I have been reading up on a chemical called DMSO, have 500ml arriving in a day or 2. It dissolves organic compounds like nothing else, use very carefully and observe all precautions before opening. Goggles and gloves are a must and rinse any skin contact immediately. Will ruin paint and certain plastics.
Videos online show glazed pistons and rings spotlessly clean after a soak in pure DMSO.
Relatively cheap, 500ml around £20. I will be performing an engine flush with a 5% solution in 10/40w oil followed by 2 more flushes just oil, using the method mentioned here.
https://www.e46fanatics.com/threads/...reply_top_post
Volvo forum in Poland have reported excellent results on the VEA engine, drastically reducing oil consumption.
Will post update after flush.