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Mercedes-Benz SL 320 Roadster (Series R129) Review “The Thinking Man’s R129 SL” 1994 – 1997

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Mercedes SL320 review

The SL has been the car that all would-be Mercedes-Benz owners have aspired to for more than 50 years. While SLs from the 1950s and 60s have skyrocketed in price over the past 10 years putting them well out of reach of many casual car enthusiasts, there are several SL series cars from Mercedes-Benz that are quite affordable today and offer a huge fun factor in relation to their overall cost of purchase and ownership, not to mention, they’re modern enough to make them reliable and easy to live with as real tools of transportation.

The R129 Series SLs from Mercedes-Benz built between 1990 and 2002 represent a lot of car for not a lot of money. They are more or less fully depreciated at this point and good ones can be purchased for a fraction of their original selling price.

The R129 was available with a variety of engine choices. Initially the two engines offered were a straight 6 cylinder in the 300SL and a V8 in the 500SL, by 1993 an SL600 12 cylinder model was available. In 1994 Mercedes-Benz broke with 40 years of tradition and changed the naming convention for their cars, putting the class letters before the numbers.

Mercedes SL320 engine size

SL 320 straight six engine bay, 3.2 L 24-valve.

For the 1994 model year the SLs were changed to the SL320 designation, now carrying a slightly larger straight six than was previously installed in the 300SL making 220 hp, the SL500 V8 with 302 hp, and the SL600 12 cylinder boasting 389 hp. Of course horsepower isn’t why you buy these cars, they are grand touring machines, not drag racers. I would go as far as to say they’re not even sports cars, they’re comfortable grand touring cars that handle very well. If you want a car to auto cross or take to the track you should buy a Porsche or BMW, something available in a manual transmission.

The car pictured here is the SL320 model, while the smallest engine offered during this SL run, the straight 6 is smooth and more or less bulletproof according to Mercedes-Benz Master Technician Rick Engman at Feldmann Imports Mercedes-Benz in Bloomington, MN.

“Nothing really goes wrong with that engine” says Engman, “you might have to replace the head gasket, but other than that, it’s a strong engine. It’s what they put in most of the E Class cars back then, you can also get it in the old C class, it’s a great engine.”

The R129 cars were a great leap forward from the previous R107 series SLs. The R107 series was produced for 19 years, and therefore holds the distinction of longest production run of any Mercedes-Benz body style. The handling of the R129 cars was a great improvement over the R107s thanks to its multi-link axle that replaced the R107’s diagonal swing axle. Engines improved greatly with variable valve timing, five speed automatic transmissions were available in the new generation of SLs giving them greater fuel economy.

Mercedes SL320 R129 review

Mercedes R129 SL, looks good with the hard top on.

The R129 series SLs are complex, modern cars. They contain, what is claimed to be, the first fully automated soft top in the auto industry, no levers to move or mechanisms to unlock. You simply push the button on the console and the top disappears into the trunk of the car. R129 series SLs were equipped with detachable hard tops made of fiberglass. When looking for one of these cars yourself, be sure to get one with the hard top. They were standard equipment, so if a car doesn’t have one at this point, ii is probably sitting in the back of a previous owner’s garage. It’s perfect for cooler months, when fixed it’s like you’re driving a coupe, you’d never know you were in a roadster. There is virtually no road noise, and the car looks great with the hard top fixed.

Mercedes SL320-review-R129

Inside is neat and tidy, plenty of amenities.

The car pictured here was acquired locally in the Twin Cities for a client in Kansas. It’s a one owner car, with about 54,500 miles, originally purchased at Feldmann Imports Mercedes-Benz in Bloomington, MN as a new car back in 1996. It was purchased and driven to the owner’s second home in West Palm Beach, FL where it remained until 2002 when it was repatriated to Minnesota and driven as a “Summer car”. All the maintenance records were present with the car, it has a clean Carfax and is well known to the service writers and technicians at the dealership. They have gone to the owner’s home each Spring and Fall to take the hard top off and put it back on the car.

The straight six doesn’t make this an exceptionally fast car, but it merges onto the highway perfectly fine, you won’t want for more power while running your regular errands. The straight six cylinder engine is plenty for cruising on the highway, around town and out on country roads. It is smooth and comfortable to drive, the cabin is intuitive and easy to understand, overall a great car to cruise around in on the weekends.

This car was purchased recently with a brand new set of tires and a completed major service for $11,800. Given the full book of records with the car, known history and it’s honest, original condition, in this case, the buyer did very well indeed. Is it a classic? That’s debatable at the moment, but there is no doubt it will be a classic eventually, after all, it is a Mercedes-Benz SL.

It certainly is affordable at this point, included in this car’s records was the original window sticker from 1996, $79,490! Purchased for about 15% of its original value, if the new owner maintains this car and drives it casually a few thousand miles a year he could easily sell the car for the price at which he bought it.

Mercedes SL320 review-R129-prices

Original window sticker… big money in 1996.

When looking for an R129 series SL be selective. Resist the temptation to buy that $5,000 SL “mechanic’s special” advertised on Craigslist. There are few things more expensive than a “cheap” Mercedes Benz. There are plenty of these cars out there so don’t settle for a car if the buyer can’t produce a complete service history. Just over 200,000 R129 SL roadsters were produced worldwide, about half of them came to the U.S. market. They will never be rare cars, or blue chip collectibles like their forefathers from the 1950s, but they are solid cars that can offer many years of happy motoring if you do your due diligence and find a well-cared for example.


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