Hi guys, have a question to ask, a mate of mine has a E reg w124 300d,has to do about 4-5 miles every day for school runs (return trip) takes between 25 - 40mins(depending on traffic), he works from home, has to park the car untill evening and do the same in the evening.the question is will that short trip be harmful to the 300d, or because it takes 30mins on average it is ok. -Is it the short milage that harms or short period of running the vehicle????, Can anyone assist on this, thanks.If it is harmful what does it affect apart from the exhaust??, also does that mean he has to get oil changes more often? - Bear in mind in between the week there are sometimes 2 - 3 days that will have a run of more than 10 miles per day, weekends are different-does take it to motorways.(recently purchased the merc and loves it to bits,wants to look after it)