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  #1 (permalink)  
Old 14 Feb 2016, 02:36 pm
Cool Cruiser
Join Date: Sep 2006
Posts: 349
Default oil question

does synthetic oil coke as easily as conventional oil
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Old 14 Feb 2016, 03:15 pm
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Join Date: Sep 2001
Posts: 27,755
Default Re: oil question

In a word: NO, and highly suggested that only synthetic is used on a turbo engine because of that particular property.
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Old 14 Feb 2016, 03:25 pm
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Default Re: oil question

Originally Posted by 4SPEED View Post
does synthetic oil coke as easily as conventional oil
It depends on the oil, what it's used in and now long between oil changes.

Mobile 1 and several other popular synthetic oils are polyalphaolefin (PAO) based. These oils are made by a chemical reaction with a gas like ethylene. So the majority of the molecules in the oil are the same thing or a limited mixture of the same thing. In contrast, regular motor oil is made from a base produced by simple fractal distillation of cruel oil. Basically, the cruel oil is boiled. And whatever comes out between a specific range of temperatures become the base. Both PAO and regular motor oils are given additional treatments and additives so they have the desired qualities. But in the end, PAO is mainly one thing. And the regular oil is a mixture of many different things that vary depending on the crude oil used in that specific batch.

One of the main reasons oil "cakes" is because of thermal breakdown. Heat causes some of the oil to become a solid. Much of this is just carbon. Since regular oil is a mixture of many things, some of those things are more prone to thermal breakdown even though the oil (as a whole) may be rated for that temperature. The result is that some of the oil mixture will turn to solids while most does not. But since PAO is mostly one thing, the vast majority of it can withstand the temperature rating of the overall product. Thus, less breakdown and less caking when exposed to heat that is closer to the oil's temperature rating.

Additionally, detergent additives can mitigate caking as well. This is the way diesel truck oils like Rotella and Delo 400 handle this with high detergent concentrations. And any motor oil can collect solids if not changed regularly per the needs of the engine and the oil itself.

All this said, using synthetic oil in turbo PT's is a good idea since the oil runs though the turbo which can be hot and can increase thermal breakdown. But in non-turbo PT's, there's not much advantage to running a PAO oil instead of a high-quality regular oil.

Beyond these very important considerations, the rest is just a matter of preference.

Last edited by Handy_Cruiser; 14 Feb 2016 at 03:39 pm.
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Old 14 Feb 2016, 04:15 pm
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Default Re: oil question

Originally Posted by 4SPEED View Post
does synthetic oil coke as easily as conventional oil

Basically no but there are exceptions.

The most qualified person to talk to about these kind of oil question is Gold2006 a member on this forum .

Or you can go to the internet and read/learn about it
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Old 17 Feb 2016, 11:11 am
Cool Cruiser
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Location: Deland, fl
Posts: 334
Default Re: oil question

Hello 4speed,

I imagine your interest is in regard to your 2003 GT. From the AMSOIL site:
"2003 CHRYSLER PT CRUISER 2.4L 4-cyl Engine Code [G] Turbo
This vehicle is equipped with a turbocharger. Turbos create severe service conditions by dramatically increasing temperatures. AMSOIL synthetic motor oils provide excellent protection for turbocharged vehicles.
When using AMSOIL Signature Series Synthetic Motor Oil, do not exceed the severe-service drain interval of 15,000 miles, 700 hours or one year, whichever comes first.
Engine Oil
Grade 1......API*
Maximum Performance Signature Series 5W-30 Synthetic Motor Oil (ASLQT)
Performance Plus XL 5W-30 Synthetic Motor Oil (XLFQT)
Performance OE 5W-30 Synthetic Motor Oil (OEFQT) Above 0 F......10W-30
Below 100 F......5W-30 [1]

[1] SAE 5W-30 is preferred.

Oil Filter 25,000-Mile Ea Oil Filter (EAO34)
Oil Filter WIX 51516 Oil Filter"

Your owners manual recommends oil and filter changes every 5,000 miles up to 6 months and the oil meet Chrysler MS-6395. That should be followed unless the oil manufacturer recommends/warranties longer change intervals for your application.

You can do additional oil comparisons to determine the best for your turbo. Look for lowest NOAK volatility, highest flash and fire point temperatures, and TEOST results. You can find some comparison and explanation of these properties and how several 5w-30 oils compare at

Last edited by Gold2006; 17 Feb 2016 at 11:44 am.
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