Spark plug Bosch or BERU

if you want to save a bit and still want some quality get bosch plugs those are good too, I’ve used them before and they were pretty good as well.

The bosch plugs can be found at autozone or O'Reilly's for about 18 bucks each. Cant recall the exact spec, but vw uses the Bosch plugs stock, so its a direct oe swap.

Replace the spark plug with a Bosch. See if it will start and run.

I have a shelf of new parts for a bunch of my VW’s. All the cap and rotor parts I can find are the same for either car. They’re brand new. The plugs are brand new as well. Gapped by the Bentley. The plugs were “black” from trying to fire but not.

I purchased from a local auto parts store for my 07 E550 and SO's 05 E55 - stealership quoted around $1k, parts for each with Bosch Iridium plugs was about $125. Installed new plugs at around 70k for the E550 and OE plugs (also Bosch) looked clean and the gaps were spot-on

I ran Beru RS7 plus which are one step colder when I tuned stage 1 and they didn't last at all. Might have been under 10,000 miles. Recently went with NGK plus that APR reccomends for stage 2 and so far so good. No misfires since.

Bosch spark plugs aren't bad, per se, but they're not really anything special.

I ended up checking the ignition timing again, put in a new coil, new knock sensors, put in another fresh set of plugs, set the DPR MA to +5, and I failed my emissions test with the same results.

when I worked for a Chevy dealer we hated Bosch plugs. Chevy's just don't seem to like them, they were often the culprit in misfire diagnosis.

Never use the Bosch ones for the E46s. Just not working right