More About Points »
Unfortunately, transmission problems are really common these cars. On RepairPal's common problems page, it says "A delay in the transaxle engagement (greater than three seconds) may have multiple causes, including a defective pump, defective internal lip seals, valve body components, the Park Reverse Neutral Drive lever switch, and the output speed sensor." Having a shop check for these problems may save you from having to replace the entire transmission, but it's not a sure bet. Sorry!
That depends on the Taurus in question and what engine it has, as well as the wheels and even tires. I'm sure you can easily get it up over 100 miles and hour, though. Are you thinking of racing? The 2006 Taurus is rated 20 MPG by the EPA.
Auto Zone can be helpful, but they don't employ technicians who can diagnose and resolve problems. Your best bet is to take the car to a shop with a good diagnostic technician who can figure out what the error codes are and what they mean for your car.
This can be tricky, even for experienced technicians. The best bet is to buy a repair manual for your 528. You'll find detailed diagrams and instructions for how to find the fasteners and how to take off the panel. Another good resource are BMW enthusiast forums--you can find car-specific how to do it yourself information.
You can check what expert technicians say about the S420 on RepairPal at http://repairpal.com/mercedes-benz-s420-1997. Mercedes last for a long time, if well-cared for. Maintenance and repair are expensive--it is a Mercedes!--and one of the biggest problems to watch out for are oil leaks.
The best bet is to follow the change interval described in your owner's manual. Many transmissions now use a longer-life fluid and have relatively infrequent interval recommendations. 30,000 miles used to be a good rule of thumb, and it can't hurt to change it sooner than recommended. If you haven't changed the fluid in 50,000 miles, you may well be due. Check your owner's manual or call a Honda dealership.
Intermittent problems with the turn signals can sometimes be attributed to a computer problem. I had something similar happen to me--completely intermittent and strange. I took my car in to the shop, and the onboard computer had every failure cataloged. They had to replace the turn signal module.
Big electrical problems like this are pretty often due to a "module" failing. A module is just any one of the several computers in your car that control everything from the radio to the transmission. Since the car won't start anymore, you probably have a significant failure somewhere in your electrical system. These can be hard to diagnose, so the best thing to do is find a good technician at a good shop who knows GM cars.
I'm not sure how the light could be related to the temperature--it's possible, but it could also be a total coincidence. Your car must still be under warranty, so I'd take it to the dealer and have them pull the trouble code and fix it. Shouldn't cost you anything to do that, even if it's a minor evap problem or if the extreme cold is causing some of the sensors to read conditions out of spec.
The window regulator manages the power window motor's connection to the actual up-and-down action of the window. It's often a cable threaded through a metal superstructure. If the window is down and won't come back up, you probably will have to replace the entire window regulator--I've had the problem in a Nissan and couldn't fix what was wrong with the regulator. Had to get a whole new one.