Excellent, but there is one section missing re flushing oil.
One numpty at work was told that if he flushed the engine out it would be better.
He didn't use flushing oil, he just drained the oil, left drain plug out and put a hosepipe in the oil filler and turned the tap on for 10 minutes...... i kid you not.
when finished he filled it up with oil again!
I've never seen a diesel astra van produce so much white smoke before it died.......