Changed spark plugs on the Matrix.
Only 57K miles, but after 10 years I worried about the threads sticking.
Otherwise they could have gone much further.
Old threads looked and felt grungy coming out, but were OK.
New (Denso):
Old(NGK):
I also checked valve clearances.
One intake at the loose limit, others in spec.
Only 57K miles, but after 10 years I worried about the threads sticking.
Otherwise they could have gone much further.
Old threads looked and felt grungy coming out, but were OK.
New (Denso):
Old(NGK):
I also checked valve clearances.
One intake at the loose limit, others in spec.