So my CR-V diesel is 5 months old now and has done 5,000 miles. It's my intention to keep it a long time (now I can afford the higher than expected fuel costs since the fall in oil price). My question is what are the reasons for an engine oil and filter change mid-service? Or is there any real benefit? I am minded to go for a change soon, now that engine is worn in. Or this is a hangover from days gone by when you had an early oil change in a new car?