I'd stick with the WR6DPO Bosch. Not sure why but they just work with no questions.
Ive tried other plugs that are oem spec but not from VW and I like the way the oem plugs work better.
Bosch Plugs are tops in any application you use them for... All of their parts are worth what you pay for them...I've...\"NEVER\" had a Bosch part of any kind to fail at its applied usage...! True top of the line German Engineering... period...!!!!!!
I used Bosch plugs in mine about 3 months ago and I couldn't be happier.
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).
I recently just replaced my spark plugs they were past due. So I bought the OE Bosch 9683. The engine runs fine, starts easy, no misfiring, no rough running. But after the plug change I am getting much worse millage.
Also, some engines get particular about plugs. Bosch has a bad rep for the 3400 engine in my Grand Am, while NGK and AC Delco(I've got NGK Iridium IXs in there now) are fine.
definitely avoid Bosch spark plugs. I'm not personally a fan and I've seen plenty fail. Unless they were original in the motor (usually Subarus don't use Bosch), I'd stick with NGK or Denso in my opinion.
Bosch spark plugs are also trash.
Those spark plugs are junk, and on top of that, they are now carbon fouled. I would strongly encourage you to install new, normal, spark plugs.
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