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I tried a bunch of different types and none of them were any good on either my E46 or my E90. This summer I just switched to the BMW oil from the dealer. The E90 runs fine because it's newer, so time will tell. But the E46 is a new car, the annoying pre-ignition rattle is gone and it consumes less oil than before. I'm just not going to bother anymore with constantly trying something new.
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