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Message: <blockquote data-quote="flash" data-source="post: 47723" data-attributes="member: 62">I have been using semi-synth oils in my other cars and have no complains on the performance of the oil and engine. What is important is regular and frequent oil and filter changes. I usually change the oil and filter at the 7,500 km mark but have been pushing it to 10,000 km of late with no detriment to the performance and durability of the engines. In fact my engines are still in pristine condition and smoke free (one at the 240,000 km mark and the other at the 100,000 km mark).I am also seriously thinking of "downgrading" the oil I use in my babe from fully synth to semi-synth. I have been hitting pretty high mileage lately and any savings in oil cost is a bonus. Still thinking though... :blink:</blockquote>