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Thanks for all the suggestions here - just performed my own oil change on 07 e92 that I purchased used (non-cpo). I wanted to get it changed, because quite frankly, I wasn't sure what was in there and I didn't buy it from a BMW dealer, so who knows. I did notice that the old oil filter did not appear to be a genuine BMW part. Having said that, three questions I could use some thoughts on:
1. I swear I can shift the car (6mt) smoother after the oil change - could this be a result of the engine having incorrect oil in it before (non-synthetic perhaps)? The engine just seems more willing to match revs without fuss. Or is this just a placebo effect on my part?
2. Are there any long term consequences for running incorrect oil for a relatively short period of time (5-7k) since the last known dealership service on my car?
3. Is there an easy way to tell if the oil I drained was synthetic?
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