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Old 02-21-2015, 08:31 AM   #1
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Synthetic oil

If I use synthetic oil can only change every 10,000 miles versus 5000 miles for regular oil.
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Old 02-21-2015, 08:43 AM   #2
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Mobile1 Extended Performance is marketed to be good for 15k miles so it should be good for 10k miles. Use their Extended Performance oil filter too. If your vehicle is still under warranty then the vehicle manufacturer's maintenance schedule must be followed regardless of the oil used. https://mobiloil.com/en/motor-oils/m...ed-performance
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Old 02-21-2015, 09:15 AM   #3
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What engine? Gas or diesel?
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Old 02-21-2015, 09:26 AM   #4
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Hi WReeder,
If you can get the 10K done within a year, you should be okay. However, most coach fluid changes are done by time. For engine oil that is one year maximum. It matter not if dino or synthetic is used.
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Old 02-21-2015, 11:32 AM   #5
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Yes you can.

If you get your oil sample analyzed by a lab before changing the oil you can request the TBN result.

That analytic will tell you how capable your oil is of absorbing additional contaminates for an extended oil change period.

I do not know if your engine manufacturer recommends longer intervals for synthetic vs dino oil.

An example of a lab report is available in another thread currently active on this forum.
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Old 02-21-2015, 11:42 AM   #6
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Quote:
Originally Posted by vsheetz View Post
What engine? Gas or diesel?
Not many Diesel engines call for 5K oil changes that I know of.
My small ISB is 15K or 1 year.

Probably the same as the OP calls for 5K it probably is also a 1 year regardless of miles under the 5K
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Old 02-21-2015, 12:15 PM   #7
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Quote:
Originally Posted by WReeder View Post
If I use synthetic oil can only change every 10,000 miles versus 5000 miles for regular oil.
Its a gas 8.1, we traveled 10K last years performed oil change three times. Also if I use it in my onan 5500 can I increase the oil changes there also, I put 400 hours on it last year and changed the oil three times also?
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Old 02-21-2015, 03:02 PM   #8
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I think you are asking if you can reduce the oil changes and still avoid engine damage.

No-one on this or any other forum can assure you that a different schedule will be harmless or harmful.

Oil changes are a precaution. The timing is not absolute.

You will need to forum your own opinion as to what you "can" do if you want to deviate from the manufacturer's recommendation.

If still in warranty, do not deviate.

Oil analysis will help you form that opinion and take action with a better grip on the status of your engine.
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Old 02-21-2015, 03:21 PM   #9
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My dad told me something.....Oil doesn't wear out, it gets dirty.......Synthetic oil is going to get just as dirty as conventional.
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Old 02-21-2015, 04:56 PM   #10
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No engine manufacturer will extend the owners manual oil change interval, regardless of oil type.
You might find this old irv2.com thread interesting: Synthetic oils - aren't
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Old 02-21-2015, 05:07 PM   #11
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The answer depends on the oil.. There are TWO as far as I know that are actually synthetic,, Mobile 1 (At least some versions of it) are on that like.. Amsoil is the other.

Most of the others are really Dino Oil that has been very highly refined, it is better than "Regular" but it is also natural oil.
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Old 02-21-2015, 08:06 PM   #12
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you dont have enough oil in a gasser to extend the oil change interval. Diesels have 5 gallons+, gassers have a gallon and a half+/-. Thats the primary reason.

Blowby in a gasser dilutes oil much faster than what happens in a diesel. Gasoline is pretty much a solvent when you compare it to diesel fuel. Thats the secondary reason.

But use synthetic in the gasser anyhow, it's better oil. Rotella T6 is also a full synthetic.
Quote:
Shell Rotella® T6 Full Synthetic Heavy Duty Engine Oil features an advanced multi-functional, low-ash additive technology in a synthetic base oil designed to provide highly responsive protection that continuously adapts to your driving conditions
well slap my forehead. Turns out even walmarts synthetic is full synthetic too.
Quote:
Super Tech Full Synthetic 5W30 Motor Oil, 5 qt:
  • Premium formulation utilizing 100 percent synthetic base oils and a high performance additive system
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Old 02-21-2015, 10:59 PM   #13
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Read again. It says full synthetic base oils. Base means that is what they start with. Mobil one is full synthetic.
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Old 02-22-2015, 12:49 AM   #14
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Synthetic has some benefits in certain applications for better MPG, too but likely not something that we would notice.
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