spyder fan

My dealer tells me that I need to replace the spark plugs on my 2019 GT3 RS every two years due to the incapatebility of the aluminum heads vs the steel spark plugs.

spyder fan

What do you think?

numnut

Replace the plugs, as per Porsche's recommendations, every 2 years. It's an easy DIY.

With the DFI engines it's easy for the plugs to get carbon welded in, if left too long. Plus these engines are hard on the plugs.

tstafford

I agree - replace them. And if you aren't handy (I'm not), it's not a pricey thing to have your indy do. I think mine charged $600 much of which was the plugs themselves.

GrantG

$147 and about an hour (if you include removing and replacing rear wheels which helps on jack stands) to put these in:

Spark Plug Set : Suncoast Porsche Parts & Accessories (suncoastparts.com)

rob944s2

It's legit. While 2 years seems like a very short interval and the plugs themselves may be in good condition, the 2 year replacement interval is recommended due to the dissimilar metals.

Chris88

How about just removing them and reinstalling them with a bit of grease on them? In 2 years, I only put about 5,000 miles on my car.

GrantG

The shop manual explicitly says not to use anything on the plugs (just dry).

$147 every 2 years is not that big a deal (that's like a tank of fuel)...

Chris88

Good point. I just hate throwing something away prematurely. Is the mettle of the plugs somehow changed after being in the heads after 2 years? What would be wrong with just removing and reinstalling?

GrantG

I never considered reusing the plugs, but I suppose you could do it. Probably best to rotate the plugs into different cylinders and mind the special torque spec for reinserting plugs (different from new ones)

mipcar

Got an all change coming up and will be under there anyhow. Thanks for the reminder; parts ordered for the 16

krell

If one was to reinstall old plugs I would also recommending "rotating" them to a different cylinder than they came out of. I noticed different scoring on mine between those forward and aft. OR, if you're going to be under the car, just put new plugs in.

RockyTopTenn

I wouldn't do this in a Porsche. The washers on plugs are designed to crush at the proper torque. They don't act the same way on a re-torque.

On a lawnmower or jetski, I wouldn't worry. On a $200K GT3, may the force be with you...

redlightrich

I am with Rocky.. The plugs metal have already been thru hundreds of heat cycles along with being dissimilar metals.. The labor to change them is more valuable than the plugs. Peace of mind. If you already went thru the trouble to get the plug out, put a new one in its place and be done for another 2 years or so. I have seen plugs seize and take out aluminum threads with them. If that were to happen, it becomes a bad day fast.

Please take the advice of people who are pointing you in the right direction.

Good luck

Rich

GrantG

Yes, that's why there is a special torque spec for re-inserting used plugs (I personally just use new ones every year, even though not absolutely necessary):