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Old 03-01-2020, 03:56 PM   #85
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With only 700 miles...I would be very suspect of your diesel. I would definitely replace the fuel filters!

When you say suspect of my diesel are you referring to how old vrs fresh the fuel is? I do top it up twice per year.
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Old 03-01-2020, 04:29 PM   #86
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With only 700 miles...I would be very suspect of your diesel. I would definitely replace the fuel filters!
I would also change fuel filters(in addition to carrying spares) and add a diesel fuel additive to combat algae growth.
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Old 03-01-2020, 04:30 PM   #87
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Nope! Leave it alone. If your worried, have the oil tested
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Old 03-01-2020, 04:36 PM   #88
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We change every year while our coach is in winter storage. I am more concerned about water and contaminants that can collect over time, regardless of miles. That's me. but with that said, you are probably fine forgoing the change with only 700 miles
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Old 03-01-2020, 04:54 PM   #89
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Well you asked so here is my opinion, I change all filters once a year or 10k miles whichever comes first regardless what vehicle I have.

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Old 03-01-2020, 04:55 PM   #90
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700 miles? You should saved money and got a single wide. Less money and better quality. No motor.
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Old 03-01-2020, 05:00 PM   #91
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Modern oils donít meet the annual oil change criteria. That is a very outdated standard based on obsolete oils that would start breaking down with age, but even then, a year wasnít a big deal. Now itís meaningless. So itís not about saving the cost of an oil change, itís about addressing those things that matter and not performing needless tasks based on the calendar.
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Old 03-01-2020, 05:37 PM   #92
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Oil Service

I would change the oil Filter and top off. I would also send in a oil sample first.

This will start a war, but those of you who know oil realize that moisture / condensation has been deposited into that oil with heat in the day vs cool night temp swings

Also manufacturing has learned that a oils Additive package can break down from sitting idle with the oxygen in the crankcase.

An oil analysis after being driven and warmed up will give you the best reality check. If not a new filter and a couple quarts may replenish the additives in your oil.

Better to drive them than let them sit. Water will also build up in the rear differential and transmission. A hot run usually boils it off.
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Old 03-01-2020, 05:56 PM   #93
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From the Cummins manual:

Oil Analysis
Oil analysis, as a method to extend drain intervals, is NOT recommended. Different methods of measuring soot, lack of correlation among testing labs, and differing driving patterns and idle time are the basis of the recommendation.
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Old 03-01-2020, 06:05 PM   #94
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Annually, unless you can confirm that you are not using it in areas where condensation is NOT a problem. Moisture will condense in the engine and the fuel tank contaminating engine oil and fuel. Water in fuel will lead to black algae, read bad stuff. The cost to change the oil and filters relative to repair an engine. Engine oil and fuel analysis will identify the health of the oil.
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Old 03-01-2020, 06:26 PM   #95
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When you say suspect of my diesel are you referring to how old vrs fresh the fuel is? I do top it up twice per year.
Yep...all diesel is biodiesel to some degree. After time, algae will grow. Your filters are your primary line of defense. With only 700 miles in a year, your fuel is very old (regardless whether you top it off or not). As stated above, with diesel sitting that long, be sure to have an additive that will stop algae from growing.
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Old 03-01-2020, 06:29 PM   #96
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I would have an oil sample test and maybe oil filter only change if test is good
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Old 03-01-2020, 06:49 PM   #97
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You mention that my oil must be black. Yes it is black and has been from day one. In fact i have never seen any other color in any diesel vehicle that i have operated. If gold colored oil is desired i think we would be changing our oil daily or switch to a gas engine. Black oil is normal in a diesel engine.
Do you have a diesel engine? If so do you have clear gold oil?

Keep in mind that even when you change your oil, there is still a 1/2 quart of old oil left in the corners and out of way places. Some mechanics even suggest to crank the engine a couple of revolutions when draining the oil to get the last cup of old oil out of the oil pump. Yes, my diesel engines all have black oil shortly after start up. Black oil is a indication of how dirty the inside engine compartment really is which is another reason to frequently change the oil like the manufacture suggest.
I change my Duramax using synthetic oil at 6 month intervals which is about 5000 miles. My oil sample results show I could go 10k miles which I would do if I got in a jam. But I would much rather error on the safe side and the $50 DIYS cost is good entertainment for me.
Vehicle manufactures used to suggest oil changes be done every 6 months and some now have increased that period to annually. I am not aware of any vehicle manufacture that suggest extended periods beyond 1 year for oil changes.
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Old 03-01-2020, 07:00 PM   #98
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At least once a year depending on miles driven or hours run. Same with the generator. Once you run your engine the contaminants get in the oil, if you just leave it in the engine for several years even at low miles you are going harm yo your engine. If you use it at all you should change it in both the generator and coach. Just good practice plus it keeps the moisture out of your oil. If you canít afford to do this annually then you probably shouldnít own the coach.
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