What are the main differences between grease and oil? 

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Um, It seems as if you didn't mention the most important variable... the speed of the bearing. The oil or grease needs to "flow" not just to carry heat away, but it also needs to flow Into the bearing quick enough to keep up with what's being pushed out. At higher speed, the grease will not be able to keep up with the rollers and cannot be replaced, unlike the oil which can remain around the rollers. Granted, there is oil in grease, but over time and with heat, that oil separates out. Anyway, just seems like bearing speed is a determinant to thickness ~

A little real world example of the oil flow heat transfer is in rotary engines. Most piston engines do not have dedicated oil cooling unless it is a heavy duty or high performance application. Rotary engines are a little bit of a special breed, though. Only the outer edge of the motor is cooled by the water pumped through it. The whole center core of the motor is only oil cooled. And the oil is forced through it. Using an Mazda RX8 as an example, this oil pull about 1/3 of the overall heat from the motor and dumps it through two massive oil cooling radiators in front of the front wheels. These two cooler are nearly half the size of the water radiator. Not sure if anyone will find that interesting or not, but I figured I would share it as an easy real world example of that part of your video.

Grease is basically oil that has a thickening agent added to it which then makes grease .and as that grease gets older it gradually drys up leaving no oil but only the thickening agent left in the bearings . Hence the need to clean out the bearings and repack with fresh grease💪😎👍

Thanks a lot, i'm going to use that info when greasing my skateboard bearing

An excellent video. It would be helpful to have a comparison video of Ca, Na, Li and Mo based greases. Thank you very much.

Very good explanation. Very good channel for learning about lubrication. Request to make full course on used oil analysis.

Well done, best info and best explanation, keep up the good work 👍🏻

I love your channel, I was thinking I get my answer and I did but I love how I have more questions!

Excellent Voice and a very Good Video

Just repacked my trailer wheel bearings (non-sealed tapered roller) and there's a nagging question I've often wondered. I googled it and could not find an answer. Essentially - I can't help but think that the rollers will just push 99% of the grease out of the way, and the tiny bit of grease film left on the races and rollers should degrade and bearing fail in short time. Obviously that is not what happens... So i guess i am asking how the heck does the grease do its job? does it turn liquid when warm and flow around the bearing, giving it fresh grease constantly? every time i have repacked a bearing i see a big ol blob of brand new grease in the middle doing nothing and then a small amount of dirty used grease around the bearing, so it can't be flowing much... Timkin says pack the hub 1/2 full of grease. Does the centrifugal force cause the grease to flow a bit and push itself into the bearings? So many videos of guys doing it wrong, only packing the bearing and not the hub - will those likely fail prematurely?

Many large equipment have electric motor driven auxiliary oil pumps to circulate lube oil prior to start up. Once the equipment is running the directly driven main oil pump takes over and the aux. Oil pump stops as per instrument and electrical logic diagram.

“G’day everyone”. That’s an instant like for my Aussie brother.

When you have time do a feature on the different types of grease

Using this information for my hair 🤣😊😂🤞🏽. Definitely going back to grease, thank you !

To be quite honest, I have no idea what kind of lubricant to use. For 88mm Bearing Cable Pulley Wheel Aluminum Alloy Gym Equipment, what is advised? I recently acquired some weight lifting equipment, but the factory-installed pulleys were broken, and I didn't feel confident using them, so I ordered some new aluminum pulleys. Any help would be very appreciated as I'd like to keep them maintained so they function without much to no resistance.

Very good

I’ve always used 2oz of transmission fluid in a fresh oil change and a tablespoon of grease in the filter. All my engines have lasted more than 500,000 miles.

Do grease evaporates on the hot weather?? 30C to 40C° Temperature?? Please let me know sir..

Thanks on behalf of my tools

Sir, I have a question. I am new to this topic and i dont really understand why it takes 10-20 seconds for the lubricant to reach bearing

In really dusty environment which lubricating would be better? I mean between oil and grease.

Sir Can u make a vedio how u make the grease

Pl share some videos on grease

Ball and roller bearings are supposed to roll in there races, does the lubricant ever cause them to slide instead of roll? and wouldn't that be a bad thing?

❤

What u mean by leakage in grease ?

how are things going over there? ive read some scary stuff about lockdowns and martial law

👍👍

I got your video proposed and next to it an ad for KFC. Sometimes AI works all too well 😂

' grease is a good to use gearbox but little leak spread outside... oil is a not good in gearbox and can leak spread outside

My thoughts on grease. It can't be cleaned. It causes more friction. It's hard to replace where it is located. And for last just now they are developing "better" greases.

I'm just here to quiet a door hinge

Oil also has lower viscosity than oil. If you have bearings that need to spin faster, you need a lower viscosity lubricant. You can't use grease in these applications. Another important factor is application dependent. On fishing reels for instance, the spool bearings need to have very low friction in order to reduce the drag the bait has to swim against when it's pulling line. Using grease would increase the resistance and cause the bait to not be able to pull out line from the spool properly before it tires out. The lower friction on the spool also makes casting easier and improve the distance on the casting. On fishing reels, the spool bearings are usually lubricated with oil instead of grease to reduce the lubricant drag. In fact, some reels uses a very thin dry film of lubricant to make the spool spin with very little friction. Even oil in these applications would cause too much friction. You will have to lubricate more often over a season, but it improves the performance. There are lots of other examples where one type of lubricant is superior to others.

U sound like Technoblade

Well. Grease is the word, it’s got groove, it’s got meaning. Oil not. Grease is the time, is the place, is the motion. Oil isn’t.

Love your videos for the content. Your visuals/graphics are extremely good but your microphone sucks. You should buy another microphone with all that money you save on single payer healthcare. ('m in USA).