BMW M4, M3 & M2 Across Generations: G82, F82, E90, G87 and F87

The E90-generation M3 is the one that still gets talked about in hushed tones, and for good reason. That S65B40A is a 4.0 litre naturally aspirated V8 revving past 8,000 rpm, producing 420 hp and 400 Nm with a 12.0:1 compression ratio and bore and stroke dimensions of 92.0 mm by 75.2 mm. Every dimension is tuned for free revving response rather than lazy low end grunt. It's dramatic, mechanical, and genuinely unique in the M lineup. But theatre comes with consequences, and this engine has a few that every owner needs to understand.

The most talked about issue is rod bearing wear. The S65 can wear its rod bearings prematurely, particularly when oil change intervals are stretched or the car sits at idle for extended periods after hard use. The bearings show copper exposure before they fail completely, and by that point the damage is already spreading. The fix is a bearing refresh with fresh OEM shells, and it's genuinely worth scheduling before the noise starts rather than after. We also see the throttle actuators causing grief, throwing the car into limp mode without much warning. Each cylinder bank has its own throttle body system, and when the actuators wear or fail, the MSS60 ECU reads the discrepancy immediately. VANOS solenoids and the high pressure oil pump are also on the watch list for higher mileage cars.

When BMW launched the F87 M2 with the N55B30T0, they gave a compact rear drive coupe 370 hp and 500 Nm from a 2,979 cc single turbo straight six with a 10.2:1 compression ratio and bore and stroke of 84.0 mm by 89.6 mm. Coming off the back of the naturally aspirated E90 M3, this was a very different proposition: a smaller displacement, forced induction, and a character built more around instant torque than high rpm drama. It's a brilliant car to drive, and the N55 is a strong, well proven engine, but it has its own set of weak points to know about.

The electric wastegate actuator is probably the first thing to flag. It's prone to rattling or failing outright, and when it goes, boost control becomes erratic. Oil filter housing gasket leaks and valve cover leaks are extremely common on the N55 as the seals age, and you'll often smell or see oil pooling before any fault code appears. Charge pipes and boost hoses cracking under load is another one we see regularly, particularly on cars that've been driven hard. The VANOS solenoids and eccentric shaft sensor can throw codes and affect power delivery, and the water pump and thermostat are worth inspecting on any car over five or six years old. Carbon build up on the intake valves is a direct injection issue here just as it was on the E90, and walnut blasting is the proper fix.

BMW didn't sit still with the F87. The M2 Competition arrived with what is effectively an S55-derived version of the N55B30T0, same 2,979 cc capacity and 10.2:1 compression ratio, same 84.0 mm bore and 89.6 mm stroke, but now producing 450 hp and 550 Nm. That's a substantial 80 hp step over the standard F87 M2, and the character of the car shifted noticeably with it. The Bosch MEVD17.2.G ECU is common to this generation, and the engine brings with it most of the same fault patterns as the standard N55 car but amplified somewhat by the higher output and the way Competition owners tend to use them.

Carbon build up on the intake valves is just as relevant here as it was on the standard F87, a direct consequence of the direct injection setup. Charge pipe cracking is arguably more likely given the higher boost pressures and the way these cars get driven. Oil consumption, VANOS solenoid wear, and oil filter housing gasket leaks all carry over directly. The crank hub is a discussion worth having before significant power modifications on any of these S55-family motors. And cooling system health matters more than ever at 450 hp; the system is working harder and the consequences of a failing pump or thermostat are more severe.

The practical difference between owning a standard F87 M2 and the Competition comes down to expectations: the Competition is closer to M4 territory in terms of how hard it works its drivetrain and cooling system, so the maintenance discipline needs to match.

The F82 M4 arrived as the spiritual successor to the E90 M3, which was always going to be a difficult transition. Replacing a naturally aspirated V8 with a twin turbo 3.0 litre S55 straight six producing 431 hp and 550 Nm made sense on paper, and on the road the F82 is genuinely fast. But the S55 brought a new set of concerns that the S65 never had, and some of them became well known within a few years of the car launching. If you're shopping the F82 used, knowing what to look for is essential.

The charge pipe is probably the most talked about F82 fault. The factory plastic pipe can split under boost, and it often does so without warning at the worst possible moment. Many owners and workshops replace it with an aluminium unit as a matter of course. The crank hub is more significant: on the S55, the hub can slip and throw the timing out, which is catastrophic if it goes unnoticed. It's worth checking on any higher mileage F82, and absolutely worth discussing before a tuned car is pushed harder. Carbon build up on the intake valves is a direct injection reality here just as it was on the N55, and walnut blasting periodically keeps the intake clean. Oil consumption and rod bearing wear are also things experienced F82 owners keep an eye on.

The G82 M4 is what happens when BMW takes the lessons of the F82 and builds something properly engineered around the high output twin turbo formula. The S58 3.0 litre twin turbo straight six produces 480 hp and 550 Nm in standard Competition trim, managed by a Bosch MG1CS049 ECU. The combined direct and port injection setup addresses the carbon build up issue that plagued the S55 and N55 generations, so walnut blasting is significantly less of a concern here. The charge pipe situation is also improved. But the S58 is not without its own demands.

Heat management is the recurring theme with the S58. This engine works hard, and under sustained track use or in warm weather, the cooling and charge cooling systems are under real pressure. Oil quality and interval discipline matter more here than on any previous generation: the S58 turbos and bearings are asking a lot of the oil, and degraded lubricant shows up quickly. The high pressure fuel system and boost control are worth checking on any car that comes in running rough or down on power. Spark plugs and coil packs still wear under boost and need replacing on schedule, even though the carbon situation is improved compared to the S55. Crankcase ventilation behaviour is also worth monitoring on higher mileage cars.

Compared to the F82, the G82 is more refined, more electronically complex, and considerably more powerful at Stage 1. The S58 is genuinely a better engine than the S55 in almost every measurable way. What you give up is some of the rawness that made the F82 so engaging. For most owners that's a very easy trade.

The G87 M2 takes the same S58 twin turbo straight six that powers the G82 M4 and puts it in a more compact, lighter body. The result is 460 hp and 550 Nm, managed by Bosch MG1CS024 and MG1CS049 ECUs alongside a ZF 8HP controller where the automatic gearbox is fitted. If you're wondering why the G87 outputs slightly less than the G82 M4 Competition, it's calibration and cooling management rather than any hardware limitation. The engine is essentially identical, which has significant implications for both the fault profile and the tuning potential.

Heat management under hard use is the primary concern with the G87. The S58 in this lighter, more focused body sees track use more frequently than many M4s, and the cooling system has to work accordingly. Oil consumption on some cars, high pressure fuel system integrity, and charge pipe condition are all worth checking, particularly on cars that have seen spirited driving. The S58's strength is that it doesn't have the charge pipe weakness of the S55 or the carbon build up of the N55, so the fault profile is cleaner, but the stakes of neglecting heat and oil management are higher given the outputs involved. Cooling system condition, oil quality, and spark plug intervals are the three priorities.

Between the G87 M2 and the G82 M4, the engine is the same story. The choice comes down to body style, driving character, and whether you want xDrive or are happy with rear drive. For tuning potential and driving engagement, the G87 in the right hands is arguably the pick of the current generation.