I ordered (from Rock Auto) some NGK spark plugs (#95463) advertised as being "OE Series." This supposedly means they are built to match the OE specifications.
I went with Denso's on my 1.8T because that is what I had on the shelf. but I have ran anything and everything in vehicles over the years, and found that there is not much different between the different types.
FWIW, I just had spark plugs and coil packs done on my 2016 Jetta, $185 out the door at my local dealership
I ended up leaving them as is and the car seems to be working fine.
Update: went Bosch for the plugs and ngk for the coils, the manufacturer plugs and coils were still in as if no one has touched them since the car was bought, I’m the third owner I believe. Each spark plug was toasted, easily double the recommended gap, and once I put the first two coils in (pulled code P0300, P0301,P0302) the problem entirely went away (coughing and sputtering exhaust, slow to accelerate, car shaking between 20-40 mph, rough starts) so I knew it was a go ahead for the rest of the coils. Feels like a whole new car all around, I can tell the engine is thanking me by what she’s putting out now ????
My 2017 Jetta SEL with LFER7BHX 9512 plugs starts/runs fine at 50076 miles, 0-100 degrees F.
So new Bosch plugs and red-top coils seemed worth the $109. Old spark plugs were pretty crusty, which made me feel better about doing it.
I’ve done an oil change as well as swapping the spark plugs and coils for brand new ones. The roughness persists!
Lesson learned: DO NOT EVER EVER EVER USE BOSCH PLATINUM (STANDARD TIP) SPARK PLUGS IN YOUR VR6 ENGINE.... THEY JUST DON'T WORK!
Don't go with Autolite XP iridium. I had on my Jetta and one of the tips basically melted after 25k. They suck.
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