cost oil trap volvo 855

hello sweden friends today I was after I had to find an oil stain under my sweden,in my free workshop his prognoss was oil trap densely wise yellowish slurry on the oil measuring rod squirts when it is cold and has of course an increased oil consumption. it is a 850 t5 with 226 horses bj.96with about 450,000 km tacho has as with most at 320,000 the service quatted. oil presses at various places simerring crankshaft and I believe on the turbocharger out. my free has too little volvo experience to dare to get there. to the cost he could also give me no reasonable information can call me the approximate costs that come to me. he only said oh ever that can become expensive. or someone knows a favorable volvoexpert in the space stutttgart many thanks in advance for your answers…….