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Open Roads Forum  >  Class A Motorhomes  >  Maintenance Issues & Tips

 > Never needs an Oil change!

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Lobstah

Gulf Coast

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Posted: 09/24/13 03:44am Link  |  Quote  |  Print  |  Notify Moderator

ScottG wrote:

This is a really good lesson for all of us to demand to see a maint. log no matter how nice the rig or walk away from it.


Rather than walk away from no maintenance log, I think a better idea is to have the analysis done on a rig you're thinking of buying, whether they have a maintenance log or not.
As stated before, the analysis tells you a lot about what's going on inside that motor...a maintenance log will tell you when things were done, maybe, but it doesn't tell you how they were done or if they were done right.

Get the analysis, and remove all that unknown info from the equation.
Fairly common practice in boats.

Jim


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Tvov

CT

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Posted: 09/24/13 04:23am Link  |  Quote  |  Print  |  Notify Moderator

I thought a lot of big rigs use bypass oil filters in addition to regular oil filters. I assumed that is why they extend their complete oil changes.


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JetAonly

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Posted: 09/24/13 06:46am Link  |  Quote  |  Print  |  Notify Moderator

FWIW Cummins says specifically not to use UOA to extend oil change interval. Mine uses about 2 qt in 10k miles. To extend drain interval safely you need regular oil sample to develop trends. $40 for an UOA that has acid numbers and base numbers. Pretty quick you've paid for an oil change.

I think the reason he uses a qt every 1k is because he doesn't change the oil.

IMO


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Daveinet

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Posted: 09/24/13 07:16am Link  |  Quote  |  Print  |  Notify Moderator

The biggest problem that I see is the size of the oil return passageways are not big enough to not clog from sludge. As soon as the sludge starts to build, the passageways are cut off. The oil flow is slower, which means it does not wash the sludge away, so even more builds up. Eventually you end up in a runaway condition.


IRV2

tempforce

Oregun Pacific Wonderland (in the summers)

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Posted: 09/24/13 07:31am Link  |  Quote  |  Print  |  Notify Moderator

if he had a centrifugal oil cleaning system drawing from the bottom of the drain pan. and he changed the oil filter every 10,000 miles. i would say. no problem….
but the heavy sludge stays on the bottom, thus never getting changed/removed… eventually the oil pickup will get plugged… then bad things will happen…..


somewhere in the texas 'lost pines'
currently without rv.
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downsizing from a 1 ton diesel and a 32' trailer, to a 19-21' trailer for the '56'.

Lobstah

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Posted: 09/24/13 07:34am Link  |  Quote  |  Print  |  Notify Moderator

JetAonly wrote:

FWIW Cummins says specifically not to use UOA to extend oil change interval. Mine uses about 2 qt in 10k miles. To extend drain interval safely you need regular oil sample to develop trends. $40 for an UOA that has acid numbers and base numbers. Pretty quick you've paid for an oil change.

I think the reason he uses a qt every 1k is because he doesn't change the oil.

IMO


Blackstone charges $25.

http://www.blackstone-labs.com/diesel-engine.php

Jim

JTHarley

Northeast, Michigan, USA

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Posted: 09/24/13 07:35am Link  |  Quote  |  Print  |  Notify Moderator

REALLY!! This has to be a joke or a very very uninformed individual on how internal combustion engines work. Wow, I've heard some silly theories before but this one is right up there.


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BigRabbitMan

Cottage Grove, OR

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Posted: 09/24/13 09:31am Link  |  Quote  |  Print  |  Notify Moderator

This theory/practice has been around as long as there have been engines. To debunk it one just has to see the inside of a engine that has been treated this way for awhile. It's his engine and he can kill it any way he wants to kill it!


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NMace

Central Arkansas

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Posted: 09/24/13 11:26am Link  |  Quote  |  Print  |  Notify Moderator

Lobstah wrote:

JetAonly wrote:

FWIW Cummins says specifically not to use UOA to extend oil change interval. Mine uses about 2 qt in 10k miles. To extend drain interval safely you need regular oil sample to develop trends. $40 for an UOA that has acid numbers and base numbers. Pretty quick you've paid for an oil change.

I think the reason he uses a qt every 1k is because he doesn't change the oil.

IMO


Blackstone charges $25.

http://www.blackstone-labs.com/diesel-engine.php

Jim


Let's see, I can change my oil or have it tested to see if I need to change it for about the same cost. I think I will just change it.


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Daveinet

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Posted: 09/24/13 11:31am Link  |  Quote  |  Print  |  Notify Moderator

You may end up with less than the minimum intended additives. For instance, if I went by the specs in my engine, I have a 10 qt oil pan and need to change the oil every 6000 miles. So, if I add 1 qt every 1000 miles, that would mean that at the end of 6000 miles, I would have only changed 6 qts of oil, and not the full 10. This would mean that I was depleting additives faster than I would be replenishing them, so the concentration of additives will be less than the minimum. So even without the consideration of getting rid of the sludge, the concentration additives will be diluted with old oil. Basically I would be running my engine with the concentration of additives equivalent to changing it every 10,000 miles, not 6000, well below the minimum all the time.

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