My great uncle is graciously giving me his early 80s VW Rabbit Diesel, naturally aspirated, manual transmission. Not entirely sure of the year, I'll find out when I get it this weekend. I have only owned gasoline cars so far, but I'm excited to dive into the world of diesel. Anyways, does anyone have experience with oil for this car? What about OCI and oil filters? Are there any other common maintenance items I should get a head start on with this particular car? Obviously it's ~30 years old, so I know it will need some TLC. Thanks in advance for your advice.