Originally Posted by blupupher
Good job there.
Problem is today's vehicles just don't require as frequent changes.
It has been 5 years since I have changed plugs, and I did those when my daughter was at school.
my next planned plug change is not for at least 2 more years.
Good to teach them if they want to learn.
But wouldn't biochemistry be better?
I cant teach my wife anymore to be self sufficient. I wanted to do a training session on tire removal spare tire mounting with her Subaru/ But she wouldnt bother.
Then I'll get the call someday she's in the hinterlands with a flat and cant figure it out. And Of I go on some 100 mile resque /repair trek
On plugs. Given hours of operation. Never changed plugs on my Snow thrower in 27 years.
Pulled it once at 15 years - it looked sharp and good. Back in it went.
Not good to disturb the sleeping giants - which is secondary ignition.
Changed the plugs a couple years ago on my 29 y.o. B&S mover. it didnt like the new "easy start" part number ( IMO, the extended tip advanced ig timing too much) So the old one went back in.
Plugs last longer with low oil usage engines and unleaded fuel.
Now off-tuned engine and oil users will need more frequent changes due to earth metals plating out on the insulators and inner shell.
Now moronic Subaru requires a change on the plugs on my wife's 2017 car at 60K miles
BUT It has special fingenail -tip Ruthenium/Iriduim plug which are super long life.
BaH ! Humbug !
I'm leaving them in for another 30K. Car runs great, no misfire.
IMO its a money grab for SOA dealers that's all.
there is an excuse to void my free engine lifetime warranty!