[john charlton]

It is good you changed the oil but only if you drop the pan now . Most likely you used a modern multi grade which does contain a detergent element . This detergent will break down all the carbon deposits inside the engine and in effect clean the engine internals . The down side is that this crud is now in suspension in your oil ,not good .When you drop the pan you will need to pop out the dipper tray . Various tricks to do this ,the barners will tell you how !!!

John in still no weather today Suffolk County England /