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04-08-2010, 04:18 PM
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#22 |
 Drives: '08 Yaris LB 5M Join Date: Nov 2008
Location: MN
Posts: 31
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Another reason for dielectric grease inside the plug boot (besides a gas and moisture tight seal) is to prevent the plug boot from becoming more or less permanently bonded over time to the spark plug insulator. It's just another little detail that separates the craftsmen from the workmen.
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