Bosch should be the safest choice for German cars, but avoid their gimmicky "Plus 4" plugs that have 4 ground electrodes, unless that's what the car came with from the factory.
Bosch provides OE for VW spark plugs. Plug your vehicle into autozone and just buy the bosch ones. They come pregapped.
Autolite a103 gapped to .055" will give you about a 5hp increase and last around 30,000 miles
Oil change at 123k miles \ufffd\" OEM filter and Castrol Edge 5w40 OEM air filter at 116k miles OEM cabin filter at 116k miles OEM Bosch spark plugs at 116k miles
My plugs seem to still be running great, only have about 35,000 kms on them.
But otherwise, Bosch FLR8LDCU+.
This is why I don't use Bosch plugs. It goes back to the quad fire plugs with a platinum center electrode that would fall out.
Long story short: changed spark plugs 4000km ago as per my 2019 Hyundai Kona 1.6t manual. Followed Service manual, and the recommended torque on the side of the box of the Bosch (non OEM) replacement, 17 ftlbs.
Grounding electrode on plug #3 failed, destroying 2 valves and marking up the cylinder wall.
I just put Bosch plugs in my 13 Veloster turbo and got 300 miles and it started missing replaced with the ngks no issue since
Do not I repeat do not put Bosch plugs in any import. Don't know why but they always cause problems.
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