Synthetic or Mineral oil? - Diesel Truck Forum - TheDieselGarage.com
Thread Details Posted by 747MD11, this thread has received 30 replies and been viewed 11391 times.

View Poll Results: What type of oil and OCI do you use?
Mineral Oil 8 14.04%
Synthetic Oil (normal change interval) 14 24.56%
Synthetic Oil (Extended change interval) 35 61.40%
Voters: 57. This poll is closed

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post #1 of 31 (permalink) Old 12-22-2010, 12:15 AM Thread Starter
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Synthetic or Mineral oil?

There's a lively debate going on at BITOG over whether synthetic has any benefit over mineral oil OTHER than the potential for extended intervals.. I am of the school that says for $30 extra or so, there no cheaper insurance that going with synthetics .. after 1000 miles, I went 100% synthetic in my truck... TranSynd in the Alli.. Schaefer 9000 in the engine, and Royal Purple in the front and rear diff.. Brakes and PS are already synthetic..

Reasons I like synthetic:

-better thermal stability
-better cold starting (flow)
-better oxidation resistance
-better sheer qualities
-longer lasting additive packages in many cases

Anyway, the question is.... do you feel there are any reasons to use synthetics over mineral oils in your diesel trucks?

feel free to discuss.

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post #2 of 31 (permalink) Old 12-22-2010, 12:50 AM
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Not a doubt in my mind that syn isn't the way to go. This being said, i only use it in a handful of my stuff. To switch every thing i own over to syn, would run into some major cash..
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post #3 of 31 (permalink) Old 12-22-2010, 01:19 AM Thread Starter
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Quote:
Originally Posted by navistar45 View Post
Not a doubt in my mind that syn isn't the way to go. This being said, i only use it in a handful of my stuff. To switch every thing i own over to syn, would run into some major cash..
well, yeah, I can imagine if you run a fleet, or maybe own one and there is not financial benefit to synth, that could get expensive. In my case, I own 3 vehicles, and that's not too much cash over a year ... especially since two of the require synth from the factory...

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Video of my truck: Youtube Video

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post #4 of 31 (permalink) Old 12-24-2010, 05:59 AM Thread Starter
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bump

2011 Duramax 2500HD LTZ
100% US Made of mostly US parts with some parts from Germany and Japan.

Video of my truck: Youtube Video

2005 E320 CDI
2008 BMW X5 4.8i
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post #5 of 31 (permalink) Old 12-24-2010, 06:03 PM
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First not ALL Synthetic motor oils are created equal. Some willl say all syn are the same, NOT true. All Brands are chemically diffenent down to the base stock to the additives.

I run AMSOIL in all my vehilces for over 10 years now, and right off from the 1st oil change from new, and do extended oil drain intervals on them all. I have went as high as 27,000 miles in 1 year on my daughters vehicle on 1 oil change commuting back and forth from school. I am on my 3rd Dodge CTD and run Amsoil in all of them with extended drain intervals backed by oil analysis, my 2002 ran a total of 70k and 5 years on the same oil with bypass filtration and all I did was change my filters and top off. Oil was still good when I traded it in.

Why I choose Amsoil is they use the best of additives a PAO synthetic base stock, and a guarentee right on the bottle of 25,000 miles or 1yr drain intervals. No other oil comes close. Others will have a different view but this is mine. I'm happy with my choice, saving $$ in the long run and also the evironmental issue of not using conventional oils. Made in USA.
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post #6 of 31 (permalink) Old 12-24-2010, 06:56 PM Thread Starter
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Yeah, I fully agree they're not all created equal... I also use a PAO based synth (Schaeffer) and I like their additive package, high in boron and a good amount of ZDDP, and most importantly, designed to suspend high amounts of soot (8% saturation point) for diesel engines.

My point in the question however is whether people are using synthetics or mineral oils.. I've seen quite a few duramax (and other diesel) owners swear by 15-40 Rotella and Delvac for example.

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post #7 of 31 (permalink) Old 12-24-2010, 07:21 PM
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Did not mean to get off topic, PAO AMSOIL Synthetic for me.

Last edited by Syn-Herb; 12-24-2010 at 07:23 PM.
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post #8 of 31 (permalink) Old 12-24-2010, 07:23 PM
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I have been running Rotella T syn oil in my 6.0 engine since 15,000 miles. I have over 122,000 miles today. I run it because it makes the engine run quieter and because of the shear factor of the 6.0 engine.
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post #9 of 31 (permalink) Old 12-27-2010, 08:19 PM
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Quote:
Originally Posted by 747MD11 View Post
Yeah, I fully agree they're not all created equal... I also use a PAO based synth (Schaeffer) and I like their additive package,
Actually it's a blend of PAO and hydroc-cracked (group III) (from their website).
However, not a slam - it is a good oil.
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post #10 of 31 (permalink) Old 12-30-2010, 10:34 PM
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One of many reasons which can clearly benefit from the use of synthetic motor oil is the turbocharger. When a turbo charged engine is shut off immediately after a high speed run, "heat soak" occurs from the engine, and it considerably increases the temperature in the turbocharger. Over a period of time this can lead to deposits that can block the oil flow to the turbocharger bearings, leading to turbocharger seizure.
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