Most of us didn't grow up with DI BMW's because they did not exist. They were washed with injectors at the front of the head. I don't know if most people expect not to walnut blast. But every 25-40k is undesirable. If it was, say 60-80k that would be far more reasonable.I think the majority of people that invest in this setup expect to not have to walnut blast going forward, and that is pretty far from the truth, even on a 100% healthy engine and turbo setup that's not pushing oil.