Lubricant Enginners 8800 Monolec Ultra

Joined
Sep 20, 2025
Messages
1
So basicly I want to know what you guys think of this oil spec in general (LE 8800 Monolec Ultra). My dad swears by it but nobody in my country seems to know this brand of Oil (Lubrificant Enginners).
Most American oils are in fact not very well know here in my country (Portugal), like Redline, Royal Purple, Amalie etc...
I always got told that oil and lubrificants in general make 50% of a mechanic and since Im starting to know the trade this was always a question I wanted to about... Basicly a comparison of some 15w40.I think for example LE doesnt make a 5w40 because of the shear perfomance of a 5w40 svs a 15w40.
Another point worth noting is the package itself, says that no other oil will be found in superior condition at the end of any period of use. Also Im pretty much a noob if I said anything wrong please do point it out! Thanks in advance.

20250603_092915.webp
 
Last edited by a moderator:
We used the LE 15w-40 in a V-16 turbo Cummins generator ( 52 gallons) with no problems at all in past, also used their ultra plex ? grease to .was better than the runny Mobil grease. Highly recommend their products, even so pricy.
 
Lubrication Engineers does make a 5w-40. It's their 8854. I ran their 8800 in a 6.0 Powerstroke with great success. I ran it year round and it cold started great, better than a friend of mines 6.0 that always ran 5w-40 Rotella. I also use their grease and as mentioned it doesn't melt out of the gun at all. I would use any of their products without hesitation.
 
I used their product 8531 5W-30 in one of daily driver cars years ago. It was an amazing product, better than the rest as far as improving engine performance just by using it compared to using the majors. It was expensive, because of that I never reordered it. Great oil.

https://www.lelubricants.com/wp-content/uploads/pdf/flyers/8511-8531 Product Info.pdf
Just shows that there's more to oil than paper specs. The 2.8 HTHS of their 5w-30 is quite underwhelming for a 30 grade. But I'm sure the oil performs superbly, notwithstanding a spec sheet.
 
What kind of engine performance was improved compared to the majors?
That product 8531 may have been my first experience with "better" oils. It gave that infamous "butt dyno" improvement and also made the engine run quieter. I have had the same effect with using Royal Purple HPS and Schaeffer 9000 15W-40 when I ran and owned my own OTR trucks. It is a difference you will only notice if you are used to driving the vehicle you start to use whichever product in. On my big truck years ago, it had a Series 60 Detroit Diesel with a 13 speed Eaton transmission. That truck pulled better and increased my fuel milage average 1.5 to 2 mpg by running the Schaeffer 9000. Anyhow, the LE 8531 5W-30 is good stuff, or at least it was back then.
 
That product 8531 may have been my first experience with "better" oils. It gave that infamous "butt dyno" improvement and also made the engine run quieter. I have had the same effect with using Royal Purple HPS and Schaeffer 9000 15W-40 when I ran and owned my own OTR trucks. It is a difference you will only notice if you are used to driving the vehicle you start to use whichever product in. On my big truck years ago, it had a Series 60 Detroit Diesel with a 13 speed Eaton transmission. That truck pulled better and increased my fuel milage average 1.5 to 2 mpg by running the Schaeffer 9000. Anyhow, the LE 8531 5W-30 is good stuff, or at least it was back then.
Ah yes, the always amazing butt dyno. I do realize it couldn't have been anything else.
 
Last edited:
Ah yes, the amazing butt dyno. I do realize it couldn't have been anything else.
I have always been too tight to buy the boutique oils like Amsoil, HPS, Red Line etc, but I would have to guess there are butt dyno effects when using those products? The Schaeffer 9000 oil I ran in my OTR truck definitely caused improvements over running the Mobil Delvac 15W-40 back then. The Delvac was not a synthetic engine oil, where the Schaeffer 9000 is. That probably made the difference. I speced and bought that truck brand new, ran it over a million miles myself. Using the Schaeffer 9000 made a significant improvement/ difference in that truck's performance. I question if these days, with the required improvements in government oil specs if these things are even that noticeable anymore? Anyhow, LE probably still makes good lubricants.
 
What were those?
Mainly, it was fuel milage, 1.5 mpg on average improvement. The feel in the seat of your pants thing was there too, but fuel cost is the biggest expense of running an OTR truck, you notice that first. I kept constant tank to tank and monthly fuel milage on that truck. The Schaeffer cost more than the Delvac, Schaeffer was more trouble to deal with supply and that kind of thing, Schaeffer did pay for itself as long as I used my distributor to buy it, ole LeRoy (RIP) gave me a decent price for the 9000.
 
I have always been too tight to buy the boutique oils like Amsoil, HPS, Red Line etc, but I would have to guess there are butt dyno effects when using those products? The Schaeffer 9000 oil I ran in my OTR truck definitely caused improvements over running the Mobil Delvac 15W-40 back then. The Delvac was not a synthetic engine oil, where the Schaeffer 9000 is. That probably made the difference. I speced and bought that truck brand new, ran it over a million miles myself. Using the Schaeffer 9000 made a significant improvement/ difference in that truck's performance. I question if these days, with the required improvements in government oil specs if these things are even that noticeable anymore? Anyhow, LE probably still makes good lubricants.
All I can say is that you have an amazing butt dyno. Mine has never detected a performance difference in oils.

Good jeans genes maybe.
 
Something that is routinely misunderstood and/or ignored by many.
I am not ignoring, nor do I not understand how to figure real world mpg and cost/gallon of fuel. My lab was sitting in the cab of my truck using a handheld calculator and notebooks to record my results for years and millions of miles in the various trucks I owned and drove through the years in all climates in the USA and southern Canada. Also, the fuel cost is the highest expense operating trucks used to deliver freight, next is driver wages. I am not sure if I am being teased here or you guys actually think I don't know how to figure this stuff. Less fuel being burned translated to more money left to buy groceries later. It is pretty simple actually. I can't supply a computer read out on my years of fuel milage reports, increases and decreases. The use of some engine oils can and will cause improved performance over the use of a different engine oil of the same viscosity. I would like to know how that is accomplished, improved ring seal? I don't know, but I know it is true, and I have experienced it many times through the years. I am just stating what I have learned with real world experience and sharing those experiences. I am not discounting "lab-controlled results", however there are other ways to notice changes, good or bad, in engine performance other than lab results.
 
I am not ignoring, nor do I not understand how to figure real world mpg and cost/gallon of fuel. My lab was sitting in the cab of my truck using a handheld calculator and notebooks to record my results for years and millions of miles in the various trucks I owned and drove through the years in all climates in the USA and southern Canada. Also, the fuel cost is the highest expense operating trucks used to deliver freight, next is driver wages. I am not sure if I am being teased here or you guys actually think I don't know how to figure this stuff. Less fuel being burned translated to more money left to buy groceries later. It is pretty simple actually. I can't supply a computer read out on my years of fuel milage reports, increases and decreases. The use of some engine oils can and will cause improved performance over the use of a different engine oil of the same viscosity. I would like to know how that is accomplished, improved ring seal? I don't know, but I know it is true, and I have experienced it many times through the years. I am just stating what I have learned with real world experience and sharing those experiences. I am not discounting "lab-controlled results", however there are other ways to notice changes, good or bad, in engine performance other than lab results.
In short, you cannot determine if the oil yields better or worse MPG, unless a controlled test is performed.

Seat of the pants dont cut it.
 
In short, you cannot determine if the oil yields better or worse MPG, unless a controlled test is performed.

Seat of the pants dont cut it.
Seat of the pants may not determine a difference in fuel milage, obviously, but a calculator and a log driving the same truck thosands of miles a week for months and comparing the result to the previous results on the same routes, loads and outside temperatures, you can notice a difference if the change is significant enough. .01 mpg, probably not. I understand the only correct way to be precise is your way. I actually would like to see the "lab results" on these oils I compared, something has to be different causing less friction, and beter fuel milage. I have to concede, the only absolute way to know is what you are saying. I didn't have access to the labs, machines and engines you are talking about. I only had my trucks and calculator. There are so many uncontrolled variables in real world tests. All I really have here is opinion and a lifetime of experience on some things that work and some that don't. It is all opinion, not necessarily fact in the eyes of others.
 
Well in the BITOG World, Real World experience doesn't cut it.

Unless your scenario was ran in a lab, calculations ran through a TI-83 and cross-checked with a Casio CA-53W, and the results published, it just simply does not compute and therefore can not be believed.
 
Last edited:
Well in the BITOG World, Real World experience doesn't cut it.
Field tests are important. Industry experts, such as @Tom NJ stress it often. But your real world experience is muddied by 1000's of variables, from which you cannot isolate a single one as being the determining factor of whatever you want to prove. In this case, MPG.

You need a lab-controlled test for this.
 
Back
Top Bottom