MarkRobinson

Doing a service on my GTS 6spd before taking out of town for the holidays. After reading conflicting reports on how often it's recommended to change the plugs on the GTS, I picked up a set today to swap in, but am worried of the following:

Existing Bosch plugs have four ground straps with a very low profile. New plugs have a single ground strap with a much higher profile...worrying me that I might have impact with the pistons if I install these plugs. There's no easy way to spin the crank pulley to see if the new plug will impact.

Worse, there's nothing i could find on the web that anyone has actually installed these plugs or the they're specifically safe for the GTS since it is believed to be a higher compression version of the more tame normal v8 version; with possibly a reduced squelch area where the plug could impact the piston.

Thoughts??

k722070

probably best to ask whoever you got the autolite part number if they know if the plug is safe to use.
I got my plugs from sunset, part #999 170 122 90, comes up as bosch fgr-5-nqe.
autohausaz has them for 9 bucks.

maintenance book reads plugs every 36k miles, but no later than 4 years.
what are the conflicting reports?

MarkRobinson

For the GTS I read 18k miles...as rediculous as that sounds.

In returning the plugs last night OReily's computer showed an actual GTS reference so it's probably fine.

If I can find the Bosch or the E3 plugs in town I'll go with those today...still wanna change them today for my long trip this week.

garrett376

It's hard to argue with this publication which says 4yrs/40,000 miles:

http://files2.porsche.com/filestore....a-64cee6b3763d

from here:
http://www.porsche.com/usa/accessori...anceintervals/

hahnmgh63

I wouldn't put an Autolite plug in a Pinto, little alone a Porsche. Why would you not go with OEM plugs. You can get them reasonably.
http://www.autohausaz.com/search/pro...2@Spark%20Plug

Andy E.

I'd have to strongly agree with this statement and have my doubts as to whether or not the Autolite plug would be an exact replacement for the Bosch unit. Here's the CDN PAG recommended maintenance schedule showing plug replacement at 60K km (40K m).

endless_corners

As an aside, the oil change interval on 03-06 cayenne s is every 20k miles / 2 years...? Can that be right? That's what it says in the PDF. The image above is for v6.

hahnmgh63

Not 100% sure but I thought Porsche reduced that '03-06 oil change interval' down to 10K?

Andy E.

Spark plug replacement frequency is the same for both 2009 V6 & V8. Scanned the entire document showing all Cayenne models. Regarding oil changes, are we to believe that 2003-2006 model engines used better internal materials; hence the longer intervals?

endless_corners

Well I have been changing my cS every 10k and will continue to do so. It just creeps me out to go any longer.

hahnmgh63

Could that, and the fact that the non-turbo 'S' models don't have piston oil sprayers be a causal factor in so many 'S' models have cylinder wall issues?
To the Mark Robinson, I would just be safe and get the OEM plugs, you don't have to pay Porsche prices to get them but you do have to wait when you mail order. Will give you a safe piece of mind and guaranteed they are better than the Autolites.

mcbit

I believe that the reasoning was that the implementation of DFI in the 4.8 engines required more frequent servicing.

kosmo

i change the plugs every 40k, but i have a '11 C S