Engine compartment squirts at operating temperature

Moin moin, And I have the problem at the moment that if I drive my elk at operating temperature and then stop that my engine room starts to smoke and stink as if someone was grilling. And indeed I had an oil change a few weeks ago (for lack of time this time not made itself) and there it started already. They have washed with the oil and everything was full oil made everything clean with brake cleaner and drove 2 days,doert also everything went well. Well h This happens even if the engine is warm. The smell only occurs when the car is standing and the engine temperature is never over 90 degrees. I hope someone can help me further what it might be where I should look. Mfg