Oil Consumption & RotellaT Syn

landtoy80 · Mar 14, 2005

I have a 94 Toyota LandCrusier. It has a inline 6 motor, 1FZ with 250,000 mi.
I am using RotellaT 5w40 syn oil.
When I first started to use it, I have several slow oil leaks. Over time the leaks stopped.

My oil consumption is my queation:
I don't have to add the first qt of oil untill I get about 2800 miles. After that I have to add a qt after about 1500 mi and again after about 1000 mi.
I try and change the oil at about 8000 mi and I use OEM Toyota filters.

Why does the the oil consumption go up as the oil gets old? It seams like as the oil get darker, the more oil its uses.
Is this normal or do I need to change something?

KW · Mar 14, 2005

The oil maybe thinning due to fuel dilution as you progress through the OCI.

Tim · Mar 14, 2005

An analysis at 3000 and 6000+ would be interesting to compare, viscosity, flash point and fuel dilution.

Fuel dilution would affect the flash point, but it would be the fuel that would flash first, not the oil itself.

Wide range (ie 5W-40) group III oils use more VII than narrow range group III or wide range group IV/V. I wonder if you consumption is related to VII breakdown?

Tim

Steve S · Mar 14, 2005

The Rotella has no problem in itself as the hdeo's are made for extended drains. I wouldn't worry ,for fun have oil analized . During warmer weather try a 15w/40 to see what happens.

HardbodyLoyalist · Mar 14, 2005

Tim and Steve S are both right. It's unlikely that fuel dilution would cause the increased consumption. I would venture that the oil is, in fact, shearing. Is this engine known to be hard on oil?

Switching to 15W40 in the summer indeed might provide a useful comparison.

landtoy80 · Mar 14, 2005

How do I do an analysis at 3000 without drianing all the oil?
Just open the drain, fill the teat cup and install the drain plug???

AndyH · Mar 14, 2005

quote:

Originally posted by landtoy80:
How do I do an analysis at 3000 without drianing all the oil?
Just open the drain, fill the teat cup and install the drain plug???

Blackstone Labs sells a nice hand-operated vacuum oil sampling pump for $25 that looks like it would makes oil sampling very easy. It draws the oil out through the dipstick tube.

TooSlick · Mar 14, 2005

Use some AutoRX to clean out the pre-existing deposits and improve your ring seal. The oil consumption will drop dramatically ....

TS

k1xv · Mar 14, 2005

quote:

Originally posted by landtoy80:
How do I do an analysis at 3000 without drianing all the oil?
Just open the drain, fill the teat cup and install the drain plug???

===========
One of the advantages of replacing your drain plug with a Fumoto valve is that you can grab small samples easily without draining all the oil. This is particularly true if you get a valve with a nipple on the end.

1sttruck · Mar 14, 2005

I keep a few large disposable syringes and clear tubing that fits on hand, for drawing down fluids. The syringes are around $2 each at a local feed store. I can wash and reuse them sometimes, but some fluids swell the cap on the plunger. A few old ground glass syringes would be nice to have.

landtoy80 · Mar 15, 2005

quote:

Originally posted by TooSlick:
Use some AutoRX to clean out the pre-existing deposits and improve your ring seal. The oil consumption will drop dramatically ....

TS

I first tried M1 0w40 and I had major oil consumption but only at high rpms. If I drove it without reviing the motor to red line, there was normal oil loss. Red line, and I could loose a qt per tank of gas, 250mi.

The RotellaT syn doesn't burn the oil at high rpms.

Do you think a motor with 250,000 mi will be helped with AutoRX?
Here http://theoildrop.server101.com/ubb/ultimatebb.php?ubb=get_topic;f=5;t=003018
is the link to a pic of the motor.
NOT THE TOP ONE, thats the 3FE, it has its own problems

Look at the second pic.

chuck wood · Mar 18, 2005

Have you tried the M1 Truck & SUV or Delvac 1 5W-40? I just put some of the new bottle style (January production date) T&SUV in my inline 6 mercedes benz M103 engine and took it on a 1400 mile trip, much of which was 4k+ rpm highway cruising - not a drop missing after 1800 miles total. From what I have read, that kind of driving usually eats up oil in these engines. That engine just passed 151k miles...

Andrewsreef · Mar 18, 2005

I have a 1997 Lexus LX450 Land Cruiser and it consumes oil more around town then on the road. On a recent 1,400 mile trip with much of the trip at 80 MPH, I consumed no noticabale oil. Over the next 600 miles of heavy stop and go driving, I consumed a quart and will consume a quart every 1000 miles or so. I am using Mobil 1 truck and SUV and was considering changeing to Rotella 5W-40 to see if the consumption improves. My truck only has 85k on it and does not smoke (that I can tell).

Andrew

Andrewsreef · Mar 18, 2005

If we assume the consumption problem is from "oil shearing", what would be a better choice for our application Rotella T Synthetic 5W-40 or Chevron Delo 15w40? For me, the OCI would be around 5k. I do not like adding oil between OCIs so I would like to get the consumption down a bit. As I stated above, my truck will consume oil similar to Landtoy80 later in the OCI. I proably average overall 1 quart every 1,500 miles or so with the Mobil truck and SUV. This is about the same results I was getting with Castrol GTX 10w30 before I made the switch to T&S.

I had a recent headgasket replacement and the inside of the motor looks clean (espacially now). When I changed my first run of T&S at about 4k or so, the oil was looked pretty clean not like you would expect (dark black) .

99 · Mar 19, 2005

Landtoy80-You have 250K on it and you're concerned about a little oil consumption? Engine parts wear and get old and oil consumption happens. It's perfectly normal-at that mileage your consumption is spectacular. At such a high mileage, either a rebuild (specifically new rings, valve seals/guides) or going to a thicker oil are your only options. Maybe you have leaky fuel injectors that are fueling/thinning the oil making it easier to get past worn rings or seals?

FWIW, I use the Rotella Syn 5w40 in my wife's VW 2.0s (notorious oil drinkers) and they don't use a drop in 5k miles. I don't believe the oil itself is the problem, you have mechanical issues as mentioned above.

[ March 19, 2005, 07:19 PM: Message edited by: 99 ]

CJH · Mar 20, 2005

One thing I have noticed wtih my cars. When I change the oil, the level actually ends up a little about the full mark. As a result, it seems like oil consumption is less for the 1st quart. Next time you change the oil, see if the level on the stick is slightly above the full mark.

quote:

Originally posted by landtoy80:
I have a 94 Toyota LandCrusier. It has a inline 6 motor, 1FZ with 250,000 mi.
I am using RotellaT 5w40 syn oil.
When I first started to use it, I have several slow oil leaks. Over time the leaks stopped.

My oil consumption is my queation:
I don't have to add the first qt of oil untill I get about 2800 miles. After that I have to add a qt after about 1500 mi and again after about 1000 mi.
I try and change the oil at about 8000 mi and I use OEM Toyota filters.

Why does the the oil consumption go up as the oil gets old? It seams like as the oil get darker, the more oil its uses.
Is this normal or do I need to change something?

landtoy80 · Mar 24, 2005

When I change the oil, the oil is right on the full line.

I am not worried about the 1qt at the first 3000 mi.
I found it strange that the oil burns faster and faster after the first 3000 mi.

Had I did an oil change every 3000 mi, I wouldn't notis the increase in use. BUT that would be $$$ to change the syn oil every 3000mi.

How do you tell how an injector is bad without removing it?

Andrewsreef · Mar 24, 2005

LandToy80, I just did my first oil change with the Rotella 5W-40 from the Truck & SUV. We will see if my consumption improves. I hope I can get my LX450 to just a quart every 3k as I plan to change it every 5k.

I wonder if some of these trucks have some sort of fuel delivery problem for the oil consumption issue and the pinging issue (I have heard many complain about both). I think the injectors are a really big job and unless someone can tell me for sure I have a specific problem, I am not going looking.

Good luck

Andrew

landtoy80 · Apr 6, 2005

My strange oil consumption rate is still consistent.
Add 1 qt at 2800mi and 1qt after another 1200 mi.
I looked at my records and I had to add oil at 2700mi and 1 qt after another 1200 mi.
If I it stays consistent, I should add one more qt after anther 1000mi.

Don't know if its related but I have been getting a check engine light code 25 and 26.
Its means rich airfuel ratio and lean airfuel mixture.

Is this normal to have consumption at an increasing rate after oil change?

Does oil compsumption increase as the oil gets dirty?

TooSlick · Apr 6, 2005

Oil consumption can go up dramatically as the oil gets dirty, due to a compromised piston ring seal. The oil consumption you see with fresh oil is mostly from evaporation. These oil vapors are then drawn into the engine through the PCV system and burned in the combustion chamber.

Installation of a bypass filtration system will greatly reduce this oil consumption problem in high mileage engines by keeping the oil much cleaner....

Tooslick

Oil Consumption & RotellaT Syn

Similar threads