The transmission fluid should have been replaced 4 years ago. So every 77,000 miles or 5 years (by memory). Spark plugs every 30,000 miles or 2 to 3 years. ESS tells this. The previous owner has nothing to do with this and certainly was not sparing money. The condition of the car proves it, it is immaculate and in a show room condition. Acting on the recommendation of a garage who has a B only policy, as told to me by them on the phone. There are well known and clear servicing intervals for Mercedes. The rest is an aberration from it.