While having a hardcore performance machine is a tempting proposition for gearheads, actually running and living with one in reality can be challenging. Their stiffer suspension setups can shake your body to its core in a matter of days, and you'll soon tire of having to rev the hell out of it to keep the engine running at its potential while heading to the store for some milk. As a result, many opt for more of a compromise.A luxury coupe with some hidden depths is a good way around this issue, with a good example of such a beast being the BMW M6. It made headlines when it first appeared in 2006 with its screaming V10 powerplant, and it has remained a key part of BMW's lineup ever since. It provides all the luxury touches needed to be a smooth daily when needed, but has all the gear to turn it into an otherwise charming axe murderer at the push of a button. Second-generation examples represent interesting deals at the moment, especially considering the performance they're capable of. An M6 Will Get You Shifting At A Rapid Rate BMWBMW decided to embark on a different direction with the second iteration of its M6 Coupe, the F13. The German marque decided to wave goodbye to the complicated and expensive-to-maintain V10 engine, and replace it with a more powerful 4.4-liter V8 unit. It may have been smaller than the powerplant found in the preceding car, but a pair of turbochargers ensured it was drastically more powerful, with 560 horsepower being channeled to the rear wheels. In terms of transmission, those after a more engaging drive could have a six-speed manual gearbox, while those after a more soothing cruise could opt for a seven-speed dual-clutch automatic instead.It may have been a big luxury coupe at face value, but its low four-second 0–60 mph potential ensured it was one of the fastest cars that money could buy. To go along with that grunt, the M6 was also provided with an active M differential, which could shift the power around to whichever wheel had the most grip. This improved rear traction under power, reducing the chances of wheelspin as you jumped on the throttle on corner exit. In addition, the M6's independent suspension is electrically adjustable, meaning it was able to stiffen up and provide more feedback when left in the performance-focused M mode.Flick it into comfort though, and the whole system is softened off to provide a more comfortable ride. This transition towards luxury can also be found in the cabin. You'll Also Be Kept Comfortable When Your Hair Isn't On Fire BMWBeing a range-topping M6, it comes with all the creature comforts needed to make it an excellent long-distance cruiser. The audio is taken care of by a state-of-the-art – at least for 2013 – Bang and Olufsen setup, while BMW's infotainment system allows access to social media and other apps while on the move. The cockpit is decorated with expensive leather and a range of trim options, which range from carbon for performance-focused owners, and posh wood for those after more upmarket surroundings.Aside from this, the usual high-end options like heated and electric seats, multi-zone climate control, and a full 360-degree camera system are included to ensure the M6 works effectively on the road and track. If you're after a car that teams performance and comfort, you can do far worse than the F13 M6. The F13 M6 Has Depreciated Heavily BMWAs is par for the course with high-end luxury performance coupes, the F13 M6 was damn expensive when it was shiny and new a decade ago. Before you even considered any options, you would have had to hand over $113,400, which far exceeds the budgets of most gearheads in the marketplace. Fortunately, good old depreciation has waved its magic wand to ensure the vehicle is much more affordable a decade on.The average value of the F13 M6 over the last year stands at around $33,000, which is a decrease of 70.8% from new. This also puts it nearly $20k down on the current average price of a new car in the US, placing it well within the reach of most American buyers who can afford a new machine. This outlay will secure a tidy example with around 55,000 miles on the clock too, ensuring you can have a well-looked-after example that still looks pretty close to how it did when it first left the factory.Those looking to save some cash can purchase a car with closer to 100,000 miles on the odometer for as little as $20k, which is pretty amazing value for a car that retailed for more than five times that just 10 years ago. Other Luxury Coupes Are Much More Expensive NissanThis value looks even better when you look at how much you'll have to spend on other performance luxury coupes of a similar vintage. The Aston Martin DB9 VH II, which was produced between 2013 and 2016, still has an average value of around $60k, double that of the M6. It may have a posher badge and was vastly more expensive when it was new, but its V12 kicks out around 50 hp less than the BMW's V8, and it's also slower to 60 mph.The Nissan GT-R isn't quite as luxurious as the M6, but it has all the toys needed to ensure you're comfortable over longer drives. The twin-turbo V6 coupe will run rings around the Beemer in the bends despite lacking on the straights, but you'll have to pay around $80k to get one at the moment. Even higher-mileage examples are attracting price tags of around $65k, or in other words, double that of a similarly traveled M6. The M6's Depreciation Curve Has Smoothed Out, For Now BMWIf waiting a little longer for the car to lose more value sounds tempting, hold your horses. The F13 M6 looks to have reached the bottom of its depreciation curve, and has actually risen in value in the last year or so. The average value of the model dipped below the $30k mark towards the start of 2025, and has risen since then to its current $33k mark. The main reason for this is that the M6 looks to have its natural value, which happens to all luxury cars eventually.Such vehicles tend to be passed around as their rich initial owners spend their money on the latest and greatest toys, meaning their cast-offs struggle to find new owners that'll pay anywhere near what the old ones did new. Ultimately, a car's value only reflects what the market wants to pay, so the F13 M6 has had to reach the point where those happy to buy a used version of such a machine can justify spending their hard-earned cash on it. Factor in the higher maintenance costs associated with such cars, as well as the more restrictive budgets these used buyers possess, and that's why the residual value of vehicles like the M6 has to fall so far before leveling out.That said, it wouldn't be a surprise to see the F13 M6 Coupe start to escalate considerably in the next decade or so. Just over 4,500 examples were produced worldwide, making it extremely rare. Collectors are thus starting to hoard examples now at its current bargain price, before likely cashing out in the future as the market starts to price in the performance potential and rarity of the model. There Are Things To Keep In Mind With The F13 M6 BMWShould holding onto an F13 M6 for future profit sound unappealing, there's nothing wrong with enjoying one as a daily driver. There are things to watch out for should you head down this road, though. If you go for earlier pre-2016 examples, the S63 engine is susceptible to a faulty oil pump, which can cause oil starvation.The result of this is eventual engine failure, which will leave you with a $20,000+ bill. Speaking of oil, the engine is pretty thirsty in this regard, with some examples needing around a liter of oil every 1,000 miles or so. Be wary of checking the maintenance schedule of any car you're looking to buy too, as poorly maintained engines have the tendency to spin their rod bearings, which will leave you needing a new engine for the most part.The rest of the car is generally solid when properly looked after, but that engine can prove more than costly enough on its own if you run into issues. Many of the jobs needed to sort the various ailments are labor-intensive, which equals dollar signs. That said, with a serious machine such as this, buying it without expecting big bills every now and again will leave you sorely disappointed.Go in with your eyes open though, and you'll have a comfortable, rapid, and subdued daily driver that could also be worth a fair chunk of cash in several years' time. As opportunities go, this one is pretty tantalizing.Sources: BMW.