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The E90s actually have sensors to check the quality of the oil and adjusts the service indicator accordingly.
I have a hard time believing that BMW would approve the condition based service in their cars if a properly maintained car using synthetic would end up like that in the first post. I am sure BMW has done long term tests to see how the engine is like as well as the variance in quality of the oil over time with various oil change intervals. You may say BMW is doing this to save money on "Free Maintanance". But "Free Maintanance" is non-existent outside the Canada/USA but the cars still uses the same Condition Based Service indicators. So at the worse, maybe its not ideal to change exactly according to the condition based indictors but if you follow it, your engine should have adaquate protection.
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