hello everyone

i had bought recently 2010 LS460 with 62K miles only , the vehicle is in excellent condition and everything if perfect in it but i had noticed the oil level in the dipstick was low ( lower than the middle of 2 high and low points ) i thought the previous owner didn't fill it properly ,
i had replaced the engineer oil with genuine Lexus motor oil and it take around 8 litters. after driving the car for about 250 miles i had check the oil level and found it low ( same level before replacing it )
i didnt notice any blue smoke in the exhaust even the emission test was very successful ,
i had made a visual inspection for vehicle underneath to check if there is any oil leaks , but the vehicle was completely dry. .
now im worried what could be the cause of this oil consumption,
i appreciated that if anyone how faced same issue of mine


regards

 

Did you actually check the dipstick after the oil change?

 

When I do a diy oil change put in 10 quarts. It is a little high. I think capacity is 9.5 quarts for my AWD. 9.1 for rwd.

 

High is worse than slightly low just FYI

 

RWD 8.6 Liters
AWD 9.1 Liters

You may have just underfilled it. Try putting in another liter or so, monitoring the level and see what happens.

 

As Anfanger asked, did you check the level immediately after you changed the oil? Just keep checking it regularly and see what happens. Definitely never overfill it.

 

Stop using the recommended "mileage saver" viscosity and switch to Mobil 1 5W-40 Euro oil. Doing so may cost you .5mpg but the protection for longevity is absolutely worth it.

 

You will hurt it, don't exceed a 30 weight with these engines unless you are in be Middle East. The VVT systems are also designed for a given flow rate as are all the oil jets etc and main/rod tolerances. The high output versions of these engines all use 30 weights with the same clearances but with oil coolers to prevent sheet down from heat.

Engines should always use the oil that flows the fastest (aka actual lubrication and cooling) while sill maintaining the HTHS level needed to carry the load and heat demands. If you have a heavier oil weight than is needed for the load on the parts you will flow less past a given point and INCREASE heat and wear vs a lighter weight.

NOACK is not as much factor in non-turbo engines really so you don't need to worry about volatility as much but higher spec is always better.

 

At this mileage our big V8's are barely broken in, so I doubt any of the usual suspects - worn valves/valve seals, or piston ring wear - are the culprit. First thing I'd do (well, the second thing actually, right after changing the oil to 5w-30) is search the car's VIN on the Lexus site to find whatever maintenance history there is to find, especially oil changes. (When I searched for my 2017 LS460 I found several things the previous owner had done that I wouldn't ever have known about without the Lexus site: a new battery in 2022, a transmission flush, and even a brake fluid flush done at a dealership).

And when it comes to oil consumption issues, one important thing to know about the 1UR-FSE V8 is that it uses so-called "low tension" rings. A lot of carmakers use these in their engines in an effort to wring every last drop of MPG from the engine (which is also why Lexus specifies 0w-20 engine oil in American cars). But the trade-off is the low-tension rings are much more likely to stick in operation than the regular kind of rings, especially at the least build up of crud in the oil. And sticking piston rings could surely cause an increase in oil consumption.

I haven't had a problem with oil consumption yet on my car (2017 LS 460 with 70,000 miles). But only because I know this engine uses low-tension rings, I pour in a gas additive called "Yamalube Ring Free" at or about every oil change preventatively - and that's what I would try first.

 

Mine has always used some oil. Seems to be an issue with Toyotas first attempts at low tension rings. I just live with it and throw in a quart now and then as needed. I tried using heavier oil and it threw a p0012 cam intake motor code. Switched back and it went away. I guess it did not react fast enough with the heavier oil. Going to try Valvoline "Restore and protect" oil on the next change and see if that frees the rings up a bit.

 

If the oil consumption is really bad on these you can use a chemical treatment applied directly to the rings via the spark plug holes, I like B12 chemtool or aggressive fuel system cleaner like the VAG stuff. If it's not severe you can also just drive the hell out of the car to break everything free again.....and keep doing a WOT run every so often to keep them loose.

It works in any brand of car, took my personal 07 from 1.5 quarts in 500 miles to zero over 5-7k miles. I was able to just do the heavy handed approach with my car and after two weeks of DRIVING it back and forth to work (130 twice each way and dozens of full redline pulls every day) it stopped using any.

On a pair of customer cars I used the B12 method and it instantly fixed it. Same story with dozens of other Toyota engines, BMW, Hyundai, and a few Nissans as well. Never an issue and I always make sure it doesn't happen again by telling customers to actually fully utilize the engine they bought. The ones that shock me are people with faster car who never use the power they paid for....blows my mind you would pay for the big engine and not use it.

 

I've used Yamaha Ringfree once. Do you have any thoughts on B12 vs Ringfree?

 

I've not used it so I can't personally comment, I can only say I know directly applying B12 to rings does work.

I will also warn that you need to change oil right after doing the process as it will thin down from it, I think I mentioned that already but I'll say it again to make sure.

 

Agreed oil change right after. That's what I did because I introduced something "foreign" to the system.

 

yes