It’s important to use 8.5 liters of coolant which has Green color. You may use code of motor B6254S and volume figure of 2.5 or just tell the 1996 year of production to buy liquid. Don’t underestimate the importance of Volvo’s 2.9 engine cooling system. Otherwise 960 made in 1991 won’t serve you long enough. There are some conditions in servicing cooling module at Volvo 960.
Use your 2.3 engine longer in 1990 960 by keeping these rules. It will be advantageous to follow Volvo’s rules for 1991 960 service. It’s obvious that every B6304F motor needs good service as stated by Volvo in instruction. So, don’t choose different from Green coolant and obey the number of 10.7 liters.