Another outstanding Highway Stars product - Highway Stars has CORRECT LINES with high pressure/high temp hoses.

OE oil cooler lines for stock 1986-1987 Buick Grand National, Turbo Regal & 1987 GNX equipped with the factory original radiator and oil cooler adapter.

These lines feature:

High-pressure (400 psi) hoses  (NOT diesel fuel hose)

2 replacement O-ring gaskets

Correct crimps

This set of lines will fit and function as original.    See close up picture of Crimps.
See other picture for installation location info. 

Did you ever wonder why some vendors selling aftermarket engine oil cooler hoses, either don't show a picture of their engine oil cooler lines?   Or, those other aftermarket hoses arrive with the words "diesel fuel hose" stamped on the hoses?   

Warning: Diesel fuel hose is NOT designed for high temperature and high pressure.