radunegru - I switched over the summer (132,000) to Mobile 1 Syn Tranny oil and it seems to be a bit smoother, most notibly right from the start of the drive. As long as you dont have any leaks you shouldnt have a problem with holding oil. As far as drain intervals, with syn engine oil you can prolong intervals but as the interval is fairly lengthy anyways I wouldnt temp failure. Not that it wouldnt keep lubricity properties, but rather that changing it would prevent any sediments from getting any where they shouldnt.
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