Let us use a bit of logic here. What is on the other side of the spark plug? The combustion chamber. There is usually NO OIL in the combustion chamber unless you have a completely worn out set of rings. So, if there is no oil on the other end of those threads, how could it possibly be leaking past them?
Putting any type of thread sealer on spark plug threads is simply not useful. The seal is made by either a tapered seat or a gasket. NOT the threads.
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Today's Featured Article - History of the Nuffield Tractor - by Anthony West. The Nuffield tractor story started in early 1945. The British government still reeling from the effects of the war on the economy, approached the Nuffield organization to see if they would design and build an "ALL NEW" British built wheeled tractor, suitable for both British and world farming.
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