I replaced my own plugs. I got NGKs as I really like their quality.
Pros: good quality
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If you’re buying a used VW. This is the easiest one (Polo) to maintain.
1. Figure their parts change and maintenance schedules and follow. Check oil cap for oil type to use (15-20k is fine).
2. Always check oil hoses, rubber seals and gaskets (40-70k).
3. Change engine bushings (100k), chassis bushings (50k), transmission bushings (100k) for first time used buyer.
4. Check condition of all parts above before change, also include spark plugs. Stick to German OEM plugs (50k).
Vehicle:
Volkswagen Polo
I’ll stick with NGK and Denso.
Pros: reliable brands
I run NGK Iridium in my truck, they were like $17 each. That’s just my personal preference, I’m a boat mechanic and we put NGK in everything never had many issues with them except for these newer outboards running a weird plug that seem to foul after a couple hundred hours. I replace the plugs in my truck at like 250,000 miles. I currently have 370,000 on the truck and haven’t changed the plugs yet.
Pros: never had many issues
Cons: plugs seem to foul
Mileage: 250000 km
As an ASE honda mechanic stick to OEM Only which will be NGK lazer Iridum or Denzo Iridum plugs. Cheap plugs foul and cause wear and tear on ignition coils and other electronics. As well but not limited to possible system lean codes and fouled injector tips.
Pros: OEM plugs are best
Cons: cheap plugs foul
Vehicle:
Honda
I bought the absolute cheapest plugs available ($1.50/plug), and they are branded "Denso Toyota Iridium" - I assume fakes, but my magnifying glass does seem to show an iridium tip, and they work great.
Pros: work great
Spark plugs 100k miles - $25
Pros: cheap spark plugs
Vehicle:
Toyota Prius
Mileage: 160934 km
My original spark plugs lasted over 150k km. Replacing them corrected a weird accel issue (power drop on full accel).
Pros: long lasting
Cons: caused accel issue
Vehicle:
Hyundai Sonata
Mileage: 150000 km
Like everyone has mentioned just go back with an ac delco plug. I ran champions and had Mis fires, none of them were gapped right out of the box.
Pros: gapped right out of box
Cons: mis fires, not gapped
autolites are some of the worst spark plugs, grab some NGK iridium’s and it should be fine
Cons: worst spark plugs
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