Went with Bosh double platinum plugs at 60,000km when I notice a stumble at idle and that's the interval for change. I instantly went from best of 9.6L/100km to 7.8L/100km big difference in performance and smoothness and i prefer a German plug in a German car with Bosch electronics.
I'd stick with the WR6DPO Bosch. Not sure why but they just work with no questions.
I just changed the spark plugs for the first time in like 175, 000 miles
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.
Bosch spark plugs aren't bad, per se, but they're not really anything special.
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.
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
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