how many miles (km) are on the counter??

Between 200000 and 300000 the headgasket failure (blown) is an ever backcoming issue!!!!

Do you need to top much cooling liquid??

I noticed my headgasket was blown by:
the same symptoms as your car
and
1.0 litre (0.25 gallon) of cooling liquid I had to add every 20 miles!!!!

With a blown headgasket (or nearly blow) during start up, these cilinders (1 or 2)are completely WET!
So in the beginning your engine is only firing 2 spark plugs in stead of 4.
After a few minutes these wet cilinders start also to fire (now they are dry) and the symptoms are gone.=> 2 out of 4 cilinders causes a lot of vibration!!!


No idea about the oil pressure ...

succes
Kkurt



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240 '88 B200K wite sedan 255K km Europe virgo+all turbo gauges, Phoenix Gold + Kenwood ampli, Focal door speakers + tweeters, Kenwood 6'x 9', 10 CD changer in enlarged globe cabinet, dubble rear coil springs , hitch, fog lights, 2 extra rectangular pencil