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I'm the original owner of my 2017 Outback 3.6R Limited. Mileage is at almost 56K. Reading suggested maintenance says to replace the spark plugs at 60K miles. Two questions to follow.
1st. What is the least invasive and proven process to replace the spark plugs?
The plugs are about 2 inches from the frame so how do I get a socket to them?

2nd. What spark plug would you suggest?
I was going to go with NGK Iridiums. Sound good?
Be gentle as this is my first post here.
 

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2016 Outback 2.5
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603 Posts
What Rub said. I replaced mine at 60K and next time will wait until at least 75K.

Not sure how much difference, if any, there is between a 2017 and mine (2016). I'm guessing they are about the same.

I ordered a thin, quarter inch ratchet and several small extensions to manipulate the tight quarters. Even then it was a very tedious process. I also bought two spark plug sockets, one that grabs the spark plug to remove and another that does not to install. Particularly on the driver side you will have to insert the socket/extensions first before attaching the ratchet to remove/install. It took me longer to remove the battery tray to provide access to the drivers side than removing/installing the plugs.

Good luck!
 

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2010 Outback 3.6R
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83 Posts
I changed the plugs on my 2010, 3.6 at 100K miles. They weren't much different than the new plugs I put in. I left the battery in place. You need patience to step back and asses the situation as you go along. The plug closest to the fire wall on the drivers side is much easier to do from under the car.
 

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2016 Outback 2.5
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I changed the plugs on my 2010, 3.6 at 100K miles. They weren't much different than the new plugs I put in. I left the battery in place. You need patience to step back and asses the situation as you go along. The plug closest to the fire wall on the drivers side is much easier to do from under the car.
I didn't have to remove the battery to do my 2014 but did on the 2016.
 

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2010 Outback 3.6R 2014 Legacy 2.5i 2003 Legacy L special edition (retired to backup)
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1,669 Posts
after you
disconnect the battery and remove it
disconnect the intake tract and lay it off to the driver side if you do not want to disconnect the hoses
disconnect ps (4th gen cars) tank and lay it on the strut tower
the pugs are fairly easy to get out

un-clip all coil packs using a 90 degree pick
remove metal guard protecting wire harness for coils on each side
remove coil packs, replace any that are de-laminated
i did the rear plug first on each side as those take the most time

when removing them
insert socket into plug hole
insert 3" ext into socket and then turn until it slides onto plug
insert u-jointl into 3"ext
insert 9" ext into u-joint
insert ratchet into 9" ext
break plug loose with ratchet
remove ratchet and use hand to turn plug out (or you can 2 hand it with the ratchet)
remove 9" ext from u-joint
remove u-joint with socket and plug attached

repeat 5x more once for each plug

when reinstalling them
insert plug into socket
insert socket into plug hole
insert 3" ext into socket
while gently pressing on ext rotate ext counter clockwise until you feel the plug drop into the thread and then rotate plug clockwis plug a few turns to get it started
insert swivel and 9" ext
hand tighten plug
torque to spec

repeat 5x

reinstall coil packs
reinstall each coil pack connector making sure it clicks into place
reinstall metal harness guard
reinstall intake
reinstall battery

turn car on wait 15 second and it will start right up
 

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'17 OB 3.6 , '11 OB 2.5 , '11 Legacy 2.5
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The two Plugs I have heard the most recommended are the NGK and Denso, there are others but I have not heard any reviews or opinions on them.
 

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05 GT wagon, 09 Spec B, 18 3.6R Outback
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679 Posts
NGK, or don't bother wasting your time.

Get NGK spark plugs.
 
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