Quote:
Originally Posted by pak84
I was following a lot of tests in lab from used motor oil. My common conclusion is that the most important is the oil change interval that the oil brand (for street car). Every oil has some advantage and disadvantage vs another, but these oil change intervals 30 000km are killing every advantage and is breaking the engine. It's better to fill some average quality oil for 10 000 km that the best and to change it on 30 000km. I'm using the oem bmw oil.
Other very important thing is the filter- oil and fuel must be oem.
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It is not that simple. It is if you stick to LL01 oils.
Once you venture into "it is synthetic " trouble starts, regardless of OCI.