Oil change interval vs. Oil costs savings
 

A simple calculation:

Recommended oil change is usually every 5000 miles

Average fuel consumption is between 15 and 20mpg.
Lets calculate with the high side: 20mpg

That means we burn 250gal's of Diesel during one oil change interval.

Oil capacity is around 2gal.
That means total fluid consumption is 252gal.

Now lets extend the oil drain twice.
Fuel consumption is 500 gal and two gal of oil.
TotaL: 502gal.

So you burn 500gal of fuel to save 2 gal oil???

Thats a huge saving...:lol88:

Comments welcome

Thank you for moving it into the right thread!:tu:

:humm: Interesting.

Capacity is 3 gal. Fuel consumption is irrelevant WRT OCI. I look at it as 3 gal. of engine oil I did not have to buy.

Running the M1 5w/40 in the '07 sump now to 12k miles after a stellar oil analysis at 10k. Will probably be doing 15k OCI's after this year. Looks like I'll save AT LEAST $66. No subtract the oil analysis, so let's say $46. But I should only need one more analysis next year to determine my max OCI with this vehicle in this environment with this particular oil. :humm:

Well $88 ( --no $68?-- at $22/gal. I think it went up again), because my sump is 4gal., but that's another story. :w2:

Oh. almost forgot: Saved a filter, add another ~$10 to the total savings over time.

:pca1: wait your using mobil? atta kid!!

But I'm going with Rotella T6 next change. :hellox:

Who would save on an oil filter?

If the filtration capacity is depleted, it has to be changed anyway(within the recommended interval).
Otherwise the oil filter will go into bypass and what does that mean your engine?
:scare2:

Fuel consumption is not irrelevant. Good engine oil can decrease fuel consumption up to 3%, due to reduced resistance of moving engine parts - thats about 15gal in our example. It doesn't seem much. But it's enough for an extra gal of finest 1st class oil,
or
up to 300 extra miles.
:humm:

I change the filter when I change the oil. Who doesn't?
Maybe "insignificant" would be a better word? Anyway, 300 miles out of 12,000 is a small percentage and besides, this concept as you submit, is relative to the type of oil you are using, not how long you are running it.

I think you have some language barrier issues here, Stinker. :argh:

personally at that many miles i would change the filter twice, they not that much
i think with good oil you can easily run 10k or more, i took an oil sample with cheaper oil at 8000 and they said the oil was good but close to border line

It's pretty easy to tell if the filter is going in bypass, and mine never have, even running extended OCI's for over a year like I'm on with the '07 now. The longer you run them, the better they filter. I aso run big bypass filters on my rigs, so filtration is the least of my lube worries. :tu:

I think you will start to think about "savings" when you will have to pay 6,46$ per gallon as we have to do.

I always have a good smile when I hear about savings on oil, filters and fuel.
I have only 7quarts of oil in my pan- but that costs me 30$-US per quart.
Thats nothing very special over here.
And I have to change every 5000 miles.
Oil looks different after been used on the Autobahn with its high heat, high load demands.

It does not depend on language abilities.:moon: