Proof in the Pudding is in
Brother of The Benz, Grapes
If you intend to keep or just lease?
My 1987 300E spark ignition, has 177,000 miles and has yet to have the engine serviced; not even valve stem seals and she does not consume oil between changes.
I change the motor oil and filter every 3500-4000 miles pumping from the top.I use my "El Cheapo Pump".
She has Mobil I 15w50 motor oil.
This is an example of what preventive maintaince returns.
Make your choice.
Happy Trails Beep Beep from The Spiderman in Houston!!!