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A set of eight genuine spark plugs for the McLaren 3.8L & 4.0L Engine.

We recommend these spark plugs on Stock, Stage 1, 2 and 3 cars. These plugs come pre gapped ready for installation. The recommended torque spec for these plugs is 30nm or 22 ft-lbs. The recommended change interval is every 10K miles for optimal engine health and longevity. This is an original McLaren part.

Recommended for:

- Stock
- Stage 1 Tuned
- Stage 2 Tuned
- Stage 3 Tuned

Compatible engine codes:

- All M838 engines
- All M840 engines

Compatible models:

- 12C
- 650S
- P1
- 540
- 570
- GT
- 600LT
- 620
- 675LT
- 720S
- 750S
- 765LT
- Senna
- Speedtail
- Elva

Over the years, the electrode wears away on spark plugs, causing too large of a gap and weak spark. Additionally, excess carbon can build up and bridge the gap to negatively effect performance.
Replace yours with these Genuine VW/Audi plugs to regain your power, fuel efficiency, and smooth a poor idle. 

The spark plug is essentially the first step in your engine’s combustion process. It forces electricity to arc across a gap, just like a bolt of lightning. The electricity must be powerful in order for it to cross the gap and create a quality spark. As the piston travels up the first time, compressing the air-fuel mixture inside the combustion chamber, the distributor sends an energy surge along the spark plug wire. When the surge reaches the spark plug, it fires, which ignites the air-fuel mixture. This explosion inside the combustion chamber forces the piston down again and is what creates the engine's Power!

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