Opel Record E

Hello together Looking for a new car I came across an Opel record E BJ 1985 with 2.2i engine and 83,000km. Looks optically still really top My question is now, what are there in this car for weak spots and what can it cost with 2 years tüv. also an important question would be how much it is built up, have Googled there already and there came values of 8-13l on what is already happig. Is there a cold running controller to retrofit anywhere? mfg