What do you pay attention to when buying a used PT Cruiser convertible?

Hello to the Chrysler municipality… I love buying a PT Cruiser Cabrios, BJ 2004, 40,000km, 2.4 Limited, Handschaltung. Are there certain points that should be particularly considered with the PT Cruiser? A used car check is coming soon. When looking under the bonnet, I noticed two things that made me feel a bit thoughtful: 1) around the lid of the power steering fluid and also on the lid was partly a thick oil spill Is it possible to get out of here with a leak or has someone just filled up very uncleanly? 2) The coolant was at a very low level (with Add). Does the PT Cruiser have a high consumption here or does this low level speak for a defect of the vehicle? Are there any other known weak points of the PT Cruiser, which you should have in mind and to which the TÜV people are best addressed at the used car check? I am thank you for every hint. r, also by PM… Best regards Michael