Bosch W6DPO. They’ve always been expensive, but now stupidly so. I’m not paying $250 for plugs, either. The DENSO IW20TT you referenced is a perfect replacement because it’s the exact same heat range as the W6DPO.
Denso and NGK have fared better than Autolite in my vehicles in my experience.
I owned my cruze for 5 yrs and had no problems with the NGK iridium. I paired it with a coil pack I ripped out another cruze.
I use NGK on my supercharged Roush. The recommended for supercharged engines is 28 to 30k miles. The only thing that you need to research with the e85 tune is whether or not you need a hot plug or a cooler plug. Roush calls for a cooler plug
I actually had a generator that would take 4-6 pulls to start with the "Torch" brand sparkplug, but starts in 1-2 pulls with an NGK.
BP7ES is what I have in my Wgen. Cranks 1st turn over everytime now since I switched and instead of rolling over 10-15 times with the crappy Torch plug now takes 1 second.
Quicker starts is a result...I just followed the crowd on this one and from my days at NAPA, i was a NGK and Bosch spark plug fan back then.
I changed my own with about 50 US in tools. Its a pain to do without dropping the motor down which i didn't do.It took me about 3 hrs for 4 plugs. Replaced with nkg plugs at about 25 each. I have the tools and know how but I'd probably pay someone 500 dollars to not do it again. It was an eye opening experience.
Just replaced the OEM ones with the NGK PLFER7A8EG 94833 as part of my 40k service on the car. Pretty straightforward like usual except the hard part is maneuvering the coil pack connectors that rest again the intake pipe because of the plastic covering that thing was such a pita. But now the car feels like heavy, like when you put on some heavy wheels on and you can tell the difference right away. I've been having to be so light in the gas pedal because it would fly. Now it feels like I really have to push the pedal a lil harder then usual to pick up speed but it just feels heavy kind of (not sure it's the best description) but it's it not hesitating at all.
I replaced the spark plugs with NGK Iridium IX factory gapped to .044". Everything went smoothly, reinstalled coils, air box, battery, connected MAF, and started the car. Now it is shaking, smoke coming out the exhaust, and blinking check engine light.
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