MB500secfrench

Hello to all MB enthusiasts,
I'm Christophe from France and I own a 1987 500SEC in France. This car runs great but since some month when I drive it on a inclined road (when car goes down), some oil is burned in exhaust system and it smokes a lot of at rear exhaust pipe ! When you drive it on a horizontal road, all is good. It's the same thing if the car is parked with front down when I start it, it smoke a lot for few minutes.
All engine runs good but I don't know if oil goes directly to exhaust manifold,
or intake manifold and is burned as gas, or maybe a valve problem, or maybe a
anti-pollution system fault, etc....
Someone can help me because I'm very sorry to see my MB coupe like that.
I hope it's not a big problem, next week I'll change oil and oil filter to see
if it change something.
Please can you advise me.
Sincerely
Christophe

MB500secfrench

I'm looking for all technical diagrams or drawings or infos about this engine M117 with oil system and emission control system.