This video FINALLY got me to grasp the concept. I too was confused with the fact my oil was much thinner when draining at normal temp. Which didn't comply with explanations I'd read before.

@TheRepairSpecialist

Жыл бұрын

Thank you for your feedback. I really appreciate it. Craig

Thanks very much for your clear and concise videos & explanations. As a DIY mechanic (or as my wife said(accidental youtube mechanic) i enjoy and learn here, kind regards, Neil

What a creative content you represent Your videos always are informative and I keep learning from them This topic is very complicated when you try to explain the relationship between viscosity and temperature and how oil behaves in such way respoding to temperature fluctuating Because the left number before the W represnts the dynamic viscosity and the right number represnts the kinematic viscosity It’s all about viscosity improvers as you mentioned in your previous videos Thank you for such videos Keep them coming

Useful information well explained! Thank You!

This video is under rated and viewed

Thanks for explaining that, I always knew that the w stood for winter but didn't have a form grasp on what it all meant. Now I do!

Thanks Craig, always great videos.

@TheRepairSpecialist

3 жыл бұрын

Thank you so much for the nice feedback. I really appreciate it. Craig

finally starting to make some sort of sense. thanks!

Absolutely perfect explanation to satisfy the "Hmmmm" in my head, thank you!

@TheRepairSpecialist

Жыл бұрын

Awesome feedback, thank you. Craig

Maybe a video on the differences between diesel and gas driven motor oils. Great video

Thank you for the clear and concise definitions! A quick question: at what temperature is the Winter weight oil viscosity measured? 0 C?? Just curious and Thanks Again!

i always wondered this. thanks for explaining

@skankytrick

2 жыл бұрын

Yes, but I'm dubious you understand even now. See my reply to a lengthy comment above. The only way to understand this issue from this video is by first accepting certain facts cannot be understood and abandoning common sense and the meaning of mundane terminology (i.e., "thick" and "thin").

And I also would like to thank you personally for this video because I FINALLY got it 🤝🤝

@TheRepairSpecialist

Жыл бұрын

Thank you for your nice feedback. Craig 👍

So is a "cold" 5 the same viscosity as a "hot" 30? Meaning basically no change at all?

I was looking for something to show how to adjust in summer.

how about living in a tropical climate with an average temperature of 28 - 34 degrees Celsius? according to the vehicle manual I must use oil with a rating of 10w30? do i need to increase the SAE rating to 10w40 or 20w40? I have driven the vehicle about 160,000 km

Thanks, this is the best explanation of this I’ve found. One more question please, as when it is poured from the bottle new it acts like a cold 5, it appears to the eye that a cold 5 is thicker than a hot 30. How does this cold 5 meet our needs to get to the top of the engine immediately on start up (thick) AND though thinner when hot (like a hot 30) meets our needs and not get flung off the rotating parts and vapourised when hot and a operating RPM? Thank you

@skankytrick

2 жыл бұрын

Yeah, I agree. I don't understand how in reality a 5w-30 is thick when cold and thin when hot, yet the numbers indicate the oil is "mysteriously" much THICKER when hot. So I'm just using different words to say what you're saying. If it is officially much thicker when hot, how can that be, considering in reality that oil is thick out of the bottle but flows almost like water when fully hot. Doesn't make sense to me either. The only way it makes sense would be to redefine the words "thick" and "thin," as obviously oil is much thinner when hot, despite the numbers saying it is much thicker. I suppose the secret lies in the phrase "behaves like"/"acts like." I don't care about arcane meanings to common words, I can clearly see and feel that hot oil is much thinner at high temperatures, even though the scientists say it is much thicker when hot. Scientists also rely on concepts like infinity and imaginary numbers, so who knows what to believe, lol. If you have any more insight since you wrote your comment, please share. This quandary really has me vexed, lol.

@GarthThomson

2 жыл бұрын

@@skankytrick your candor is refreshing! Best I can get MY head around it is that when cold, the 5w comes out of the can as we see it (moderately thin) and as it heats up the OIL in the product becomes more runny (thinner) but the additives start to thicken up the overall ‘product’ until it gets to operating temperature where it is the same viscosity as a 30 weight oil (but a hot 30 weight oil not a cold one that we may imagine pouring from a can which would be quite thick). The kicker is a HOT 30 weight oil is actually thinner than a cold 5 weight! So, though the product is actually thinner hot than cold it is actually thicker than it would have been without the additives. Make sense? I hope you agree!

1. Pls clear what these number here, 5 & 30 denotes? Are these viscosity means 5 centistokes or they indicate another value of viscosity? 2. Does cold 5 and hot 30 have the same viscosity? 3. What main chemicals and additives are added in the mutli grade oil in order for them to work like this?

Hi am bolt driver we working in Nigeria.i drive a 2005 camry 2.4L . The hot weather can be as hi 40 degrees Celsius. I use mobil 1 5w 30 . Is it okay or i should switch. Though the manual specifies 5w30 only

Good video! Here are 2 examples of full synthetic oils of 5w-20: 1) "Known brand" which has cSt of 8.8 at 100°C and 2) "Also known brand" but has cSt of 8.2 at 100°C. Which one would be considered a bit thicker?

@LOREGUINNESS

2 жыл бұрын

I think the first oil woul be considered more thicker at higher temperature. Anyone agree with that?

I still like the old saying “Any oil is better than no oil”! 😂

@TheRepairSpecialist

Жыл бұрын

Very true 👍

Is there a difference between for example 0w-40 and 5w-40 at operating temperature. Does the first number influence the second number? I don't understand why you would use 5w-30 when you can use 0w-40, on paper the 0w-40 will be better in every instance

@LOREGUINNESS

2 жыл бұрын

I think there is. If not, all car manufactures woul recommend high SAE gap engine oils.

@Connor4x4

2 жыл бұрын

0w40 is superior in alot of situations. Even a 5w40.

Did I get it right? Viscosity acts as '5 when cold' and '30 when hot' because the viscosity classification relates to the same standard temperature for comparisons between classes. Adding to that, the fact that viscosity changes with temperature variations allows us to draw a viscosity curve for all viscosity classifications. In other words, this means that multigrade oils have this special property: when the engine is cold, the oil is on the 5 viscosity curve, acting like a '5', and when it is hot, it's on the 30 viscosity classification curve, acting like a '30'.

Super!

@TheRepairSpecialist

3 жыл бұрын

Thank you so much for the nice feedback. I really appreciate it. Craig

I live in +9°c and i use 15w40 is it okay?

Please tell me something.... The recommended oil for my 100 cc air cooled motorcycle is 10w30... But can I used 20w50 during hot season I live in a place with 4 seasons

@TheRepairSpecialist

3 жыл бұрын

Personally i would stick to manufactures recommendation because its so easy to cause accidental damage to engines, sorry i couldn't help further - Craig

great video sir!! in my country, weather temperature goes from 15C to 40C (c=celsius) so what is the oil grade instructions in that case? tks

@EssentialComment

3 жыл бұрын

look in the owners manual, there are too many variables for an outsider to give you exact advice on what oil to use.

@LeonardoCostaUSA

3 жыл бұрын

@@EssentialComment owners manual is useless on that matter

@EssentialComment

3 жыл бұрын

@@LeonardoCostaUSA no probs so then include the details of , vehicle type, make and year, engine type and size, mileage. I run a D4D 2012 hilux, recommended oil is 15/40 however I have run Penrite HPR Diesel 20/60 since the first service at 10000, It has now done 350000 (klms) and starts and runs like new, I have a similar climate to you except it gets colder 0 - 44c,

@LeonardoCostaUSA

3 жыл бұрын

@@EssentialComment my car is 2014 BMW X5 V8 twin turbo 40K miles. Thanks

@EssentialComment

3 жыл бұрын

@@LeonardoCostaUSA wow that sounds like fun. I would use a Penrite HPR 10-50 Full Synthetic, Product code is HPR10010, It even has a BMW spec code on the label. I use it on a few different cars. No i do not work for Penrite.

My motorbike have an viscosity of 20w50. Is it possible to use 5w50 or 10w50 without any issues.

@allenperera6158

Жыл бұрын

yes , u can.

I didn't know it was controversial, why is that and what about it is? in the beginning you mentioned it... can you elaborate on it more?

Can someone tell me, without ac on my idle running engine temperature is around 93 to 97 celcius in aisi wagonr. My car is running on natural gas(cng). Should i do with 20w50 or 5w30? I live in India, here environment temp range from 4 to 50 celcius.

@Connor4x4

2 жыл бұрын

Yes. A 20w50 would be an excellent choice in your climate.

@neildean7515

11 ай бұрын

I was recently thinking the same. My car takes 5W-30, but, i live in Spain where air Temperature gets up to 40oC!!!! But, my instincts tell me to stick to car oil Spec in the manual

Ok I understand the principals. But I pump oil for a living and 15/40 as well as 85/140 are much more thin at 70-100 degrees than at 45-10degrees. If 15w-40 means is should be thinner at cold temps. What am I missing. I’m sitting here waiting forever to drain this oil because it’s cold…

@TheRepairSpecialist

Жыл бұрын

Please notice, and read the pinned comment before commenting again. Thank you!

This makes more sense but makes the concept of viscosity more complicated.

@TheRepairSpecialist

Жыл бұрын

Ok, thank you for your contribution 👍

but how could cold 5 and hot 30 be same???? viscosity isnt dependant on temperature is it

then why is a rod knock much louder at operating temperature than at start up, if viscosity improves with heat the oil should fill the gap between the bearing and the crank better

@LeeTanczos

Жыл бұрын

because when cold the oil is more viscous and so in that way lubricates more strongly. but when it gets up to working temp, the oil is thinner and so yes flows to all engine parts properly as desired but actually doesn't provide as strong a lubricating effect*. What we need is the balance of good lubrication (high film strength from high viscosity) vs. ability of the lubrication to be delivered to the right places (high flowability of the oil due to low viscosity) As you can see, this means you need to take care with saying "viscosity improves" - better to say increases or decreases. *chemical additives start working at higher temps though to offset the basic viscosity effects and the "additive package" can be dominant improver of the oil overall.

but...............HOW? thanks

Sadly, this information is completely incorrect. Look at the SAE, API and, ASTM related testing and documents

@joemgj

Жыл бұрын

Yep, this is very far off. Cold rating is a ansolute viscosity, warm rating is a kinematic viscosity rating. They are measured by two different methods.

VERY CONFUSING VIDEO !

u didnt explain HOW heat increases it, u just explained that heat increases it -_-

I actually don't like this video. It needs to show how the 5w-30 actually behaves in the cold as opposed when it's hot. It can get too cold for even a 0w-20 to be viscous enough to pump through the engine at startup.