My car is a 2.2DTi on an 04 plate.
Current mileage is 40k, always used 5W30 fully synthetic oil. changed yearly.
I use it mostly on short journeys around town.
At the last oil change although the oil drained from the sump looked perfectly normal for used oil the small amount which drained from the old filter seemed thick and gungy.
Would it be a wise thing,or not, at the next oil change to use a pretreatment, such as WYNNS ENGINE FLUSH before I drain the oil?
Your opinions will be most welcome.