Honda Car Forum

rev_otis_mcnatt@yahoo.com wrote:

>
> Here is the formula BMW uses for their oil change messaging:
>
> e = a(1 + t + r) = estimated mileage
>
> a= actual mileage
>
> t = 1 if engine temp below operating temp, else t = 0
>
> r = .5 if engine above 4500 RPM, else r = 0
>

1) How do you know this is so for modern BMWs?
2) What makes you sure Honda is using this formula as well?

>
> Here is the formula BMW uses for their oil change messaging:
>
> e = a(1 + t + r) = estimated mileage
>
> a= actual mileage
>
> t = 1 if engine temp below operating temp, else t = 0
>
> r = .5 if engine above 4500 RPM, else r = 0
>


That "formula" doesn't make any sense. Hint, it should be a summation
of discrete events or an integral.

On Oct 28, 12:45*am, John Horner <jthor...@yahoo.com> wrote:
> rev_otis_mcn...@yahoo.com wrote:
>
> > Here is the formula BMW uses for their oil change messaging:
>
> > e = a(1 + t + r) = estimated mileage
>
> > a= actual mileage
>
> > t = 1 if engine temp below operating temp, else t = 0
>
> > r = .5 if engine above 4500 RPM, else r = 0
>
> 1) *How do you know this is so for modern BMWs?

http://www.bimmerzone.com/resettoolabout.htm

Still used as of at least 2007 models.
BMWs require these tools for resetting fault codes
and service lights. I still have mine.

> 2) *What makes you sure Honda is using this formula as well?

I never said I was sure they did. One thing I've learned here
is that Honda posters seem to make stuff up when they feel
like it, which is often for some of the dimwits here.

But what makes you think Honda isn't using it? My guess, judging from
Honda's silly oil change-driven Maintenance Minder reminder system,
is that their estimations might be even more crude.

It still amazes me that they would come up with a system that
never will remind an owner of any required maintenance (tire
rotation, filters, all the rest) unless said owner lets the Oil
Life get down to 15%. A typical clueless owner who, say,
changes their oil ever 4k miles, and resets, will never get
any indication that other things need to be done. They
could drive the car for many tens of thousands of miles
and think things are just fine & dandy.

On Oct 28, 12:48*am, John Horner <jthor...@yahoo.com> wrote:
> > Here is the formula BMW uses for their oil change messaging:
>
> > e = a(1 + t + r) = estimated mileage
>
> > a= actual mileage
>
> > t = 1 if engine temp below operating temp, else t = 0
>
> > r = .5 if engine above 4500 RPM, else r = 0
>
> That "formula" doesn't make any sense. *Hint, it should be a summation
> of discrete events or an integral.

If you had read and let sink in my own comments on this formula, you
would
see that I am critical of it too. Not only should it be an integral,
but I have
always felt it left out the most important factor: engine run time, as
I have
stated here in other posts.

I think you give automakers too much credit.