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Engine & DrivetrainDiscussions about the engine and drivetrain of your vehicle.
This is a discussion thread titled "The V8 is a filthy engine!", within the Engine & Drivetrain forum, part of the Technical & Vehicle Assistance Forums category.
I've noticed that my V8 engine is a rather filthy running engine, especially for one that is LEV certified. I have 30,000 miles on my V8 SR5 Tundra now and I have noticed that the engine oil is extremely filthy every time I change it. I usually change it around 4500 miles even though the owner’s manual says I can go more.
The other day I did my 30,000 miles service, which involved changing the plugs. I noticed the spark plugs indicated that the engine was running on the rich side or at least they appeared that way. There was some carbon buildup on and around the electrode. While I had the plugs out I shined a flashlight into the spark plug hole to get a look at the piston tops. What I saw was a lot of carbon buildup I also noticed that the tailpipe has black carbon buildup on the inside.
I have always used synthetic oil except for the first 5000 miles and during my 30,000-mile service I changed the oil also. I put in by mistake 5W-50W oil thinking it was 5W-30W oil. I noticed that the oil gauge read slightly higher when the engine was warmed up and just today I noticed that one of the bottles said 5W-50W synthetic oil. I went out and purchased the correct oil and changed it with only 120 miles on the motor oil. The oil to my surprise came out looking black and filthy like it had been there for 3000+ miles.
I also disassembled the air intake and cleaned the throttle blade. I was surprised to see just how much black gunk built up on and around the throttle blade.
What’s the deal with these new Toyota engines? Are they naturally this filthy or is it just mine? I have owned many other vehicles all American and non of them to the best of my knowledge would have such filthy oil, plugs, or throttle blades. I have also rebuilt three engines, one that has 75,000 miles on it and they didn't soot up the oil like that or have carbon buildup problems.
What's the deal?
__________________
stock exhaust
Formerly Modified JBA headers now SSautochrome headers temporarily
TRD LSD
Extang lift off tonneau
Hankook DynaPro AS RH03
stock air filter & box
220 HP @ 4800 RPM
302 TQ @ 3400 RPM Run With Spintech Sportsman XL muffler, stock air filter, and JBA headers
208 HP @ 4800 RPM
285 TQ @ 3400 RPM Run With Spintech Sportsman XL muffler, TRD air filter, and stock manifolds
204 HP @ 4800 RPM
271 TQ @ 3400 RPM Bone stock
Quarter mile 15.526 @ 87.17 mph bone stock in 40-degree weather 2WD SR5 V8.
Quarter mile 15.389 @ 88.66 mph modified in 60-degree weather 2WD SR5 V8.
0-60 IN 6.88 seconds on G-tech
Dyno run results click here
i too, have black smoke out the exhaust, but only when i start it up and take off real fast, pedal to the floor., but your question on the oil, my friend told me that the mobil 1 is doing it job if it comes out black like that. now i did ask him when we changed the oil on all the race neons why it doesn't, but remember that they (the engines) have less than 150 miles after a weekend of practic and raceing, then we dump it. that oil still looks golden. hope this helps you out.
hm...i have been running mobil-1 the last few oil changes, just recently going to a 5k interval at 50k miles, and i have never experienced black residue, oily discharge, or the levels of gunk you're describing...my oem plugs were clean, albeit worn down to the nubs, when i swapped them for denzo iridiums at about 38k miles, this was on dino oil until about 35k miles. the throttle body had some hardened black gunk on it, but came off pretty quick with throttle body cleaner and a toothbrush. no gunk in the tailpipe, i check it around oil change time and now and then when im curious...
sounds like something else may be the culprit...? are you sure your air filter is seated properly?
A good oil filter will help not only to clean up the engine, but to keep it clean. But as has been previously mentioned there must be a root cause to this somewhere....
~ Fred
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"Beware he who would deny you access to information, for in his heart he dreams himself your master."
I would suggest you get an oil analysis done to determine the true state of your oil. What air filter are you using and how often is it replaced or cleaned?
__________________ ~Glenn~
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Running clean here. Oil still looks dark amber at 4K mile change intervals. 50K miles now. Didn't see the plugs at 30K mile service. Had the throttle bodies cleaned even though they weren't that bad yet. Bassani exhaust tips don't have any black at all, but are turning copper colored inside of them after 20K miles. I run mid-grade and premium gas.
I use all Toyota oil, air, and fuel filters. The only thing I can figure is that the passenger side exhaust manifold leaks when it is cold and that is fooling the computer into thinking there is a lean condition, which means it will add more fuel.
Yezzzzz...come to think of it, my gas mileage, power, and pretty much everything else was hosed until they replaced my exhaust manifolds (gawd, those things are ugly! headers...must get headers...). Dunno if I was showing residue at the time tho.
I use Mobil1 Synthetic and Toyota OEM filter. Comes out like maple syrup (translucent dark amber color) every 5K. Going to 7500 unless I offroad a lot.
Dude, have your manifolds checked! I took mine to the dealer today and low and behold, my right one is cracked! I posted in the manifold thread also.
Andy
I did and they told me there is nothing wrong and that is how they are supposed to sound. It doesn’t matter anyway because I'm going to replace those restrictive logs with some JBA headers.
Originally posted by v8Toilet I've noticed that my V8 engine is a rather filthy running engine, especially for one that is LEV certified. I have 30,000 miles on my V8 SR5 Tundra now and I have noticed that the engine oil is extremely filthy every time I change it. I usually change it around 4500 miles even though the owner’s manual says I can go more.
The other day I did my 30,000 miles service, which involved changing the plugs. I noticed the spark plugs indicated that the engine was running on the rich side or at least they appeared that way. There was some carbon buildup on and around the electrode. While I had the plugs out I shined a flashlight into the spark plug hole to get a look at the piston tops. What I saw was a lot of carbon buildup I also noticed that the tailpipe has black carbon buildup on the inside.
I have always used synthetic oil except for the first 5000 miles and during my 30,000-mile service I changed the oil also. I put in by mistake 5W-50W oil thinking it was 5W-30W oil. I noticed that the oil gauge read slightly higher when the engine was warmed up and just today I noticed that one of the bottles said 5W-50W synthetic oil. I went out and purchased the correct oil and changed it with only 120 miles on the motor oil. The oil to my surprise came out looking black and filthy like it had been there for 3000+ miles.
I also disassembled the air intake and cleaned the throttle blade. I was surprised to see just how much black gunk built up on and around the throttle blade.
What’s the deal with these new Toyota engines? Are they naturally this filthy or is it just mine? I have owned many other vehicles all American and non of them to the best of my knowledge would have such filthy oil, plugs, or throttle blades. I have also rebuilt three engines, one that has 75,000 miles on it and they didn't soot up the oil like that or have carbon buildup problems.
What's the deal?
the V8 is dirtier. i wonder if your 02 sensors are going or are bad and making engine run rich and the computer isn't reporting it.
that 120 change acted like an engine flush. i experienced the same after the dealer did my oil change and i decided to put in synthetic 700 miles later. it came out very dark and i thought the dealer didn't change it account it looked like 10000 miles old.
"I attached a picture of what the soot in the tailpipe looks like after 15,000 miles."
Ick!
How do you drive it? Lots of stop and go? In the olden days we went out in the boonies and drove 80-90MPH for half an hour or so to burn out the carbon. I thought techology had improved since then...
The Driving I do is at least 60% highway driving. When I went to the Toyota dealer Monday to get my leaking manifold looked at I ask him what his thoughts were. He said that the Teflon coating on the pistons discolors the engine oil. He has a Tundra and said his gets really black too. Maybe an oil analysis is in order here.
I think the best way to get ride of carbon deposits easily is to use some of that engine/fuel injector cleaner. I used that stuff on an engine that had severe carbon buildup before I tore it down. When I tore it down most of the carbon had flaked off of the pistons and combustion chambers. The only difference between 87 and 93 octane gas is its flash point or knock resistance. They both have the same additives. If anything 93 will build up more varnish than 87 will because it burns slower than 87. 93 doen't make more power than 87 octane unless your engine required 93, which it doesn't. If you use 93 octane in a motor that only needs 87 you will actually lose power because the fuel burns more slowly. The oil companies do a good job of fooling the public into thinking 93 is better than 87 when more than half the cars on the road today don’t require it. These people are just burning there money away.
Running your engine to high rpm in second gear and them manually shifting it into gear while it's on the highway can't be too good for your transmission!
The V8 is a filthy engine!
I also noticed that the tailpipe has black carbon buildup on the inside. 
