the anti garage queen a 5 5 liter stroker m5 built to fix bmws v10When BMW unveiled the E60 M5 in 2005, it felt like an act of glorious hubris. Sandwiched inside an understated executive saloon was the S85-a 5.0-liter, 8,250-RPM naturally aspirated V10 born directly out of BMW's Williams Formula 1 program.It remains one of the most intoxicating powertrain experiences ever put into a four-door chassis.However, the S85 had famous Achilles' heels: tight rod bearing tolerances that could destroy the bottom end without warning, finicky throttle actuators, and the notoriously fragile single-clutch Sequential Manual Gearbox (SMG III).AdvertisementAdvertisementMost owners react to these factory flaws by coddling their M5s in climate-controlled garages, terrified of the repair bill. But some take a different route: they strip the engine down to its bones, engineer away every single factory weakness, add displacement, and build a machine meant to be driven hard.That is precisely what we have here. Located in Herndon, Virginia, this 2008 BMW M5 listed for sale in the AutoGuide Classifieds at $42,000 is a masterclass in how to bulletproof BMW's greatest engine.the anti garage queen a 5 5 liter stroker m5 built to fix bmws v10The Legend of the Troy Jeup BMW StrokerIn the world of S85 engine builders, one name carries legendary, albeit controversial status: Troy Jeup. While most modified E60s feature a mishmash of bolt-on exhausts and off-the-shelf software tunes layered over stock internals, this single-owner M5 was shipped to Jeup with a singular focus: build the ultimate version of the V10.At 101,373 miles, engine build #387 was installed. Jeup stroked the engine from 5.0 to 5.5 liters, bumping compression to a razor-sharp 13.2:1. To solve the S85's notorious thermal and oiling issues, the build was packed with heavy-duty endurance hardware:AdvertisementAdvertisementThermal Management: DiamondEye thermal-coated piston crowns, a Dodge Viper 205°F thermostat to drop operating temps, DEI exhaust heat wrap, and a dual-nozzle Snow Performance water-methanol injection system.Oiling Overhaul: Upgraded KING Race rod bearings, micropolished crankshaft, a custom Active Autowerke oil bypass, an external Amsoil secondary filtration system, and Dimple magnetic drain plugs.Flow & Exhaust: Ported cylinder heads feeding into RMS v-band headers. The removable catalytic converters are currently off, unleashing an uninhibited F1-grade exhaust note.the anti garage queen a 5 5 liter stroker m5 built to fix bmws v10Fixing the SMG and Total TransparencyPower is useless if the transmission can't deliver it. The 7-speed SMG gearbox in this M5 was completely rebuilt at 125,700 miles by RRT (Road Racing Technologies) in Sterling, VA-a shop renowned for their specialized BMW race prep and SMG expertise.With new clutch components, flywheel, solenoid O-rings, and a custom bronze guide pin, the gearbox has just 35 miles on its fresh build.What truly elevates this classified listing is the sheer level of documentation. The seller is the original owner who ticked every factory option box in 2008-including full Merino extended leather and active bolster seats. Rather than hiding the car's 125k-mile chassis history, they provide full itemized receipts for the 74 total hours of engine labor, a paper trail from day one, and even include a laptop loaded with BMW's official ISTA diagnostic software and cable for the next owner.the anti garage queen a 5 5 liter stroker m5 built to fix bmws v10The Ultimate "No Excuses" S85?An asking price of $42,000 places this car above typical 100k-mile E60 M5s, but comparing this to a stock market example is a mistake. Building a 5.5L stroker engine with Troy Jeup, upgrading the oiling, refreshing the accessories, and having RRT rebuild the SMG easily eclipses $30,000 to $40,000 in parts and specialized labor alone.AdvertisementAdvertisementThis isn't a garage queen preserved under bubble wrap; it's a fully sorted, 5.5-liter atmospheric monster built by the best in the business. For the enthusiast who wants the unsilenced scream of a high-compression V10 without the constant anxiety of rod-bearing failure, this Herndon M5 is about as good as it gets.Become an AutoGuide insider. Get the latest from the automotive world first by subscribing to our newsletterhere.