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Exactly, ad this is why I was wondering if suction would get more of the old oil out. Take a look at the stupid design of the sump, the drain plug is recessed into the sump so there is no way all the old oil can drain out, no wonder the engines run into the problems they do.No it's because the engines are a nightmare for oil carbonisation, and suction method cannot get it all out.
The old stuff that remains turns into sludge and solid carbon, this generally then breaks down and gets sent around the system and clogs up turbos etc
I have changed the oil in it every year, but it is 11 year old now with 66 on the clock, I'm trying to look after it as I would like it to keep going. I may drop the sump next year and see what its looking like.