Synthetic oil "clingier"

[LouDawg]

I've read this elsewhere in the past. Does synthetic oil remain on parts longer than conventional oil? Is there somehow more of a protective "film" left on these parts to help prevent startup wear moreso than with conventional?

Or does virtually all of the oil drain off, say, overnight or over a period of several hours?

I guess ultimately, I'm wondering if there is, theoretically and/or potentially more startup protection with synthetic.

(Not trying to fan the flames of the syn vs. conventional argument that rages on ad infinitum...just wondering.)

 

[obbop]

Mighty fine question and I have no data to provide an answer.

However, lack of knowledge never kept the Old Coot from babbling about a topic. One reason Coot considered a political career at one time.

With a feeble attempt at logic........ well..... if the synthetic stuff actually flows better at colder temperatures, if the synthetic stuff is "slipperier.... I suppose one could assume that more synthetic oil would drain to the pan faster than would a non-synthetic.

Is Coot logic sound? Or is Coot merely babbling again and should be sent to the shanty without supper?

 

[SSDude]

Group V oils (esters) will "cling" to parts of your engine.

 

[mechtech2]

No oil drains off in a few hours, or even overnight.
For anywhere near normal operation parameters, it isn't a concern.
When started, the oil pump will help lubricate things, and the almost instantaneous splash will take care of the rest.

 

[Thatwouldbegreat]

Quote:

---

Group V oils (esters) will "cling" to parts of your engine.

---

What SSDude said!

 

[Titan]

My clingier underwear is synthetic.

 

[Tones]

Moly will plate up on engine parts. Look for oils with Moly. It does not seem to be a big advantage, as there are oils without Moly that seem to do just as well as oils with Moly.

 

[cmhj]

I have no proof with 4 cycle engines. However,

In the late 70s thru the late 90s I did a great deal of snowmobile racing. We found that syn oils, upon engine tear downs, left a noticeable film unlike their conventional counterparts.

 

[427Z06]

Quote:

---

I've read this elsewhere in the past. Does synthetic oil remain on parts longer than conventional oil? Is there somehow more of a protective "film" left on these parts to help prevent startup wear moreso than with conventional?

---

I believe the term your looking for is "adhesive" properties.

 

[Mr_Incredible]

If I remember right, the polar properties of synthetic attract it to the metals. This property is valuable during operation since it keeps the film coherant longer under stress. Likewise, at rest it tends to stay in place longer.

At least, that's what I remember.

 

[Thatwouldbegreat]

http://www.hatcocorporation.com/pages/syntheticlubes/aboutesters.htm

Ester Chemistry



Esters have been used successfully in lubrication for more than 50 years and are the preferred stock in many severe applications where their benefits solve problems or bring value. For example, esters have been used exclusively in jet engine lubricants worldwide for over 40 years due to their unique combination of low temperature flowability with clean high temperature operation. Esters are also the preferred stock in the new synthetic refrigeration lubricants used with CFC replacement refrigerants. In automotive applications, the first qualified synthetic crankcase motor oils were based entirely on esters and these products were quite successful when properly formulated.



The polarity of the ester molecules causes them to be attracted to one another and this intermolecular attraction requires more energy (heat) for the esters to transfer from a liquid to a gaseous state. At a given molecular weight or viscosity, the esters will exhibit a lower vapor pressure which translates into a higher flash point and a lower rate of evaporation for the lubricant. In general, the more ester linkages in a specific ester, the higher its flash point and the lower its volatility.



Polarity also causes the ester molecules to be attracted to positively charged metal surfaces. The result is a stronger film which translates into higher lubricity and lower energy consumption in lubricant applications. The polar nature of esters also makes them good solvents and dispersants. This allows the esters cleaner operation and improved additive solubility in the final lubricant.

 

[Bryanccfshr]

Grp I -Fairly Polar
Grp II less polar
Grp III Not polar
Grp IV Not Polar
Grp V ester Very polar

Polarity can be correlated with the ability of the oil to act as a solubility agent. In HCO based lubricant purity makes the oil less polar and less attracted to metal.
Esters can correct this because esters are very polar despite purity.

 

[MKR]

Dino diesel oil seems to be very sticky/clingy compared to any pcmo conventional or synthetic.

 

[LouDawg]

Quote:

---

Quote:

---

I've read this elsewhere in the past. Does synthetic oil remain on parts longer than conventional oil? Is there somehow more of a protective "film" left on these parts to help prevent startup wear moreso than with conventional?

---

I believe the term your looking for is "adhesive" properties.

---

Thank you. I hesitated to use the term "adhesive" as it relates to pcmo. Conjures up all sorts of nasty images of glues, epoxies, and the like gumming up the inside of your crankcase.

 

[Blue99]

In addition to "cling", esters, with their polar nature, will also exhibit "creep".

I routinely open up new, 16 oz. bottles of Mobil MX2T ester based 2 cycle oil, & carefully pour out a 3 oz. portion to mix 2 cycle gas at approx 42 to 1.

A couple of days will go by & the outside of the bottle is "slimey" as the ester base oil will migrate out thru the capped bottle top & coat the exterior portions of the bottle.

 

[LouDawg]

Quote:

---

In addition to "cling", esters, with their polar nature, will also exhibit "creep".

I routinely open up new, 16 oz. bottles of Mobil MX2T ester based 2 cycle oil, & carefully pour out a 3 oz. portion to mix 2 cycle gas at approx 42 to 1.

A couple of days will go by & the outside of the bottle is "slimey" as the ester base oil will migrate out thru the capped bottle top & coat the exterior portions of the bottle.

---

Nah...you're just messy.

 

[wileyE]

Since most the "synthetic" sold is group3 and group4. I'd say the polar arguement doesn't hold much oil if you generalize the question to syn vs min?

Since most the conventional oil sold has group 2, or even some 1 in it, the conventional would have to win the polar cling race.