BMW S62 Engine: Common Problems and Maintenance Schedule

Quick Summary

The S62 is a naturally aspirated gasoline V8 fitted to the BMW M5 (E39) and the Z8 roadster. It makes 400 hp at 6,600 rpm and is widely regarded as one of the best engines in the brand’s history. The main risk areas are the timing chain, the fuel injectors, and the turbocharger (on diesel versions). Follow the schedule—oil changes every 6,200 miles, quality fuel, and a warm-up before you drive—and the engine stays reliable. This guide is for current owners and anyone shopping for a car with this motor.

The Problem

You get in the car, hit the starter—and hear a metallic rattle on a cold start. Or the engine idles rough and black smoke pours from the exhaust. These are the classic signs that an S62 needs attention. Without proper maintenance, repairing this engine can cost more than the car is worth.

Symptoms

• Noise at startup and a metallic rattle on cold starts—timing chain wear
• Rough idle, the engine misfires—timing chain or injector problems
• Jerking while the engine runs, especially at idle or under a sudden throttle stab
• Worse fuel economy and black smoke from the exhaust—clogged fuel injectors
• Power loss, blue or black smoke, an abnormal whine—turbocharger failure
• Fuel delivery problems and unusual noise from the pump area—high-pressure fuel pump (HPFP) failure
• Overall performance dropping off, power loss, noise from the turbo area—wastegate wear

Causes

Timing Chain

The S62’s timing chain is theoretically designed to last the life of the engine. In practice, stretched oil change intervals and low-quality lubricants cut that life short. Dirty oil accelerates wear on the chain and its tensioner. A snapped chain means pistons meeting valves: bent valves, a damaged cylinder head, and in the worst case a destroyed engine block. Repairs after a timing chain failure often cost more than an older car is worth.

Fuel Injectors

The injectors are sensitive to fuel quality and prone to clogging, especially in city use with long stretches stuck in traffic. Poor fuel carries contaminants that block the spray nozzles. Run the car too long on failing injectors and you can damage the catalytic converters and oxygen sensors.

Turbocharger and HPFP

Diesel versions of the S62 are known for turbocharger and HPFP problems. Blue smoke points to worn turbo oil seals; black smoke means the mixture is running rich. A whistle usually means an air leak or worn bearings. The HPFP is sensitive to fuel quality—filling up at stations you don’t know cuts its service life significantly.

The Fix

Diagnosis

Don’t put off a shop visit once the symptoms show up. Catching a problem early beats paying for an engine rebuild later. Check the injectors first if you’re seeing jerking along with worse fuel economy.

Fuel Injectors: Clean or Replace?

If the injectors act up, cleaning comes first, and replacement only enters the picture if cleaning fails. Modern ultrasonic baths and cleaning benches strip deposits off the spray nozzles and restore normal operation.

Turbocharger: Used or New?

If the turbo fails, on older diesel BMWs a used turbocharger from a salvage yard is the more economical choice than a new OEM unit. A used one in good condition costs several times less.

Timing Chain Replacement

Timing chain replacement on the S62 is labor-intensive and expensive—but it still beats paying for the damage after the chain snaps. At the first signs of wear—startup noise, a metallic rattle on cold starts, rough idle—get to a shop without delay.

Prevention / Checklist

• Change the oil every 6,200 miles—that’s a requirement, not a suggestion. Use only the manufacturer-recommended oil with the correct viscosity
• Buy fuel only from stations you trust—low-quality fuel fouls injectors and takes out the HPFP
• Run injector cleaner through the system every 12,400 miles—especially if you often drive in regions with questionable fuel quality
• Let the engine warm up before setting off, especially in cold weather, so the oil reaches every component
• Let the engine idle for 1 minute after a highway run—the turbo needs to cool down. Shut it off right after hard driving and the oil stops circulating while the turbo is still heat-soaked, which cokes the oil in the bearings
• Keep up with scheduled maintenance to the manufacturer’s intervals—spark plugs, air and fuel filters, belt and pulley checks

The Bottom Line

The S62 is a reliable, legendary engine—but only with proper maintenance. It demands attention to the timing chain and injectors—and on diesel versions, to the turbocharger and HPFP. If you’re willing to change the oil on schedule, run quality fuel, and stay ahead of diagnostics, the S62 repays you with strong performance and that unmistakable V8 soundtrack. This engine suits experienced owners ready for regular upkeep. If you’re new to BMW, start with a simpler, less demanding engine.