Recently replaced original spark plug wire set w/new Bosch; wire set, distributor cap, rotor, O2 sensor and Platinum spark plugs
Vehicle:
Volkswagen Scirocco
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So, I went ahead with the Autolite XP iridium plugs. Right now, I cannot complain. Everything is running pretty good. I put these in to compare to the standard Autolite copper plugs that I put in my 2001 2.0L AEG in January of 2009. Here is what has happened so far. 1. Since the new plugs, my idle rpm increased about 50-100 rpm to low 800s to mid 800s . Whether this is good or bad, I don't know. This may consume a small bit more of gas though while sitting at a stop light. 2. Since the new plugs, I can also feel a small vibration that seems to come from the engine bay. This only happens on a cold start as I am accelerating from around 15-40 mph. When it's warmed up, it's gone while accelerating. This may come my new catalytic converter and flex pipe that I just got installed, but I don't know. It may also come from new front rotors and pads that I just put in that haven't had time to properly be bedded, I don't know. I am putting some new dog bone mount inserts in within the next few days as well. 3. Since the new plugs, my engine seems to have had a small performance increase in acceleration, response, and in smoothness; except in cold start accelerations as stated above. This may not make a big deal to some, but I am happy with this. 4. Since the new plugs, the best deal I have had is the lower rpms when I am using cruise control around 40-55 mph. I am serious when I tell you that my rpms went down a good 150-250 rpms at these cruising speeds. I do believe that because of these plugs, I will get a small boost in mpg; I will let you all know shortly. Also note that only the plugs and nothing else was changed at this interval. Can I tell you what happens at 65 mph+, no because I don't go on a highway to school or work. So, my overall impression with the iridium plugs is a positive one so far. I have gone just over 500 miles since the new plugs were put in.
Pros: improved acceleration, smoother engine, lower cruising RPMs, potential MPG boost
Cons: increased idle RPM, cold start vibration
Vehicle:
Volkswagen Jetta
Mileage: 805 km
So I went with the ever popular BKR7E plugs gapped at .028\". I bought a spark plug gapper and verified the gap which is a good thing because the BKR7E's come pre-gapped at .033\".
Pros: verified gap, good thing
Cons: pre-gapped at .033
I think that the recommended plug (and original equipment) is probably a Bosch Silver plug, and that is what I would probably stick to if I were you.
Pros: OE plug recommended
i like the way it runs str8 out of the box b/c ngk says not to gap them
Pros: runs well out of box
the car seems to run really good at the .028 with the bosch plugs
Pros: runs really good
Vehicle:
Volkswagen Passat
My old GLX didn't like anything but NGK coppers.
Pros: preferred performance
Cons: disliked other types
Vehicle:
Volkswagen
Stock on mine was .032, but my buddy's GLI was gapped from the factory at .029. I gapped my NGK iridiums at .028. I broke two plugs in the process...gapping iridiums with a normal gapping tool doesn't work!!
Cons: broke two plugs
I went with some NGK coppers. I dont know the exact part numbers of them but the ones I got were crap lol My MPG went down to 19 mpg.
Cons: poor MPG, low quality
After too many bad experiences/unhappy motors I wouldn't put bosch plugs in a lawn mower.
Cons: bad experiences, unhappy motors
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