There is a 1-row aluminum core radiator identical to the F-body that has an engine oil cooler built-in to the DRIVERS side (you'll need longer hoses):
ACDelco 20903 $202 carparts.com
GM 52477477 $181 gmpartsdirect.com
Spectra-Premium CU1272 $227 rockauto.com
Visteon 9218
Application is 89 Buick Century with 2.8L and engine oil cooler or 1985 Century w/ diesel.
ACDelco 20903 $202 carparts.com
GM 52477477 $181 gmpartsdirect.com
Spectra-Premium CU1272 $227 rockauto.com
Visteon 9218
Application is 89 Buick Century with 2.8L and engine oil cooler or 1985 Century w/ diesel.