BMW’s M6 is famous for combining grand touring luxury with track ready performance. From the first E24 M635CSi to the modern F13 M6 Competition, every generation is powered by a special M engine. Those motors deliver astonishing power, but they also require specialist care. When age, mileage or a mis shift ruins the original motor, replacing it with a quality used or reconditioned BMW M6 engine restores your car’s performance. We are the trusted seller for many BMW M6 owners. BM Engine Works sources low-mileage used engines and completely reconditions them in house. We offer fast turnaround, vehicle recovery service, UK wide delivery, engine supply and fit packages and up to 24-month warranty. Our BMW specialists inspect every BMW engine, replace worn parts and test it thoroughly before it is sold. We help enthusiasts and trade customers across the UK save up to 40% compared with main dealer prices while enjoying worry free driving. Whether you drive a classic E24, a V10 powered E63/E64 or the latest S63 twin turbo F13, our team can supply the right replacement unit for your car and let your M6 get back on the road.
The first modern BMW M6 coupe (E63/E64, built 2005–2011, including 2006, 2007, 2008, 2009, and 2010 models) uses the S85 engine. This naturally aspirated V10 has a displacement of 5.0 litres (4,999 cc), a bore of 92 mm and stroke of 75.2 mm. It produces around 373 kW (507 hp) and 520 Nm (384 lb ft) of torque, with a redline at 8,250 rpm and a fantastic engine sound.
The next generation M6 (F06/F12/F13, built 2012–2018, covering years like 2013, 2014, 2015, and 2017) switched to the S63 twin-turbocharged V8. This 4.4 litre engine features two twin scroll turbochargers with a pulse tuned cross engine manifold for continuous exhaust pulses. In the F13 M6, it produces about 560 hp (S63B44T0 variant), while later Competition models reach 567 hp to 591 hp. The S63 engine powers many other M models, including the BMW F10 M5, F12/F13 M6, F90 M5 and M8. BMW improved the engine through updates such as S63TU and S63TU4, which added Valvetronic and higher compression ratios. S63 variants include the S63B44O0 (~553 hp) used in early X5 M and X6 M, the S63B44T2 (~567 hp) used in later M5/M6 models, and the current S63B44T4 (625 hp) found in M5 Competition and M8 models.
Both M6 engines offer exhilarating performance but have known issues. The S85 V10 is prone to premature rod bearing wear. Due to tight tolerances, high revs and limited lubrication, rod bearings can wear at around 80,000 km (≈50,000 miles). Failure to replace them can lead to major engine damage requiring a costly repair. The double VANOS system can also suffer from degraded solenoids and high pressure oil lines, causing erratic performance. Another common issue is throttle actuator failure, where gears inside the actuators wear and cause loss of throttle control. Regular oil changes, preemptive rod bearing replacement and VANOS inspections help preserve engine life.
At BM Engine Works, we supply complete engines for BMW M6 vehicles. Our stock of reconditioned and used engines includes low mileage used engines, fully reconditioned engines and remanufactured engines. We have the perfect spare engine for my BMW. Each engine, whether it is a bare unit or a complete crate engine, is tested for compression, oil pressure and leaks before sale. Worn components are replaced, and the unit is cleaned and painted, ready to be installed in your vehicle. We carry all the S63 V8 variants, including S63B44T0, S63B44T2 and other versions. We offer a supply and fit service in our state-of-the-art workshop. Our expert engine fitters carry out engine removal, fitting and programming using factory equipment, making your engine swap seamless. We also provide nationwide delivery and a vehicle recovery service if your M6 cannot be driven (T&C Applied). Every engine comes with an up to 24-month warranty. We offer used and reconditioned BMW M6 engines at affordable prices, often up to 40% less than when you buy from BMW main dealers. We stock engines for the M6 coupé, convertible and Gran Coupé, plus related models like the M5 and M8. Whether you need a replacement engine, a used BMW M6 engine or a reconditioned BMW M6 engine, we can help.
If your M6 engine has suffered internal damage, a rebuild may be the best option. BM Engine Works offers complete engine rebuilds for the BMW M6. Our rebuild process involves stripping the engine, cleaning all parts and measuring components for wear. We replace worn bearings, pistons and gaskets with OEM parts, with options for a stroker build for increased displacement. We inspect the crankshaft, connecting rods and camshafts. Cylinder heads are skimmed and valves reseated. After assembly, we run the engine on a test rig to ensure proper oil pressure and compression. Rebuilds are performed in house by BMW specialists who have decades of years of experience. We work on S63 V8 engines from F12, F13 and F06 models. A rebuilt engine can restore performance and extend service life at a reasonable price compared to buying a brand new engine. Contact us today to book your BMW M6 engine rebuild.
The engine varies by generation. The E63/E64 M6 (2005–2011) uses the S85 V10, a naturally aspirated 5.0 litre unit producing around 507 hp. The F12/F13/F06 M6 (2012–2019) uses the S63 twin-turbo V8 of 4.4 litres, producing about 560 hp in standard form. Each engine offers distinct character: the V10 revs to 8,250 rpm, while the V8 provides massive torque at low rpm.
The S63 engine powers several BMW M models. Early S63B44O0 units (~553 hp) were fitted to the E70 X5 M and E71 X6 M. The S63B44T0 (~560 hp) powers the F10 M5, F12/F13/F06 M6 and M6 Gran Coupé. Later S63B44T2 engines (~567 hp) are found in F10 M5 Competition models. The latest S63B44T4 engines (625–635 hp) power the F90 M5 Competition and the F91/F92/F93 M8.
The S85’s rod bearings can wear around 50,000 miles if oil changes are delayed. Replacing the bearings and changing oil regularly can allow these engines to surpass 150,000 miles. With proper maintenance, many S63 engines have run well beyond 200,000 miles.
The S85 is a 5.0 litre V10 (4,999 cc) with a bore of 92 mm and stroke of 75.2 mm. It produces 378 kW (507 hp) and 520 Nm of torque. The redline is 8,250 rpm. It uses double VANOS variable valve timing, 10 individual throttle bodies and a quasi-dry sump oil system. Its compression ratio is 12:1.
The S63 is a 4.4 litre twin turbo V8 (4,395 cc). It uses two twin-scroll turbochargers with a cross engine exhaust manifold. It delivers 560 hp and 502 lb ft of torque in the F13 M6. Competition models produce 567–591 hp. The S63TU variants have Valvetronic variable valve lift and higher compression ratios. The engine block and heads are aluminium to reduce weight.
Common S63 issues include VANOS solenoid failures, rod bearing wear, turbocharger failures, valve stem seal wear, ignition coil failures and excessive oil consumption. Symptoms may appear as rough idle, misfires or oil usage. These issues are more common on early engines; later S63TU revisions improved reliability. Regular oil changes with high quality synthetic oil and periodic inspection of the cooling system are important.
Rebuild costs vary by condition and parts used. At BM Engine Works, we provide customised quotes for S85 engine rebuilds. Prices depend on the level of damage, the need for machining, replacement bearings, pistons and gaskets. Contact our team for an accurate quote; we aim to offer reasonable prices without hidden costs.
BMW specifies different oils for the two M6 engines. For the S85 V10, the recommended oil is BMW M 10W 60 high performance synthetic. For the S63 V8 (S63 and S63TU variants), the recommended oil is BMW Group LL01 5W 30, although later model year 2016 engines, including the M6 Gran Coupé and M6 convertible, require 0W 30 LL 01 FE. Always use genuine BMW approved oil and replace it at the specified interval.
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