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Message: <blockquote data-quote="chairoger" data-source="post: 250520" data-attributes="member: 1082"><p>So its quite true afterall what most of the guys had been saying. Cars with older and higher mileage engines should use thicker engine oils unless they dont mind topping up the oil once in a while. Using Mobil1 Supersyn(5W-50) and Shell Helix Ultra(15W-50). Both fully synthetic and I dont even have to top up any oil at all for the next 8-9k km. Probably the thinner oil(0W-40,etc)will be burn up more easily or even seap through the older engine seals. Now almost the same dilemma as you, thinking whether to stick to thicker oil or try thinner oil for better mileage and response. Hehe</p></blockquote><p></p>