Haha, no worries, Grant - I know very well where we are in the world and it's not the first (or last) time I look abroad before buying something...! It amazes me though, how Porsche can charge these prices for their parts here. I could've got the non-branded, but correct, Bosch plugs here for about $27 each, which also is expensive but would have been more bearable. But when deciding to go for the extended warranty, I gave up also on that and bought from the dealer.

Regarding spark plug change interval I don't find anything specific in my service book, but since it's not part of the first 2-year service (or 20000km), I can only assume it will be done on the next, 2 years (or 20000km) from now. Meaning 4 years (or 40000km) from when it was new. Big difference to the US. But I found a document somewhere where EU and US were classified as different markets with respect to the fuel quality and that might be a reason for this difference. Although for me, when looking at my plugs, there's no question about the sense in changing every 2 years also in EU.

 

Thanks a lot mate... I m in italy and i ve just bought a set of bosch plugs for my next maintenance... I m at 21000km

 

this thread is very useful, thank you for all the comments
planning to replace myself

i'm trying to order the correct spark plug for my 991.1 2015 car. 99917015390 is the part but it appears this has been replaced by 99917015391 (last digit 1)
does anyone know if the latter (for 991.2 cars) will be OK (or better to get), as it's hard to find 99917015390

 

Thanks to USMCGT (Post 143) I found the plugs in stock using Bosch Part Number 0242145562 for $12.99 each with free shipping. Hopefully they'll be here in a couple of days.

 

from eEuroparts? never bought from them, is it a reliable source?

 

100%

Do not buy spark plugs, air or oil filters, or oil off Amazon unless you are willing to risk getting a counterfeit product.

 

Just installed the bosch spark plugs.... The car drives very bad at low rpm with light throttle... A lot of hesitations... . No prob at wot... I m a bit concerned. Next Monday i m going to reinstall the old oem ones and order a new set of porsche spark plugs, hoping to solve this situation

 

Interesting - do you get a warning light or anything? I was not convinced that there was a Bosch part number for the .2 models (seems safer to use Porsche ones for .2). Good luck!

 

No lights.... All seems perfect if you dont drive it :-)))))

 

old oem plugs back on the car... but the strange behaviour at light gas and low rpm is still present..... any ideas?

 

The only thing that I can think of is maybe an ignition coil is going bad or one of the connectors is not on securely? You had no issue before changing plugs?

 

no issues... i think the same... my mechanic is investigating now....i will let you know once solved....

 

problem solved.. it wasnt related to the new bosch plugs but to a faulty coil.... the rubber end of one coil had a little crack that caused the uneven run of the gt3 at low speed.... changed only the rubber part and now the car runs smooth and fine ...

 

Great to hear

 

I did a plug change in my .2 GT3, it was a piece of cake. Just need the right plug socket, extensions, and e-torx sockets, and it’s very easy.




this is how they came out, about 5800 miles on them, they seem OK to me.