Ferrari Mailing List: Re: 100,000 mile spark plugs....

[Hans E. Hansen (FList]

Factory recommended change interval is 100K.  I've never seen
one that really needed it earlier.  But I've known people who changed
them early and installed lessor quality plugs.  Then they get stuck
with more frequent change intervals.

BTW, watch out if your late model car has plugs that are "way down
there" - recessed into the head.  This is common with OHC designs.
Late model Ford PUs with gas V8s are notorious for having the
plugs seize in the heads from corrosion because the wells that
they sit in fill with water from splashing due to off road excursions.
Many guys around here have had to have the heads removed and
heli-coiled.

Hans.

On 3/12/08, LarryT <l02turner [at] comcast.net> wrote:
> Cool!   Those appear to be Platinum tipped plugs and I don't believe the
> tips wear like the old plugs but I would have thought there'd be *some* kind
> of wear visible.
>
> Out of curiosity, what does GM say about the interval for replacing plugs?
> BTW, my 78 Malibu had a very good engine - much better than the tranny  -
> with electronic ignition, etc and after 20k miles I decided a tuneup was in
> order - plugs, distr cap, etc.  At it turned out, nothing was worn & he
> dealer said they usually go 80k-100k before a tuneup!  Back in 80 something.
> But I'd spent good money for new parts and by gosh they were going to  be
> changed!  ;-)
>
> Take care -