I have a 99 GMC Safari, v6, same problem.
The lines are poor quality.
We get -30C to +30C, lines start weeping after 1 winter, just a drop or two, but d*mn annoying.
1. Measure the distance past the crimping, mine was 14 inches. Measure outside diameter of line, mine was a hair over 1/2 inch.
2.
VERY IMPORTANT remember which lines go where or you will have to crawl under somebody elses vehicle to check. Personal Experience.
2. Go buy #10 Aeroquip Racing Hose or equivalent. and 4 stainless steel hose clamps.
3. Take lines off during an oil change and cut aluminum line just behind crimp.
4. With file or emery cloth clean ends and attach new hose to radiator side. Double clamp.
5. Attach other end to filter side.
6. Add oil, filter and run and check for leaks.
Mine has been on since May 2004, pulled 3500 lb trailer for 8000 KMs during summer in mountains, so far no problems knock on wood.
Steve