So what is this Walnut Blasting, which BMW’s requires this service, why do I need the service, and what is the cause. These are common questions we get here at Ultimate Bimmer Service so we decided to post some helpful info on carbon build-up and the required removal.

For starters ONLY BMW’s with direct injection are affected by this issue. BMW first offered direct injection here in the US markets with the 760Li E65/66, and more popular in the 2007 335i models. Following we have listed the BMW engines and models with direct injection. Current and past BMW direct injection …