That is a very good question JohnnyB. I will have to ask the
auto instructor J.O. at the Linn/Benton Community College.
If the plug was not installed I doubt it would last 3K miles
(with no oil loss). As far as I know it was installed by
Clearwater. But I will ask.

Ray
In the Pacific Wonderland
95 Montero 5 spd
87 Raider 2.6 5 spd
65 MG Midget
2002 Integra GSR (wife's car)