Is that the 1st time you changed plugs??!! The plug change interval is 30K miles. And I hope you are changing your fluids more often than 100K miles.

Most people just use the NGK's or the Denso's once they do the 1st plug change.

hupptoy


99 4Runner SR5 3.4 Auto 4x4, 32" LTX A/T, 154K
93 Toy x-cab 22RE 5-spd 4x4, 31" LTX A/T, 150K