I found out they only replaced 4 at the 35k mile service covered by Audi. Great...

I do see why, but still it is annoying to think I drove for 40k miles more with two different types of plugs since the OE Beru plugs were superseded long ago with the RS7 NGK plugs.
It is almost like the tech at the 35k mile service said..."the driver's said is a bit$h to replace" and just skipped it.
I concur, it is a huge pain to replace the driver's side spark plugs and I honestly will not do it again, but alas at least it is done now and I have all new matching plugs. LoL
I also found one of the 35k replacements on the passenger's side was loose....again, thanks Audi "master tech".
Amazingly all the plugs looked very good. No fouling, wetness or issues of any note at all.
So far I can tell the slight hitch I used to feel slowing to a yield and then accelerating feels better. Also off-idle acceleration feels more immediate than I had gotten used to for years.
I have not had enough time to see if gas mileage is any better, plus I have a different driving pattern now anyway.
What I think is interesting is the car throws no codes for mismatched plugs/ slight possible timing difference or a loose plug. It just kept on trucking. Pretty resilient.
I also found one of the hoses to the secondary air system was disconnected/loose from prior repairs. But I had the dealer fix that when they replaced the thermostat in my other thread.
So that's it for now...
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