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All information here was gathered from the owners manual, parts websites, and members on the forums. Use at your own discretion.

Oil
5.7 Quarts (0W20)
Drain Plug Crush Washer (14mm) Part # 94109-14000
Drain Plug 14mm (29 lbf ft)
Oil Filter (9 lbf ft)
—(Filtech) Part# 15400-PLM-A01 <- better quality than A02
—(Honeywell) Part# 15400-PLM-A02
—(Mahle Tennex) Part# 15400-RTA-003 <- replacing A02 at some dealerships

Note: Use an 17mm socket for the drain plug, an oil filter wrench on the filter, and a ziplock bag over the filter to keep things clean.

To reset the service minder, toggle to the oil life % screen, hold the reset button for 10 sec, select reset on the screen and push the reset button.

Transfer Case
0.45 Quarts (Honda HGO-1 Hypoid Gear Oil GL-5 75W-85) Part # 08200-9014
Drain/Fill Plug Crush Washer (20mm) Part # 94109-20000
Drain/Fill Plug 20mm (32 lbf ft)

Transmission
3.3 Quarts (Honda ATF DW-1) Part # 08200-9008
Drain Plug Crush Washer (18mm) Part # 90471-PX4-000
Drain Plug 18mm (36 lbf ft)
Fill Plug Crush Washer (24mm) Part # 11107-PWA-300
Fill Plug (32 lbf ft)

Video for transmission fluid and filter change below:


Rear Differential
1.92 Quarts (Honda Dual Pump Fluid II) Part # 08200-9007
Drain Plug Crush Washer (18mm) Part # 90471-PX4-000
Drain Plug 18mm (35 lbf ft)
Fill Plug Crush Washer (20mm) Part # 94109-20000
Fill Plug 20mm (35 lbf ft)

Note: Both the drain and fill plugs only require a 3/8th's ratchet-end (no socket needed). If plugs are tight (they always are for first time removal) put a 1/2 inch to 3/8 inch adapter on 1/2 inch drive short breaker bar or beefy 1/2 inch ratchet to loosen. You may need just a bit more than 2 full qts to get it to flow out of the fill opening, ~2.1 quarts.

Air Filter
Part # 17220-5J6-A10

Cabin Filter
Part # 80292-TZ5-A41

Wheel Lug Nuts
22mm (M14). PartNo: 90304-TK4-A01 (94 lbf ft)

Spark Plug
5/8 in (16 lbf ft) NGK DILZKR7B11G Part # 12290-R9P-A01
Coil Pack Bolt 10mm (9lbf ft) 6x25 thread

Engine Coolant
Honda Anti-Freeze/Coolant - Type 2 Part # 0L999-9011

Windshield Wipers
Wiper Inserts Part # 76622-SMA-004 and 76622-TG7-A01
Wiper Blades Part # 76620-TG7-A01 and 76630-TG7-A01
For non-OEM blades go with 24" and 26" blades.

Belts
Serpentine Belt Part # 31110-RLV-A02
Timing Belt Part # 14400-R9P-A01

Misc
Rodent Tape Part #4019-2317
Oil Drain Deflector Part # VSB02C000034
Oil Filter Wrench Part # 7AAA-PLCA100
Shin-Etsu Grease Part # 08798-9013 (Lubricate Rubber Door/Window Seals)

Link to instructions for differential, transfer case, and transmission change Thanks to @LadharK
http://www.ridgelineownersclub.com/forums/attachments/second-generation-ridgeline-2g-2017/322097d1501371997-atf-front-div-rear-div-brake-service-instructions-honda-ridgeline-maintenance-instructions-07292017.pdf

Here's a link to the 2016 Pilot Service Manual (until we can get the Ridgeline Service Manual), a few procedures carry over from one to the other:
2016 Honda Pilot Service Info - Google Drive
Thanks @Themagician and Piloteers


Please comment on anything I missed (should add) or got incorrect.
 

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Great idea Alex, would be nice if the mods could make this a sticky and keep the first post updated with all the latest info so you didn't have to scroll through dozens of posts looking for the one thing you're working on. I have two things to add. First, here's the link to the rear diff fluid (I know links can go dead so if you don't want to use it, at least update to actual name and part # instead of just saying AWD fluid). And please don't think I'm being critical, you're pretty smart to think of this.

08200-9007 | Honda Dual Pump Fluid II (most models) - Bernardi Parts

Second, the spark plug # is NGK DILZKR7B11G

I couldn't find torque specs but the Gen1 guys have posted that part of the service manual and it says 13 ft/lbs. The bolt holding on the coil pack is 9 ft./lbs. Since both plugs are the same size (5/8"), I have no reason to doubt those specs but someone can chime in that has access to the online manual.

Per billmanmotion, some plugs have been found to be loose from the factory (all of mine were tight) but be ready to stretch to get to the back ones (and the coil pack wires unclip from the coil pack; again, guys have posted the diagram in the Gen1 section).
 

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Discussion Starter #9
Per billmanmotion, some plugs have been found to be loose from the factory (all of mine were tight) but be ready to stretch to get to the back ones (and the coil pack wires unclip from the coil pack; again, guys have posted the diagram in the Gen1 section).
Jeez this is a new one for me, time to check the plugs.
 

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Jeez this is a new one for me, time to check the plugs.
Couple of tips if you do. Either spray silicone lube or WD40 on the rubber inside the 5/8 socket so it will release (or be very careful and use a socket without the rubber insert). The reason for this is that most holes are obstructed so you will have to put the socket down the hole followed by two 3" extensions (6" won't fit). When you go to pull everything out, the socket stays in the hole stuck on the plug (I ended up having to remove the first plug I did and then reinstalling it because I didn't know the lube tip then. After that I used a socket without the insert).

Edit: went back and reread billmanmotion's post on the spark plugs being loose. He said some of the early S2000's came with loose plugs which ended up destroying engines, not the G2. However, while researching spark plugs on this forum, more than one G1 owner reported finding loose plugs including one post from a moderator that estimated approximately 20 ROC members reported destroying their engines when a loose plug blew out.

Based on all that (and knowing I've found several phantom washers and screws while doing various upgrades and taking things apart), I wanted to know for certain that the plugs were torqued down properly. Now I know :)
 

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All information here was gathered from the owners manual, parts websites, and members on the forums. Use at your own discretion.

Oil
5.7 Quarts (0W20)
Drain Plug Crush Washer (14mm) Part # 94109-14000
Drain Plug 14mm (29 lbf ft)
Oil Filter Part # 15400-PLM-A02

Transfer Case
0.45 Quarts (Honda HGO-1 Hypoid Gear Oil GL-5 75W-85) Part # 08200-9014
Drain/Fill Plug Crush Washer (20mm) Part # 94109-20000
Drain/Fill Plug 20mm (?? lbf ft)

Transmission
3.3 Quarts (Honda ATF DW-1) Part # 08200-9008
Drain Plug Crush Washer (18mm) Part # 90471-PX4-000
Drain Plug 18mm (?? lbf ft)
Fill Plug Crush Washer (24mm) Part # 11107-PWA-300
Fill Plug (?? lbf ft)

Rear Differential
1.92 Quarts (Honda Dual Pump Fluid II) Part # 08200-9007
Drain Plug Crush Washer (18mm) Part # 90471-PX4-000
Drain Plug 18mm (32 lbf ft)
Fill Plug Crush Washer (20mm) Part # 94109-20000
Fill Plug 20mm (?? lbf ft)

Air Filter
Part # 17220-5J6-A10

Cabin Filter
Part # 80292-TZ5-A41

Wheel Nuts
14mm (M14). PartNo: 90304-TK4-A01 (94 lbf ft)

Spark Plug
16mm (13 lbf ft) NGK DILZKR7B11G Part # 12290-R9P-A01
Coil Pack Bolt Flange 6x25 (9lbf ft)

Please comment on anything I missed (should add) or got incorrect.
Very comprehensive, thanks.

Some small additions/suggestions

Honda Coolant

Wiper Inserts

Serpentine belt

An extra funnel or two they are like 2 bucks. Sandy brings back bad memories but probably a good idea to have some more on hand.

Honda Rodent tape, hey you never know.

There is the A01 oil filter which does not have cardboard ends. It is the same price so why not especially with today's long interval oil changes. I've been getting them from H and A in California for over a decade. Haven't been able to find anyone else closer or cheaper. For everything else, I usually use Bernardi because they are the closest and price match.
 

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All information here was gathered from the owners manual, parts websites, and members on the forums. Use at your own discretion.

Oil
5.7 Quarts (0W20)
Drain Plug Crush Washer (14mm) Part # 94109-14000
Drain Plug 14mm (29 lbf ft)
Oil Filter Part # 15400-PLM-A02

Transfer Case
0.45 Quarts (Honda HGO-1 Hypoid Gear Oil GL-5 75W-85) Part # 08200-9014
Drain/Fill Plug Crush Washer (20mm) Part # 94109-20000
Drain/Fill Plug 20mm (?? lbf ft)

Transmission
3.3 Quarts (Honda ATF DW-1) Part # 08200-9008
Drain Plug Crush Washer (18mm) Part # 90471-PX4-000
Drain Plug 18mm (?? lbf ft)
Fill Plug Crush Washer (24mm) Part # 11107-PWA-300
Fill Plug (?? lbf ft)

Rear Differential
1.92 Quarts (Honda Dual Pump Fluid II) Part # 08200-9007
Drain Plug Crush Washer (18mm) Part # 90471-PX4-000
Drain Plug 18mm (32 lbf ft)
Fill Plug Crush Washer (20mm) Part # 94109-20000
Fill Plug 20mm (?? lbf ft)

Air Filter
Part # 17220-5J6-A10

Cabin Filter
Part # 80292-TZ5-A41

Wheel Nuts
14mm (M14). PartNo: 90304-TK4-A01 (94 lbf ft)

Spark Plug
16mm (13 lbf ft) NGK DILZKR7B11G Part # 12290-R9P-A01
Coil Pack Bolt Flange 6x25 (9lbf ft)

Please comment on anything I missed (should add) or got incorrect.

Here are torque specs I pulled from online.

Transmission
Drain 36 ft/lb
Fill 32 ft/lb

Transfer Case
Drain 32 ft/lb
Fill 32 ft/lb

Rear Differential
Drain 35 ft/lb
Fill 35 ft/lb

Engine
Oil Drain 30 ft/lb
Oil Filter 9 ft/lb

Use as you see fit and try to corroborate.
Thanks to the mods
 

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The wheel bolt is 14mm.
Lets clarify the lug nuts: You need a 22mm socket to torque them to 94 ft-lbs. The lugs nuts fit onto five 14mm studs on the wheel disk.
 

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Sorry to be confusing on the spark plug size. I was referring to the size socket needed to remove it. Technically, I don't think they make a 16mm socket with the rubber insert, only a 5/8" socket (I edited my post). Please change 16mm to read 5/8" Socket. And drop flange, just say coil pack bolt. Thanks.
 

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I hate to start this (there are other threads on it) but best NOT to use Oil Filter Part # 15400-PLM-A02 (made by Honeywell) and best to use Oil Filter Part # 15400-PLM-A01 (made by Filtech). There is a quite a quality difference between the filters that has been documented to death...Both are the same size and look nearly identical.

You'll even see Honda part sites saying, we'll ship you the A01 vs less desirable A02 filter...Essentially the A01 has metal end caps (whereas the A02 has paper), a better drain back valve, etc. In general, the construction of the A01 is simply beefier...
 

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Discussion Starter #18 (Edited)
Sorry to be confusing on the spark plug size. I was referring to the size socket needed to remove it. Technically, I don't think they make a 16mm socket with the rubber insert, only a 5/8" socket (I edited my post). Please change 16mm to read 5/8" Socket. And drop flange, just say coil pack bolt. Thanks.
Thanks, I looked up the part and they called it a flange so I added it, but if it's less confusing I'll remove it.

For the coil pack I have the thread number, do you know the socket size?
 

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Thanks, I looked up the part and they called it a flange so I added it, but if it's less confusing I'll remove it.

For the coil pack I have the thread number, do you know the socket size?
You're really being thorough 😀 Coil pack bolt uses a 10mm socket.
 
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