2008 LR2 HSE with 117784 miles.
changed the oil and filter (Mobil 1 5W30 high mileage, Mann filter from Amazon)
spark plugs: NGK 6619 Iridium Spark Plugs LFR6AIX-11 $36.99 Amazon
cleaned the Mass air flow sensor (don't yell at me but i just used a Q-tip and looks new after the cleaning) and air filter (ordered it but not arrived yet so i simply cleaned it).

Initially gave me two error codes P0365 and P0365 pd which is camshaft position sensor error. Turns out the connector was loose, it was a part of the wiring harness that connects all the spark plug and i didn't plug in all the way.

Anyway the rans great now much better than before, pulls strong and responds quickly..
For under $100, the money well spend.

 

Nice job! A couple questions, please:

Do you set the gap on the Iridium plugs? If yes, what gap did you set?

Did you torque the plugs when you replaced them? If yes, what torque setting?

 

It was pre-set and i didn't have to touch it. The gap was 0.030"

No, i didn't. I hand tightened it till it's all the way in and gave it a 1/4 turn with a ranch.
Put some spit on the thread and it goes in very easily

 

Was it difficult to remove the plugs from the deep wells? Did you need one of those thin wall sockets with a rubber insert or magnet to help pull the plug out when unscrewed?

 

No it was easy, it came out with out any problem.
Also, the sparks plugs are on top of the engine, which makes is very accessible.
I did however used a spark plug socket which has a rubber ring inside to hold the spark plug, since i have a set.

 

Have you noticed any improvement in your gas mileage after changing the plugs?

 

After this service, my 3 tank mpg average went from 19.6 mpg to 20.8 mpg.