to save money for the top overhaul, so the best way is add addative to the engine oil to bring up the viscocity. Then the lost will be lesser. Like my Wira 2003(done 95k), when using semi-syntactic oil the lost is around 10-20%, if add the addative, the lost is lesser at 5% only.</blockquote>

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