I am a new old Buick owner. Just bought a '53 Special in good condition and drove it 175 miles home. Dynaflow works smoothly, but leaks. I see in postings that this is not unusual. Should I leave well enough alone and keep adding fluid or have it fixed? Is this an expensive job? Also, what product should I use to maintain the fluid level? Feel free to respond to email: dadducci@mesirowfinancial.com