There are some conditions in servicing cooling module at Volvo 760. Otherwise 760 made in 1990 won’t serve you long enough. Only Green antifreeze type is suitable and you’ll need 9.3 liters of it. You should be careful at choosing liquids for Volvo especially for vehicles having 2.4 motor. In 1987 the company produced vehicles with 2.3 engine having code of B230FT.
A lot of B280E motors are used long in Volvo cars but only with good service. 2.8 760 motors of 1990 year will serve more by optimal service. So, don’t choose different from Green coolant and obey the number of 9.3 liters. There is a big plus in servicing 1989 Volvo 760 with all regulations.