vs
Spark plug Autolite or Denso
Denso always.
Pros: good quality
Vehicle:
Toyota
I also went with the IKBH20TTs. I noticed my mpg was better after doing so, and the truck seemed to idle and drive smoother.
Pros: better mpg, smoother idle
Mileage: 95000 km
Part number: IKBH20TT
I ended up going with the Denso IKBH20TT because I couldn’t find any FK20HBR8 at a reasonable price and availability.
Part number: IKBH20TT
Almost any spark plug is better than the Torch it comes with. The recomended is the NGK BP7ES, but is not made any more, many use the BPR7ES without issue, which is a resistor plug, but the manual specifically says to not use a resistor plug. I am using an [Autolite AR52 plug](https://a.co/d/7Z3keDh), it crosses with the stock Torch and NGK BP7ES and is a non-resistor plug. Many people hate Autolite plugs, but I have been using them for years in other vehicles and never had an issue, and so far it is working just fine in my 11500.
Pros: working just fine
Cons: many people hate
Part number: AR52
The spark plug on the right is 10000% original because it's still working even though it's over 5 years old and has more than 87,000 km on it. The new ones show a little over 5 kilo-ohms, which matches Denso's specification. The old ones show a bit over 3.5 kilo-ohms due to wear.
Pros: still working after years
Cons: lettering looks different
Mileage: 87000 km
NGK/Denso are good plugs for my car I used IK20 Denso plugs as they are iridium plugs which is what you want as they last much longer and are better quality
Pros: better quality, last longer
Vehicle:
Mazda
Part number: IK20
I replaced the plugs with DENSO 5358 roughly 10K miles ago.
Mileage: 16093 km
Part number: 5358
I changed my plugs to autolite because I had never heard anything bad about them. I replaced them after 3 weeks due to misfires, put another set of autolites in and it ran fine for 2 weeks. Started misfiring again and swapped in a set of NGK's, no problems since.
Pros: ran fine for weeks
Cons: caused misfires
I would never install Autolite on any car, definitely not the WRX.
Cons: never install
Vehicle:
Subaru
Out of all my years replacing spark plugs. The only times I got bad spark plugs that misfired right away is the one time I ordered a fake set thru ebay(my fault for not doing my due diligence) and a set of brand new auto lites from autozone.
Cons: spark plugs misfired
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