[Real Lyte]

I took the windshield washer reservoir and pump out to make the driver's side much easier (still not easy though). Took me one hour first time.

Would you recommend getting your oil tested every time yo do your plugs by blackstone? haha...

 

[Real Lyte]

Nice write-up. Doesn't sound too hard, just time consuming!
I'd also recommend wearing mechanic's gloves for the super tight spots.. so you don't skin your knuckles.

I think skinning your knuckles is inevitable :Banane35:

 

[Real Lyte]

Just to report back. The Autolite Plats ($1.99) gave me the best mileage I have had thus far on the car. (32.4 mpg) now that was over only 250 miles but the other part of the trip included 40 miles of driving inside the Pittsburgh area and my overall trip mileage (474 miles) averaged 31.2 mpg). I intend to pull the plugs at 20K miles just to examine them. But this is the 4th vehicle I have had them in.

Changing them the second time will be a piece of cake...1.5 hours.

Autolite#..AP3924

So does your foz doesn't run rough with the autolite plats? All the ppl at work (autozone) say I shouldn't put anything in with a different heat range. The foz is spec to 6 (NGK only basically), those are 3...

 

[Real Lyte]

Yeah, simply I would be concerned in general dropping from heat range of 6 to 3, anyone have a definitive answer?:crazy:

 

[Real Lyte]

I really was not aware of that. Not doubting you on this but where is that information?
If this is true, I'll have to pull them.

Additional Information: I called up Autolite Technical Service. They indicated that the NGK-FR-5AP-11 is a Heat Range "5". The Autolite AP-3924 is a Heat Range "4". The Last # is the Heat range. The next plug that Autolite makes is a AP 3926 which is a "6" heat range.

So based on that I will keep them in 10K and check them then.

I will have to search for a concrete source to this accusation by the guys at work...but they all say that your car will run like crap and sometimes causes other problems because of unburnt fuel etc.

 

[Real Lyte]

I will be doing my daughter's 08 this weekend. Might go to Subaru with Subaru Bucks and get plugs from them.

Sorry I haven't researched it much more because life has been busy, if I get some time tomorrow I'll pick my father in law's brain (manager at autozone and vintage car lover). :biggrin:

 

[Real Lyte]

Dubaya, keep in mind many ppl at parts stores don't know this but...when it comes up in the computer as saying it "fits", this purely means it will fit but not necessarily be the right heat range. I was looking through the plugs recommended for my foz autozone, the NGK coopers were the only correct heat range out a list of maybe 15 plugs it says will fit.

 

[Real Lyte]

Autolite heat range #3 = 6 NGK, and Autolite #4= a 5 in NGK. Colder #'s are good for those who WHOMP on their cars and may have a pinging problem, hotter for best gas milage at light throttle cruise. Or COLD 6 or 7 for teenagers and hot 5 for Grandma.

Lol. I like how this thread has evolved, good info though. IMHO, I'm sticking with the manufacturer recommended NGK heat range 6 copper plugs. It isn't that bad doing them every 12k (maybe an hour's work).

 

[Real Lyte]

NGK Tech Bulletin on using anti-seize compound.

HTH,
Jim / crewzer

Huh, well I have been antiseizing all my NGK plugs for years...ruh roh. I always drop the torque though.