You should be using a fully synthetic oil for the Beemer 6 cyl diesel. Most modern HDI dieslels require synthetic. You will also find that this type of oil wont go black so quick. I have 11000 miles on the clock and my oil still looks good. Synthetics also mean longer times between changes so the extra cost is to some extent off-set.

Nice to see the colonies finally catching on to the fuel of choice... more torque, more mpg and less carbon emmissions.

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Steffi