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We have to think logically and not what somebody else is imposing us to believe. It is very simple to determine whether your engine needs oil change or not. Did anybody ever in his life saw a test with two same engines, one changing the oil and the other no? I have never seen such a test. It is very simple to determine but the oil companies dont want that test. They wanna sell more and more. They dont care for pollution and global warming. It is extremely simple to find out, i have never seen any documentation program which could be done very easily with two same engines! Think people,
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