Why do oils get thick when they oxidise? Polymerisation of lubricants explained
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- เผยแพร่เมื่อ 4 มิ.ย. 2024
- When oils oxidize in service, or even in storage, they tend to do two things - discolour and thicken. This increase in viscosity is one of the clearest signs of oil degradation, and when left unchecked causes the application to consume more energy working against fluid friction, as well as result in gum, deposits and varnish.
In this video we explain one of the prime chemical reactions that causes molecular chains to lengthen and therefore viscosity of the lubricant to increase - polymerization. - วิทยาศาสตร์และเทคโนโลยี
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Thank you for that explanation, I kinda had the gist of it, but visualized and explained makes it much clearer for me.
Yeah sometimes a very simple animation helps!
So this is what happens when I season my cast iron pan. Great explanation.
Exactly! Funnily enough I did a demo of this: th-cam.com/video/l7Jb56WCAgo/w-d-xo.html
@@LubricationExplained awesome! I'll give it a watch!
back in the 80's and 90's when i changed the oil the car felt noticeably quicker. but starting in the early 2000's when i changed the oil (mineral) nothing felt different.
Thanks for the explanation , really appreciate it
No worries, glad it was useful!
For several decades, oil viscosity increase has been THE number one focus of engine oil formulators; far more so than things like wear. Each new spec release demanded greater resistance to oxidation & less vis increase over ever longer durations. However, IMO after the big jump from SJ to SL, things started to become a bit silly. Yes SM, SN & SP oils all had better oxidation resistance but this could only by determined by making the test conditions so unrealistically severe, that the results were utterly divorced from any kind of driving reality. Computer CPUs went through the same sort of thing years ago, when they became so blindingly fast, that the so-called 'extra performance' they delivered, effectively meant nothing to the user.
The bottom line is that today's oils are just so good, you shouldn't really be concerned about oxidation & viscosity increase. Chances are that you'll routinely change your oil way before the oil runs out of control.
Yeah at this point it feels like the lubricant performance outstrips the maintenance practices that are applied by most vehicle owners.
This is the largest contributing process that will eventually overcome detergents, antioxidants and dispersants through overextended use regarding (hours/mileage/operating conditions) of an automotive engine oil and filter? During my high school/college mobile oil change service days, I remember seeing oil coming from drain pans that was (almost) the consistency of room temperature gelatin. (Pre-synthetic era)
Generally yes, this is the main reason that oil “gums up”. Additional deposits get generated by spent additives and inconsistent fuel, but oxidation resulting in polymerisation is the main driver.
Hi Maestro, I would like to comment you a real case we detected in a plant that we are trying to solve. We were detectig an increment of the viscosiy in the regular inspection of the oil, with that results the plant decided to change the oil. Now it comes the "phantoms", after changin it and 2-3 months working we did a new analysis and the viscosity was higher than before, much higher. And after 2 months, we did another analysis and it was even higher. Real strange. The thing is TAN is like an horizontal line, no increment no decrement. The other varabiales are all in line. What are we missing here? Watching all your videos to get some ideas
Hello sir! There's a number of things that it could be. If you're able to post the oil analysis results (with any confidential material redacted) - please post your question to the forum: lubrication.expert/forums/ and I'll see if there's anything that I think of which you might have missed.