Bosch F5DP0R Plug change for 1992 UrS4

[92UrS4]

I picked up a new set of plugs from Randy and Todd over at Autobahn last week and replaced them this weekend. What a difference. I'm not sure when they were last changed but I have put about 20K miles on the car since I bought it and as I understand these puppies need changing about every 30K. I noticed a pretty big drop in mileage lately and the car just seemed to be lagging.

The plugs are very pricey, places like Checker want about $25 for each plug, the dealer wants more. Randy and Todd were very fair and their prices were competitive. Plus knowing I could get them locally and having a place to go back to with any issues was nice.

All in all it is a really quick job on the Audi AAN 5 Cylinder engine. While I would prefer to spend less on plugs, I guess my baby is worth it after putting 150 miles on this week. Car is nice and peppy again and the mileage is creeping back up.

[DenverPat]

After using those plugs the last 100K or so, I can say they're worth every penny in the proper application.  Lub 'em.

[Eric18T]

I am also running the same plugs in my 1.8T. Great plugs and seem to last quite a while.

[redline]

wow, they sound good, but $15 a pop

are there any good cheaper alternatives?

[92UrS4]

Not anything that will perform as well. At list with this engine, until it reaches a certain state of moddedness (read hp) this is the absolute best.

I recall having run these in my B5 1.8T back int eh day, but I didn't remember them being so expensive. This was also 4 years ago the last time I bought some for one of my cars.

[DenverPat]

First, let me say I understand $15 is a lot for a spark plug.  Along the same line, $200 is a lot of money for brake pads.
Now that I've got that out there, $15 is SUPER cheap to ensure your car runs well.  And $200 is cheap to ensure your car stops well.
People commonly drop $2,500 or whatever on a BBK, $3,000 on a big turbo setup....whatever.  Putting $100 pads in a BBK will yield inferior braking performance than good pads in the OEM brakes.  Considering the performance you get per dollar for good plugs, brake pads, etc., these are UBER-CHEAP.
So I guess what I'm saying is, in a tuned car that specs $15 plugs to get the best performance from the other mods is a no-brainer.  Saving $20 per set of plugs would be a completely idiotic move, as it would likely negate the other power mods performed.

[redline]

I understand that, but $120 for plugs? Especially when I have no mods...

[Eric18T]

In the grand sceme of thing $100 for a set of spark plugs that keep the engine running properly is trivial.

I just ordered 2 new sets of $200+ brake pads for our next HPDE's at NHIS & Watkins Glen this spring. I want to make sure my car stops well just as much as i want to make sure it runs well.

$15-20 is cheap insurance to make sure the engine keeps running with proper spark/igntition.

[DenverPat]

I understand that, but $120 for plugs? Especially when I have no mods...

You wouldn't buy those plugs if your car had zero mods.

[92UrS4]

Just to be clear with everyone, while discussing this particular plug, Bosch F5DP0R, it is OEM spec stock for the AAN 2.2l 5 cyl turbo. I don't know about the 2.8l V6.

As I mentioned with this motor if it is HIGHLY modified this plug will not be good at a certain point. As long as you are stock, or even up to RS2 spec it is probably the best plug to be using.

Make sure you are always using the right plug for your application, sometimes spending more is what it takes to have a properly running motor.