I have a 1987 Olds 98. Over the last month when the weather is cold in the morning(about 20-35 degrees) I have been having some transmission problems. When I start the car in the morning for the first time and start driving, it will not change gears for about a couple of minutes. It just stays in the first gear and doesn't shift until, apparently, it has warmed up a bit. It doesn't have a problem shifting. It just doesn't change gears until warmed up. After a couple of minutes of driving, it starts working ok and I have no other problems until the next morning when I start off cold again.
Several additives have been suggested. A friend suggested Trans-X Stop Leak & Tune-Up and my local parts store recommended Lucas Transmission Fix.
What should I use? Any suggestions will be appreciated. Thanks