Developing Oil Life Calculator, see inside.

[randomhero439]

Originally Posted By: Quattro Pete
Originally Posted By: Vikas
what exactly is the value of the this exercise to the *other* people? certainly, it could be one of the factor that you could use in making your own decision about OCI but it is non-authoritative. It is a good and fun exercise but that is about it.

Agreed, and I'm assuming that BITOG members are treating it as such. I don't think anyone is just blindly accepting the OCI numbers coming out of this calculator and committing to adhere to them.




Exactly, to be perfectly honest, I dont even follow my own calculator.

As far as TS's formula goes, the fuel economy factor is completely relative to the car. Accord to TS's formula, A Ferrari getting 15mpg cruising on the highway is harder on oil than a Civic getting 25mpg with all city driving. My Accord gets about 21-23mpg with an autocross event on the tank. So is my Accord abusing the oil less than the cruising Ferrari?

Originally Posted By: RedHotOptima
Originally Posted By: Vikas


Some of you are getting pretty overboard with this.



Lol, I would think those like Pop and older members that are displaying anger towards a young man trying to make up an algorithum based on UOAs and past example calculations are the ones going overboard. Do those that question him really think you need 25 years experience in the field to create a generic equation?? This site is a great resource of UOA, perhaps better than many manufacturer's sample sizes. Nothing wrong with him taking a stab at it with these resources and fine tuning it based on the feedback in this very thread, etc.



Thats what im saying. I got bored in class and started playing with an equation. The basis of the equation: An conventional oil with a TBN of 7.0 can go 5000 miles on a V6/V8 engine. Synthetic-blend and full synthetic get minor factoring. Then i realized this was not adequate for most 4-cylinders that are easy on oil. "Nothing wrong with him taking a stab at it with these resources and fine tuning it based on the feedback in this very thread, etc." So i put in a little factor for forced induction engine and 4-cylinder engines. It ended up being fairly accurate.

 

[JHZR2]

Originally Posted By: Pop_Rivit
Originally Posted By: randomhero439

I have no specific oil related credentials. I can say im in school for Mechanical Engineering bachelor's degree with an Advance Mathematics minor. For a little while i was puzzled on how manufactures worked out the OCI they specified. As I did more research i came to the conclusion that most owners manuals makes "blanket statement" and apply the same OCI to their fleet. However usually there are a few cars that get special treatment, such as an SRT4 Neon. I focused on cars that got special treatment and read lots of UOA till i worked out a formula that did reasonably well with most cars i have tested it on. So yes im still new to this forum, but i learned quickly. Those questions i asked earlier, i had mostly already answered myself but i was curious what other people thought hence why i joined this forum. I do my research, i love oil, i love cars.


Ah-I see. Boiled down-you read about it on the Internet, and that made you expert enough to dispense oil change interval advice. You have time to do all of that, and you have time to answer all of the questions, but you don't have time to make your "magic spreadsheet" available for peer review.

I'll give you credit for your creativity, but nothing more.


So what credentials do you have for writing algorithms/maps/lookup tables for this kind of stuff? You do realize that is how this all works, right? Its all down to mathematical functions, of which you nor most anybody else would be able to make heads or tails of.

I'd love to know the basis of all the parameters in his equation and the basis for selecting the functions and mathematical rules he does in creating the algorithm... And hope they are shared. But at least as a MechE student acting on interest, he is doing something, rather than asking stupid questions or making excessively grumpy responses to things over and over. its clear that he figured out how to search and how to learn on his own.

 

[Nick R]

I'll play along.I have a couple UOAs to check against.

2011 Chevy Equinox 3.0L DI V6/Pennzoil Plat 5W-30
2013 Mazda CX-5/ 2.0L DI Skyactiv I4/Eneos (non sustina) 0W-20

Also run
2013 Ford Focus 2.0L DI I4/Motorcraft Blend 5W-20/PP 5W-30


and what the heck, check this one too
Also, 1998 Jeep Grand Cherokee 4.0L I6/QS Defy 5W-30

 

[Nick R]

Originally Posted By: JHZR2
Originally Posted By: Pop_Rivit
Originally Posted By: randomhero439

I have no specific oil related credentials. I can say im in school for Mechanical Engineering bachelor's degree with an Advance Mathematics minor. For a little while i was puzzled on how manufactures worked out the OCI they specified. As I did more research i came to the conclusion that most owners manuals makes "blanket statement" and apply the same OCI to their fleet. However usually there are a few cars that get special treatment, such as an SRT4 Neon. I focused on cars that got special treatment and read lots of UOA till i worked out a formula that did reasonably well with most cars i have tested it on. So yes im still new to this forum, but i learned quickly. Those questions i asked earlier, i had mostly already answered myself but i was curious what other people thought hence why i joined this forum. I do my research, i love oil, i love cars.


Ah-I see. Boiled down-you read about it on the Internet, and that made you expert enough to dispense oil change interval advice. You have time to do all of that, and you have time to answer all of the questions, but you don't have time to make your "magic spreadsheet" available for peer review.

I'll give you credit for your creativity, but nothing more.


So what credentials do you have for writing algorithms/maps/lookup tables for this kind of stuff? You do realize that is how this all works, right? Its all down to mathematical functions, of which you nor most anybody else would be able to make heads or tails of.

I'd love to know the basis of all the parameters in his equation and the basis for selecting the functions and mathematical rules he does in creating the algorithm... And hope they are shared. But at least as a MechE student acting on interest, he is doing something, rather than asking stupid questions or making excessively grumpy responses to things over and over. its clear that he figured out how to search and how to learn on his own.


J you know better, this is pop we are talking about. All he knows how to do is make grumpy, snarky comments.

 

[randomhero439]

Originally Posted By: Nick R
I'll play along.I have a couple UOAs to check against.

2011 Chevy Equinox 3.0L DI V6/Pennzoil Plat 5W-30
2013 Mazda CX-5/ 2.0L DI Skyactiv I4/Eneos (non sustina) 0W-20

Also run
2013 Ford Focus 2.0L DI I4/Motorcraft Blend 5W-20/PP 5W-30


and what the heck, check this one too
Also, 1998 Jeep Grand Cherokee 4.0L I6/QS Defy 5W-30


Goodness thats alot of DI engines

Chevy: 6220 miles or 8 months. On a non-DI engine this would be 9387 miles

Mazda: 5210 miles or 7 months. On a non-DI engine this would be 7798 miles

Ford: 5215 miles or 7 months (assuming a 50/50 mix). On a non-DI engine this would be 7811 miles

Jeep: 5568 miles or 6 months.

 

[Nick R]

Originally Posted By: randomhero439
Originally Posted By: Nick R
I'll play along.I have a couple UOAs to check against.

2011 Chevy Equinox 3.0L DI V6/Pennzoil Plat 5W-30
2013 Mazda CX-5/ 2.0L DI Skyactiv I4/Eneos (non sustina) 0W-20

Also run
2013 Ford Focus 2.0L DI I4/Motorcraft Blend 5W-20/PP 5W-30

Edit: The focus was for either one of the other. Those are the two I'll be considering using.

and what the heck, check this one too
Also, 1998 Jeep Grand Cherokee 4.0L I6/QS Defy 5W-30


Goodness thats alot of DI engines

Chevy: 6220 miles or 8 months. On a non-DI engine this would be 9387 miles

Mazda: 5210 miles or 7 months. On a non-DI engine this would be 7798 miles

Ford: 5215 miles or 7 months (assuming a 50/50 mix). On a non-DI engine this would be 7811 miles

Jeep: 5568 miles or 6 months.


The equinox sounds right about perfect.


The Focus is out of curiosity because I'll be getting it very soon and I was curious.

You may need to tweak the DI formula a bit though, I did an 8k run on the Eneos and it came out pretty well. see https://bobistheoilguy.com/forums/ubbthreads.php?ubb=showflat&Number=2823917&page=1

 

[randomhero439]

Wear metals seemed a little higher than normal, but i assumed it was from the engine still breaking in. TBN looked good. Only thing i see wrong is the viscosity and the fuel. Obviously due to a DI engine. The viscosity is kind of important lol. I read the thread and the point was made that Mazda expects this to happen is interesting to me. Im curious to see more UOA from this engine. As well as the Fords UOA.

How about the Jeep?

 

[C4Dave]

2002 Expedition 4.6 under 2 scenarios:
DD less than 5 miles per trip
Towing 3000 lbs for 20 miles+ per trip

SN Mobil 5000

Thanks!

 

[randomhero439]

Originally Posted By: C4Dave
2002 Expedition 4.6 under 2 scenarios:
DD less than 5 miles per trip
Towing 3000 lbs for 20 miles+ per trip

SN Mobil 5000

Thanks!


3823 or 4 months

 

[Pablo]

Originally Posted By: Quattro Pete
Originally Posted By: Vikas
what exactly is the value of the this exercise to the *other* people? certainly, it could be one of the factor that you could use in making your own decision about OCI but it is non-authoritative. It is a good and fun exercise but that is about it.

Agreed, and I'm assuming that BITOG members are treating it as such. I don't think anyone is just blindly accepting the OCI numbers coming out of this calculator and committing to adhere to them.




Originally Posted By: Quattro Pete
Originally Posted By: Pablo
And why are the few old timers here not posting TS's formula or even remembering this old stuff?

I posted it, if you go back a few pages.


Sorry QP, I missed it. My mistake. There have been some other formulas in the past as well. I meant no animosity toward anyone. I was curious how they compared and such, some people seemed like this was a whole new idea.

 

[TacoToy]

When you get the opportunity I would like estimates on the following vehicles:

1. 2010 Chevrolet Equinox - 2.4 L DI - Valvoline NextGen 5W-30 SN

2. 2012 Audi Q5 - 2.0 L Turbo TSFI - Castrol Syntec 5W-40 SM

Thanks!

 

[randomhero439]

Originally Posted By: TacoToy
When you get the opportunity I would like estimates on the following vehicles:

1. 2010 Chevrolet Equinox - 2.4 L DI - Valvoline NextGen 5W-30 SN

2. 2012 Audi Q5 - 2.0 L Turbo TSFI - Castrol Syntec 5W-40 SM

Thanks!


Chevy: 3528 miles or 4 months

Audi: 6350 miles or 8 months

 

[berniedd]

Here's mine:

1998 Honda CRV 2.0 liter engine
Mag1 15W-40 SM (dino oil)

2012 Honda CRV 2.0 liter engine
Mobil 1 0W-40 SM

2007 Kia Sportage 2.0 liter engine
Castrol Edge 5W-40 SM (synthetic)

Nissan Sentra 1.6 li ter engine
Shell Helix 15W-40 SL (dino oil)

 

[gfh77665]

2006 Honda Odyssey, 3.5 (non VTEC!) Pennz Platinum 5-20

2000 Chevy Silverado 5.3 NAPA Synthetic 5-30

1997 Chevy C1500 4.3 Mobil 5000 5-30

2002 Lincoln Continental 4.6 Motorcraft 5-20

1995 Chevey Caprice 4.3 (V8) O'Reillys 5-30


Thanks you 439.

 

[Vikas]

Quote:
2006 Honda Odyssey, 3.5 (non VTEC!) Pennz Platinum 5-20


There is NO SUCH THING! You probably meant NON VCM! Apart from the letter V for "variable", those two system have nothing in common.

 

[gfh77665]

Originally Posted By: Vikas
Quote:
2006 Honda Odyssey, 3.5 (non VTEC!) Pennz Platinum 5-20


There is NO SUCH THING! You probably meant NON VCM! Apart from the letter V for "variable", those two system have nothing in common.


YES YOU ARE RIGHT. I MADE A TYPO MISTAKE.

Thank you for correcting my error!

 

[TheBig2003]

Hey randomhero439. What about these two:

2006 Chevrolet Colorado 3.5 I5 running Pennzoil Conventional
and,
2007 Chevrolet Cobalt 2.2 L4 running Valvoline Conventional

Thanks!

 

[randomhero439]

Originally Posted By: berniedd
Here's mine:

1998 Honda CRV 2.0 liter engine
Mag1 15W-40 SM (dino oil)

2012 Honda CRV 2.0 liter engine
Mobil 1 0W-40 SM

2007 Kia Sportage 2.0 liter engine
Castrol Edge 5W-40 SM (synthetic)

Nissan Sentra 1.6 li ter engine
Shell Helix 15W-40 SL (dino oil)


NEW FORMULA!
98 CR-V: 6407 miles or 5.8 months 12 CR-V: 11377 miles or 13.7 months
Kia: 10551 miles or 12.7 months
Nissan: 6278 miles or 7.5 months <--- GA16DE?

 

[randomhero439]

Originally Posted By: gfh77665
2006 Honda Odyssey, 3.5 (non VTEC!) Pennz Platinum 5-20

2000 Chevy Silverado 5.3 NAPA Synthetic 5-30

1997 Chevy C1500 4.3 Mobil 5000 5-30

2002 Lincoln Continental 4.6 Motorcraft 5-20

1995 Chevey Caprice 4.3 (V8) O'Reillys 5-30


Thanks you 439.


NEW FORMULA!
Honda: 8121 miles or 9.7 months
Silverado: 8056 miles or 9.7 months
C1500: 4911 miles or 5.9 months
Lincoln: 6470 miles or 7.8 months
Caprice: 4790 miles or 5.7 months

 

[randomhero439]

I developed a new formula today after an intriguing lecture in my differential equations class. It is completely different than the old one.