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WOW that's a looonnnggg time for any oil change, toyota had there services for every7kmiles back in the 90's but had to chnage it because there was a HUGE sludging problem that was associated with the service intervals, we (toyota techs) are still now taking off heads and doing short blocks to engines that have had extended service intervals, because of this problem they shortend the intervals by 2kmiles to be at today's service interval at 5k which includes a tire rotation every 5k also. i'm just dumb founded at the time between chnages even with today's synthetic oils 15k is still definately pushing it even if it does have a BMW symbol on the front..... i will be chnaging the oil a hell of alot sooner than that, every 5k on DD and probobaly everytime i take it to the track or run the hell out of it.
cartridge filters are just as easy to replace/maintain as the regular filters are i do both day in day out 5 day's a week.
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