BMW M2 (F87, G87): Guide to the S55 and S58 Engines

Quick Summary

The BMW M2 is a compact, rear-wheel-drive M coupe. The F87 generation (2016–2021) came with the S55 (365–410 hp); the new G87 (from 2023 onward) carries the S58 (460 hp). Both are twin-turbo inline-sixes, but their weak spots differ. The main risks: rod bearing wear and high oil consumption on the S55, carbon buildup on the intake valves of the S58. This guide is for M2 owners and used-car shoppers.

The Problem

Shopping for a BMW M2, or already own one? Behind the driver-focused character sit engineering nuances the dealership won’t mention. The S55 and S58 are masterpieces, but without proper maintenance they turn into an expensive headache. Here’s where the M2 hurts, how to diagnose it, and what to do to avoid an engine rebuild.

Symptoms

• A knock from the bottom of the engine under load — worn rod bearings
• Oil consumption of up to roughly 1 quart per 620 miles when driving hard
• Sudden overheating — water pump failure with no warning
• Clunks from the front suspension over bumps — worn bushings and struts
• Power loss and misfires — deposits on the intake valves
• Burnt clutch smell on hard launches in the manual

Causes

S55 — a 3.0-liter twin-turbo inline-six with Valvetronic and Double-VANOS. In the F87 M2 it makes 365 hp; in Competition form, 410 hp. The main pain point is the rod bearings: under sustained high loads, especially on track, they wear. It’s not a question of “if” but “when.” The second issue is high oil consumption, a product of the piston assembly design and high temperatures.

S58 — the S55’s evolution for the G87: a stronger block, new pistons, a closed-deck design, 460 hp. The engine is more reliable, but it suffers from carbon buildup on the intake valves — a side effect of direct injection.

Both engines pair with a 7-speed DCT or a 6-speed manual, and drive goes to the rear wheels through a limited-slip differential.

The Fix

S55 rod bearings — preventive replacement every 25,000–37,000 miles. It’s standard maintenance, not a repair. Plenty of owners do it right after buying the car. Skip it, and the outcome is a knock, major engine work, or a replacement engine.

Oil — 10W-60 to BMW M specification, nothing else. It costs more than standard oil, but it protects at high temperatures. The change interval is every 3,000–4,000 miles. Skimping on oil leads to expensive failures. Fresh oil before a track day — and after one is mandatory.

S55 cooling system. The water pump can fail without warning, and leaks are common after 31,000–37,000 miles. Replacing the water pump and thermostat as an assembly is the preventive move.

Transmission. DCT and differential fluid every 19,000–25,000 miles. On the G87 manual, the clutch suffers from aggressive launches — check its condition before you buy.

Brake fluid — every 2 years, or once a year for track use. Moisture-laden fluid boils under hard braking.

S58 intake valve cleaning — every 25,000–37,000 miles (media blasting or chemical cleaning).

Prevention / Pre-Purchase Checklist

• [ ] Paperwork for rod bearing replacement on the S55 — if there is none, budget for it
• [ ] Oil change interval no longer than 3,000–4,000 miles — anything longer is a red flag
• [ ] Track history isn’t a negative if the car was prepped: frequent fluid changes, brakes, tires
• [ ] Clutch condition on the G87 manual — how many track days, how often it was replaced
• [ ] Oil consumption between changes — high consumption means it’s time for diagnostics
• [ ] Rear tires on the M2 Competition — driven hard, they’re done in 3,000–5,000 miles

Bottom Line

The BMW M2 is one of the best modern driver’s cars. The F87 with the S55 is already a cult classic, but it demands attention to rod bearings and cooling. The G87 with the S58 is more powerful and more reliable — and pricier. The main rule: don’t cheap out on maintenance. Regular oil changes, preventive rod bearings, and timely transmission service are what keep your M2 alive for the long haul.