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Old 02-22-2015, 07:37 AM   #15
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I have never seen a vehicle manufacturer's manual that had different change intervals for synthetic and regular.
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Old 02-22-2015, 09:12 AM   #16
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Quote:
Originally Posted by Grey Ghost I View Post
Read again. It says full synthetic base oils. Base means that is what they start with. Mobil one is full synthetic.
huh, well what do you suppose Mobil means by this?

Quote:
Synthetic oil vs. conventional oil

Most readers know that synthetic motor oils typically perform better than conventional motor oils in providing protection for your vehicle, but they might know why. What’s the real difference between synthetic and conventional oil? Pretty much everything.


Conventional and synthetic oils begin in the ground. But that’s where the similarities end.

Synthetic oil is not only refined but also distilled, purified and broken down into its basic molecules. This process not only removes more impurities from the crude oil but also enables individual molecules in the oil to be tailored to the demands of modern engines. These customized molecules provide higher levels of protection and performance than conventional oils. But the synthetic base oil is only half the story. The correct blend additives must go into the mix to create the oil.


Our Mobil 1™ brand of advanced full synthetic motor oils has a unique, balanced formulation to keep your engine running like new. So what are the benefits of Mobil 1 synthetic oil? Synthetics typically outperform conventional motor oils in providing more protection for your vehicle.
https://mobiloil.com/en/article/car-...nventional-oil


Ohhhh the humanity, we have all been bamboozled...
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Old 02-22-2015, 09:29 AM   #17
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Originally Posted by poncho62 View Post
My dad told me something.....Oil doesn't wear out, it gets dirty.......Synthetic oil is going to get just as dirty as conventional.
This is the correct answer.
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Old 02-22-2015, 09:41 AM   #18
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Check the engine owner's manual for how often to change the oil. My manual says one year or 20,000 miles...which ever comes first.
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Old 02-23-2015, 09:50 AM   #19
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Two comments helped me decide what to do, first the Oil filter only can perform so long. Second the oil gets dirty on a gasser faster that diesel engine. Ended up use high end regular blend oil!


Thank you to everyone that replied.
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Old 02-23-2015, 10:36 AM   #20
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Engine oil

My 2009 Ram 3500 DW has 35000 miles on it...It has the 6.7 Cummins engine I change oil and filter every 5000 miles with mobil1 turbo diesel 5w40 truck oil and cummins filter...I'm sure some of you may think I'm throwing a $150.00 away by doing this so often but I want to get 300,000 miles out of this engine...I also change fuel filter every 10,000 miles...Back to oil changes I get the oil changed drive the truck 5 miles check the oil and it is black and no longer transparent...I live in a cold climate and in subzero temperatures the truck starts on cold morning as if were July and 90 degrees...I contribute this to the Mobil 1...
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Old 02-23-2015, 04:35 PM   #21
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Originally Posted by suiteowner View Post
...I live in a cold climate and in subzero temperatures the truck starts on cold morning as if were July and 90 degrees...I contribute this to the Mobil 1...
Doesn't Dodge/Cummins put an engine preheater on it? Nearly all MHs have them.
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Old 02-28-2015, 10:48 PM   #22
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Doesn't Dodge/Cummins put an engine preheater on it? Nearly all MHs have them.
Yes, it is built into the lift pump, which is located on the lower rear-port side of the engine.
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Old 03-01-2015, 06:28 AM   #23
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Do your own test. Change the oil to Mobil 1 or Rotella T6. Every 3K send a sample to Blackstone. Run it until the analysis recommends a change. Then you will know for sure what is best for your engine. My guess is that you will be good until close to 10K.

Get your test kits here:
http://www.blackstone-labs.com/
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Old 03-01-2015, 06:45 AM   #24
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Originally Posted by suiteowner View Post
My 2009 Ram 3500 DW has 35000 miles on it...It has the 6.7 Cummins engine I change oil and filter every 5000 miles with mobil1 turbo diesel 5w40 truck oil and cummins filter...I'm sure some of you may think I'm throwing a $150.00 away by doing this so often but I want to get 300,000 miles out of this engine...I also change fuel filter every 10,000 miles...Back to oil changes I get the oil changed drive the truck 5 miles check the oil and it is black and no longer transparent...I live in a cold climate and in subzero temperatures the truck starts on cold morning as if were July and 90 degrees...I contribute this to the Mobil 1...
FWIW I have a 98 Dodge w/Cummins & it has 232,000 mi & all I use is dino oil,it still runs great,doesn't use much beyween changes & still gets over 20 mpg on the road (empty) & around 13 towing 16,000.
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Old 03-09-2015, 07:57 PM   #25
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There has got to be something different in syn / dino oils... I have been seeing lots of new autos and motorcycles delivered with Synthetic and the manufacturer specifies Synthetic oils ONLY...
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Old 03-10-2015, 09:45 AM   #26
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Quote:
Originally Posted by suiteowner View Post
My 2009 Ram 3500 DW has 35000 miles on it...It has the 6.7 Cummins engine I change oil and filter every 5000 miles with mobil1 turbo diesel 5w40 truck oil and cummins filter...I'm sure some of you may think I'm throwing a $150.00 away by doing this so often but I want to get 300,000 miles out of this engine...I also change fuel filter every 10,000 miles...Back to oil changes I get the oil changed drive the truck 5 miles check the oil and it is black and no longer transparent...I live in a cold climate and in subzero temperatures the truck starts on cold morning as if were July and 90 degrees...I contribute this to the Mobil 1...
Isn't Mobil1 for gas engines and Mobil Delvac for diesel engines?
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Old 03-10-2015, 09:46 AM   #27
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There has got to be something different in syn / dino oils... I have been seeing lots of new autos and motorcycles delivered with Synthetic and the manufacturer specifies Synthetic oils ONLY...
Yes there is something different with new engines coming with synthetic oil "marketing". Notice the oil change interval remains the same.
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Old 03-11-2015, 07:33 AM   #28
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Originally Posted by Ray,IN View Post
Yes there is something different with new engines coming with synthetic oil "marketing". Notice the oil change interval remains the same.

Not all, in fact I don't recall hearing of any, my own use an on board oil analysis system that tells you when to change the oil, that could be 5,000 miles, it might be 10,000 miles.

They've been that way nearly 20 years since the system first came out. And yes, they run full synthetic only.
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