Reiver

I only have 16,500 on the clock and have done all of the maint. myself....over the required to have a solid baseline...air filter/ oil at 5 k regularly/ brake fluid change etc....
I see they recommend an also 'by date' spark plug change regardless of miles.
I am assuming this is due to the concern about spark plugs locking themselves in place over a long period of time causing a potential real issue.
If so, with the miles I have, I was thinking about simply breaking the plugs free and re seating them.

Make sense or not?

gatorfast

If you are going through the trouble of doing that then I would just replace them. The plugs themselves are not expensive, its the labor to change them that can be difficult. If you are in there loosening them up you may as well just take them out and put new ones in.

worf928

This -^. Getting to the plugs with a wrench is 99% of the battle and why the plug change service isn’t cheap.

Also, plugs have a crush ring for sealing. They never seal as well as they do the first time.

As long as you’re not paying ~$30 per plug for the Porsche box, there is zero reason to use a plug twice.

Reiver

Good pt. about the crush rings

raaizin

I replaced the plugs on my 991.1 at almost 7 years and around 22k miles. They came out without issue.

GregWormald

I understand that turbo engines are harder on plugs than naturally aspirated.
I had mine replaced at 40,000 Km (25,000 mi.) and the increase in performance was readily noticeable. So I'd say if you are going in there anyway, just replace them.

Reiver

Yes, I get that but at 16k they are still fine by Porsche....it is the 4 year gig I am wondering about and the only thing I can think of is avoiding seized plugs. This would also depend upon the weather/location I suspect but they do not consider that when worldwide sales are in order.

Bob Z.

You are correct - that is the reason.