It’s important to use 7.8 liters of coolant which has Green color. Otherwise 944 made in 1985 won’t serve you long enough. There are some conditions in servicing cooling module at Porsche 944. In 1989 the company produced vehicles with 3.0 engine having code of M44.41. Make sure you service system at Porsche with installed 2.5 engine correctly.
Use your 2.5 engine longer in 1988 944 by keeping these rules. So better use Porsche’s advice for servicing 1985 944. To endure car life take only Green antifreeze and pour not more or less than 7.8 liters. It’s obvious that every M44.08 motor needs good service as stated by Porsche in instruction.