Having read many engine flush threads following a quick search on the topic, it appears that there are many mixed views on this and I want this thread to provide a definitive answer for those considering engine flushes. There are many engine flush products available off the shelf from many motor factors and some are also stocked by main dealers, such as FortÃ© and Wynn's. 1. FortÃ© Advanced Formula Motor Flush: Forte Motor Flush Advanced Formula Motor Flush - YouTube 2. Wynn's Engine Flush: Wynn's Engine Flush - YouTube Some members have also reported that using Diesel fuel 50:50 with current engine oil would also have the same cleansing effect, if not better than an engine flush product. My S3 has now covered over 120k and my current view on flushing the engine is leaning towards a yes, although many members on here have categorically advised against using engine flushing agents as they can cause unwanted damage due to the broken down deposits during this process clogging up oil lines etc resulting in the engine being starved of oil. I do agree to some extent that the broken down deposits following this process may cause blockages, but surely if you are totally removing the sump, deep cleaning anything that's left in there and replacing the oil pick up/strainer, then the likelihood of this happening would be very slim to none? Ideally, I would like technically minded/high skilled mechanics to respond to this thread but anyone's previous experiences with engine flush are also welcomed. Shaun.