Engine burned all my oil in 3 months (~3k miles)

Yeah - that's why I started digging into it. When it filled TO THE TOP with about 5.5qts the first time I did a change, I thought I did something wrong. I started the engine, stopped, checked again, checked after a day of driving, checked after a week of commuting, etc. So I started looking for information, forum posts (here and other forums), and found a LOT of people questioning the same thing.

I don't know what the statistic is for percentages of 2TRFEs that show full with only 5-5.5qts, but it's quite a significant number based on posts.

The consensus I have found is that.
1. When the engineers spec'd it, they did not account for crevices/pockets that would hold oil such that it would remain in the engine.
2. There are a lot of 2TRFEs out there with dipsticks that are longer than spec'd (thereby showing full before it actually is).

 

Sounds like a good idea.

Nice pics. I'm not an experienced mechanic, just a DIY'er, maybe @Dm93 or other pros will look over this thread & your photos & put in their more-valuable comments.

In your pics I notice:

- Moderate-to-heavy fouling, particularly noticeable on the ceramic insulators, which are supposed to be whitish & pretty clean. Probably oil burning.

For comparison, here were plugs with about 60K miles on them from my 2014 4.0L V6 Tacoma, which has never burned any oil between 3.5K-5K oil changes:



If you plan to get a flex-neck illuminated camera, you can inspect the inside of the cylinders. These videos may give a useful comparison w/ your own engine. The cylinder inspections on this youtube page are the same 4.0L V6 at ~68K miles, engine operates completely normally, no oil burning or other issues.

https://www.youtube.com/@JohnDoe-cw3yl/videos

 

Looks like some oil deposits on them but I've definitely seen worse.
By the way those aren't the correct plugs for the 2.7L, those are for the 4.0L.
The 2.7L takes

$59 SK20HR11 ---- IRIDIUM PLATINUM power pack Spark Plugs -- # 3421 ----- 6 PCS NEW

SK20HR11 plugs.

 

See, when you bring in the pros you get your money's worth.. TW forums would be cooler if it had a smoothly-integrated tip jar function. I'd drop $5 for a coffee for that tidbit alone..

 

This ^. Definitely some oil burn on the intake side but like @Dm93 said they could be way worse.

 

Although Toyota specs iridium, if he went to Denso's site and drilled down for a 2006 Tacoma 2.7L, it will give back the 3381 / K20HR11 as an appropriate plug from their "resistor plug with U-Groove design"

It happens when looking up Prius plugs on Denso's site directly too (I don't remember which "regular" plug comes up) even though MANY people report problems when they try to use "standard" style plugs (usually to save money). Toyota also specs iridium for the Prius as well (because the change interval is 100,000 miles. 100,000 miles is an insane interval to me, because even if the plug is still good, there is a higher likelihood of the plug ending up seized to the head.

When I first started dating my wife I tried to change the plugs on her Xterra, which also spec'd at 100,000k interval and it had 90K. Other than it being crazy hard/slow to get them out, 3 out of the 6 plugs had the gaskets fused to the head. It was so corroded, I had to carefully use a pick to pull them - and even then they took about 1 hour of careful picking. One was so bad I thought I would have to pull the head and take it to a machine shop.

https://www.densoautoparts.com/