Join Date: Nov 2014
Location: Atlanta, GA
Drives: '15 SX, '19 Stinger GT2 AWD
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They are useful in motorcycles because they (mostly) share a common oil system for both gearbox and engine. The gearbox will shed material over time.
In a car, there is very little chance of anything ferrous being shed unless something disastrous has happened, and the magnetic plug won't make any difference...