I keep trying to bring it back around to that lol

I’m sure it does have an impact. Remember though, 9.3 quarts of oil. TGMO retails for like 7.50 a quart. That’s $75 just for the oil. Shop supplies, filter and disposal, taxes, 30 min labor at a labor rate of $140 an hour and there ya go.

 

When I reference new engines, I mean all new engines. The 1990 4.0 burns more when "new" ...not newer designs

The 4.6 engine in the GX is the same UR as the LS460 with no DI. It uses the same amount of oil as the LS460. The outgoing 4.7 used less oil by 2.5 qrts. I think the engine design has a lot to do with it as well as the oil used. But yes, looks like Lexus might of compensated for more engine burn. A Lexus LFA uses 18qts to fill, it is 4.8 I think the higher the performance engine will have a lot do with engine oil consumption as well.

An LFA using 1.1 qts at 600 miles is completely normal. I doubt any car using a qtr at 500 miles is normal, and I never said that was the case.

Moving on....from a fascinating discussion

 

I think you’re misunderstanding what "using oil" means. The 4.6 in the GX is not DI, it holds about a quart less oil than the LS460 does. The amount of oil capacity in the sump doesnt have anything to do with oil usage, we're talking about oil being burned and needing to be topped off. Go in the GX460 forum and look for posts about high oil consumption. Look for those posts with the Tundra, and the Sequoia. Its clear that the FSE uses more oil once they age than the FW does and the only reason is the DI.

Bringing it back to the original topic, modern vehicles are more apt to use oil as they age than older vehicles, and that oil consumption is one example of why consumers may feel they arent as reliable as older cars.

 

The new models are more expensive to service. More expensive oil for the new models such as synthetic. More oil in some cases as well.

 

Yep, even at a Jiffy Lube an oil change for this car is over $100.

 

Who would take a LS to Jiffy Lube LOL?

 

Not me lol, just as an example!

My dad had a friend who had his GS400 back in the late 90s ruined by JL. They didn’t fill the oil back up.

 

I have always just gone to the Toyota or Lexus dealer.

 

Here is the opinion of Mobil.

https://mobiloil.com/en/search?q=burning%20oil

 

......and that means, on a level surface, after the engine has been off for awhile, opening the hood (even with a manual prop-rod LOL), grabbing the dipstick (if equipped with one), wiping it off, re-inserting it, pulling it out again, and actually looking at the level, not necessarily just trusting it to an electronic sensor or display that can fail.

 

Yes, I sure hope none of you go to Jiffy Lube.

This old lady from my childhood, family friend, had a brand new Mitsubishi Diamante (those were actually sweet for the time, the 1st gen at least) that was ruined because they didn't put the plug back in.

 

I am not missing the point here at all. You've literally quoted it yourself from the AMSoil website.

Yes DI can cause oil consumption at high mileage. Yes, it is a fact. The reason why is because it degrades your oil film which in turns causes increased wear on moving parts.

Yes, oil does play a huge role by cushioning and preventing friction between the cylinder wall and piston ring - • Reduced oil viscosity interferes with formation of a durable lubricating film, inviting wear. Combustion-zone parts are especially prone to wear, including the pistons, rings and liners. Reduced viscosity also negatively affects the oil’s ability to function as a hydraulic fluid, which is critical in engines with variable valve timing.

This statement is 100% correct.

other than using better quality and higher viscosity oil, your only other real choice is to change your oil more often. After 4000 miles, depending on which oil you use, there is not much protective properties left within the oil, because DI has sheared it down. Since the oil is sheared down and diluted with fuel, the piston ring cannot maintain as good of a seal, which invites oil consumption. The piston ring cannot play its role in maintaining a seal between the cylinder wall without adequate oil supply - period.

So what am I missing here?

 

Which is why I change my oil at 5k miles instead of the suggested 10k.

But, that does not guarantee that I won't have high oil consumption as the engine ages due to the stress the DI system puts on the seals and rings. Also, 99% of owners will simply follow the maintenance schedule which specifies 10k changes, and dealerships simply perform 10k changes also. The dealer looked at me like I had 3 heads when I told them I wanted to change the oil at 5k miles. Many people with high mileage cars also bought them used and have no idea how they were maintained.

The point is, these engines will likely require more maintenance as they age vs older non DI engines, which is the topic of this thread, has Lexus quality declined....when a Lexus owner's 150k mile LS460 uses a quart of oil every month, they're going to feel that it has.

 

So our primary concern here is fuel dilution.

According to you, the LS460 has 9 quarts of oil, which is a lot.

This means that warm up period becomes even more pertinent. Until you get the engine oil good and hot for at least 10 minutes, you wont get a chance to burn excess fuel out of your engines crankcase.

This is why changing oil somewhere in the tune of every 3000 miles on a car which sees short distance driving in the city is totally fine if not recommended, especially if you drive in cold weather.

Try smelling the oil on your dipstick after driving less than 20 minutes vs. 30+ minute drive. You'll be able to smell fuel in your oil if its after a short drive.


Especially with DI motors, the way your oil smells will tell you a lot about what is going on inside your engines and when its time to change.

Fuel system cleaner, as well as inspecting your injector spray pattern and replacing injectors as needed at higher mileage would be a good idea.

To add to your point re Lexus quality, there is a possibility that they are using cheaper quality piston rings with the newer engines which tend to wear out after 150k miles.

Truthfully speaking, the pattern you see with DI reliability could just be a bad batch of cars which maybe see a lot of cold short distance aggressive driving, abused when new, 10k oil changes its whole life,

I'll mention it again. Severe fuel dilution issues are still completely possible with port injection, in the case of faulty injectors, and especially bad piston rings.

In your case, as the mileage increases, certainly wouldnt be a bad idea to switch to thicker oil.

For those of you experiencing oil consumption, use thick oil.

 

Ok you guys went straight back to oil changes, oil consumption, etc.

closed.