I have a car for each category.
The most reliable car that I've ever owned and still own is actually a truck. It's a '93 Chevy Silverado Ext-Cab with a 350 that I've owned since new and it's never let me down once. It just turned 120K today and still runs and drives like the day I bought it.
Now for the car I've owned the longest is a '51 Cadillac HT coupe. I've had it for almost 19 years. I can't say it's the most reliable since I never really drove it as a daily driver. It has started every time I got into it and I've never had to replace anything except the battery.

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DJ


84 300D Turbodiesel 190K with 4 speed manual sold in 03/2012