Aha so this is the modern equivalent of de-coking an engine (for us oldies
Funny how things seem to come full circle. I'd heard this being an issue on Audi's but first I've heard of it on BMW's. Are all direct injection engines similarly affected then? Since everyone seems to be using direct injection these days, you'd have thought at least one manufacturer would have picked up on this pretty serious flaw in their longevity testing??