what oil gives the best coating at long time intervals?

JHZR2

Staff member
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New Jersey
Hi, I am curious, what oil maintains the best and thickest coating on metal parts, especially contacting parts at long time periods? I have three thoughts: 1) A heavy dino oil, due to its inherently poorer flowability characteristics, as compared to synth oils would be best. Particularly an oil such as a 20w-50 which is quite heavy and would be relatively resistant to flow. 2) Any synthetic oil (heavier would still be better). As I understand it, synth oils tend to have a slight charge on the molecular endgroups, causing the oil to act like a large-scale surfactant, electrically attracting itself to the oppositely charged metallic engine surfaces. Since there is a layer of oil that is 'stuck' to the metallic surfaces, any synthetic, even a very light one, would easily build up a good hydrodynamic boundary because of the remaining oil. 3) The oil (synth or dino) with the best extreme pressure package, because no oil is going to coat beyond more than a few molecules thick if the engine has been sitting for a week or more. Opinions? connents? Thanks JMH
 

Patman

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Oakville, Ontario
For one, you want to choose an oil with moly in it, as the moly will coat the metal parts and leave a protective layer behind, so it's beneficial for infrequently driven cars.
 

Al

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Elizabethtown, Pa
He's the "Administrator" he can just change the numbers [Wink] [Canada] Sorry I hi-jacked the thread. I believe Esters cling to metals better than the PAO's and Dino oils. As was mentioned though the Moly is important as well as the ZDDP [ March 14, 2003, 08:38 PM: Message edited by: Al ]
 
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Dixie
I'd run a synthetic diesel rated oil, something like Delvac 1, 5w-40, Redline 15w-40, or the Amsoil 10w-40. These are formulated with additional rust/corrosion inhibitors. TooSlick
 

MolaKule

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Iowegia - USA
On the molecular level, esters give the best bonding and attraction to metals. On the macroscopic level, there are two additives that can keep the oil on the surfaces: 1. A "clinger" called polyisobutylene (a synthetic hydrocarbon, usually in the form of an olefin copolymer) 2. A surfactant (surface-active-agent) of the alkylamine family of chemicals.
 
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I don't know stuff from Shinola only did chem 101 but from articles I've read pao is a copy of an oil molecule where as esters are something different as far as covalent charge or something.
 
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