Touareg: 2014 V6 TDI
Join Date: Aug 2018
Location: KW, ON, Canada
Second Vehicle: VW 2
Thanked 52 Times in 51 Posts
Recommended replacement intervals are suggestions, especially for something like plugs.... If your plugs are that worn that it's causing missfires, you should've had plenty of warning signs prior to that point... Your MPGs and power delivery would've declined, etc.
Depending on vehicle, engine, performance and typical use, I change plugs at different times.....
Lawnmower and Snowblower
- change plug when I can no longer start them
- change plugs every season
Turbo summer toy
- change plugs any time I suspect a missfire or loss of performance
- never 😉
I also always use copper plugs... None of this platinum crap that's made for people who want to get 100k out of the same plugs and stuff..... But that's just me and to me it's a daily inexpensive consumable that I don't mind changing at the drop of a hat.