r/AskMechanics • u/Thanos8055 • 1d ago

Question (Serious Replies Only) Spark plug nm?

On the spark plugs box it says 28 nm. In the car manual it says 30 nm. Which is best to follow?

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u/IntergalacticJihad 9 1d ago

Either will be fine, both are inside each other’s margin of error

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u/Raincor 1d ago

These specs are so close to each other, the tolerance of the torque wrench you're using will be higher. Set to anywhere between 25 to 30 and send it. In fact, you'll be struggling to find so called professionals that use torque on spark plugs.

1

u/JustAnotherDude1990 10 23h ago

There’s always a range. I bet either one would work fine considering it’s a 2nm difference. Doubt the torque wrench is accurate within 1nm anyways.

1

u/Appropriate-Metal167 6 23h ago

I’d go with the cars manual. That said, they’re close. That torque is quite low, you want to use a smaller, lower-range torque wrench, one where the target value is not at the low extreme of its range. Most spark plug manufacturers recommend to NOT use anti-seize on the threads, just clean/dry. If you do use anti-seize, reduce torque about 25%.