Four years ago, I was returng from my hollidays with my Sirion, 6km before my estimated arival at Thessaloniki, my Sirion M100 started to behave strangely. Then I noticed that the car could not go faster than 90Km/h… I pulled over, while I stoped, from the interior the car seemed to be jumping arround! It turned out that my head gasket had been burned out and I had good compresion at only 1cyl! 1cyl!! And I was going with 90Km/h with 1cyl! But, even with all 3cyl working, the car is rough at low rpm. But yeah, Dai’s are really tough!
Where did you find rust? On the engine or in the engine bay? Because I read something about a hole! Can you post a picture of that?