I rely on the dealer for the aforementioned reasons of being free and having service records. My 1M just needs an annual change for the low miles I drive. After warranty, I would probably do it myself because I have nice facilities to do so....climate controlled garage, lift, etc.
For cars like our X3 that accrues more miles, I do incremental ones on my own between what BMW covers, because I personally believe the intervals are too lengthy (also did a break in oil change since BMW won't cover a car like that....but it doesn't negate the need IMO)
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-kskpsu
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