Long shot. Not long after I had my 1994 G 300 petrol, it was dripping oil on my drive. A new head gasket was fitted and the dripping abated. A bit. However. 12 months later. It still deposits oil drips. Not a lot but enough to annoy. It has 5w 40 oil in it - as per modern MB Does anyone know what MB specified when it was new and would thicker oil not be able to exploit leak prone areas in an old engine?