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This guy claims a heavier oil will cause more wear #5280066 11/28/19 10:57 PM
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Whammo Online Content OP
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Fast forward to the 3 minute mark: https://www.youtube.com/watch?v=jLlM0K0Tr8o

Re: This guy claims a heavier oil will cause more wear [Re: Whammo] #5280073 11/28/19 11:27 PM
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Marco620 Offline
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Thin to flow and thick to protect. Slightly higher hths/VI is good but not a catch all. Buy good oil and change it regularly. Buy better oil for severe applications and change it extra regularly.


15' Civic 1.8 i-vtec 294000 mi QSUD 0w20 & LG Biotech, BP CVT Fluid,GUMOUT W/ PEA
Doberman Whisperer!
Doberman,SIG SAUER & SONY Aficionado

Re: This guy claims a heavier oil will cause more wear [Re: Whammo] #5280075 11/28/19 11:34 PM
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Matt1980 Offline
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Originally Posted by Whammo
Fast forward to the 3 minute mark: https://www.youtube.com/watch?v=jLlM0K0Tr8o


Well, in his defense, he did say "In this case" and "can" not will. He's basically saying using a heavier oil than what the manufacturer recommends can cause more wear to the over head cams if the oil is not flowing efficiently. One can disagree, but I don't think that is controversial statement.

Re: This guy claims a heavier oil will cause more wear [Re: Whammo] #5280078 11/28/19 11:39 PM
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Doublehaul Offline
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He is correct about 99% of the time...I enjoy his videos. Keep in mind he’s talking to the layman...and in that regard following the manufactures recommendation is never a bad idea


2019 Toyota 4Runner 4x4 TRD
2019 Toyota Tacoma 4x4 TRD*

Mobil 1 0w40


The specs on the back are more important than the label on the front
Re: This guy claims a heavier oil will cause more wear [Re: Whammo] #5280087 11/29/19 12:12 AM
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motor_oil_madman Offline
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well putting 20w50 in an engine residing in Michigan that calls for 5w30 probably isn't going to do much good, but putting 20w50 in an engine that runs around in the Mohave desert probably would benefit.


2007.5 dodge cummins 6.7 liter. Chevron Delo400 15w40. 7000 mile or 250-300hr intervals.

Re: This guy claims a heavier oil will cause more wear [Re: motor_oil_madman] #5280089 11/29/19 12:19 AM
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dave1251 Offline
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No it would provide more viscosity cushion. Which begs the question how hard does a person need to run their engine for it to be a benefit.


make the inside of your engine oil cap white.
don't use.
Re: This guy claims a heavier oil will cause more wear [Re: Whammo] #5280096 11/29/19 12:41 AM
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Mad_Hatter Offline
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Originally Posted by Whammo
Fast forward to the 3 minute mark: https://www.youtube.com/watch?v=jLlM0K0Tr8o

What he actually says is "wear out faster" and while the why's and how's this happens is more nuanced, he's more or less right. (there are extenuating factors to consider like tolerances and temps and how much thicker the oil is blah blah blah)

I give Scotty a lot of crap, like his swaying as if he's drunk, but everything in this vid is solid advice.

Last edited by Mad_Hatter; 11/29/19 12:53 AM.
Re: This guy claims a heavier oil will cause more wear [Re: Whammo] #5280115 11/29/19 03:43 AM
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RDY4WAR Offline
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As much as I can't stand him, he's actually right about that. Higher HTHS (dynamic viscosity) than the bearing clearances call for can slow oil flow through the bearings as well as increase hydrodynamic friction. Less flow + more friction = more heat. The oil temperature delta through the bearings becomes a lot higher. More stress is placed on the oil pump and drive to pump the higher viscosity. The oil filter experiences a higher pressure delta which can reduce filtration efficiency and make bypass events more common. The higher the viscosity, the greater the amount of air that can become entrained in the oil and the longer it takes to release that entrained air. The higher oil pressure caused by the higher viscosity also increases the capacity for entrained air.

The whole "more cushion" thing is a result of mental gymnastics. Imagine a drag car as a metaphor. A set of 10.5" wide tires is providing excellent traction, no spinning at all, and the car is able to launch off the line at full power without problems. Do you think going to a set of 12" wide tires will provide any additional traction? No. It's already not spinning. The wider tires will just add weight and rolling resistance and slow the car down while benefiting absolutely nothing. Same concept.


"He who is without oil, shall throw the first rod." - Compressions 9:1
Re: This guy claims a heavier oil will cause more wear [Re: RDY4WAR] #5280119 11/29/19 04:34 AM
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Mad_Hatter Offline
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Originally Posted by RDY4WAR
As much as I can't stand him, he's actually right about that. Higher HTHS (dynamic viscosity) than the bearing clearances call for can slow oil flow through the bearings as well as increase hydrodynamic friction. Less flow + more friction = more heat. The oil temperature delta through the bearings becomes a lot higher. More stress is placed on the oil pump and drive to pump the higher viscosity. The oil filter experiences a higher pressure delta which can reduce filtration efficiency and make bypass events more common. The higher the viscosity, the greater the amount of air that can become entrained in the oil and the longer it takes to release that entrained air. The higher oil pressure caused by the higher viscosity also increases the capacity for entrained air.

The whole "more cushion" thing is a result of mental gymnastics. Imagine a drag car as a metaphor. A set of 10.5" wide tires is providing excellent traction, no spinning at all, and the car is able to launch off the line at full power without problems. Do you think going to a set of 12" wide tires will provide any additional traction? No. It's already not spinning. The wider tires will just add weight and rolling resistance and slow the car down while benefiting absolutely nothing. Same concept.

Can't running too thick or too thin of an oil in tight clearances effect the ability to maintain a consistent oil film? Maybe I'm wrong on this but I thought I read once that it has to do with the ideal pressure (not sure I'm using the proper term) in those tight clearances, like bearings and ring to liner, to maintain the MOFT. Plus higher temps in those loc's could lead to thermal breakdown of the lube, no?

Re: This guy claims a heavier oil will cause more wear [Re: Whammo] #5280125 11/29/19 04:47 AM
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demarpaint Offline
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Define too thick. Using a 5w30 in an engine calling for 5W20 is not going to cause extra wear. Using a 20W50 in it in the dead of winter could pose a problem, and might increase wear. IIIRC doesn't the Hemi used in the Ram call for 5W20 in some applications, and 0W40 in others? Is the engine calling for 0W40 totally different than the one calling for 5W20?


God Bless Our Troops

Re: This guy claims a heavier oil will cause more wear [Re: demarpaint] #5280143 11/29/19 06:06 AM
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Mad_Hatter Offline
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Originally Posted by demarpaint
Define too thick. Using a 5w30 in an engine calling for 5W20 is not going to cause extra wear. Using a 20W50 in it in the dead of winter could pose a problem, and might increase wear. IIIRC doesn't the Hemi used in the Ram call for 5W20 in some applications, and 0W40 in others? Is the engine calling for 0W40 totally different than the one calling for 5W20?

Define?..dunno if there's a one size fits all rule but we do know oil drag is a "thing", and I suppose the tipping point where the oil is "too thick" and actually causes undesirable effects is gonna vary from one engine to the next wouldn't it? (variables about the engine will dictate "too thick", no?)


Last edited by Mad_Hatter; 11/29/19 06:07 AM.
Re: This guy claims a heavier oil will cause more wear [Re: Mad_Hatter] #5280155 11/29/19 06:29 AM
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demarpaint Offline
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Originally Posted by Mad_Hatter
Originally Posted by demarpaint
Define too thick. Using a 5w30 in an engine calling for 5W20 is not going to cause extra wear. Using a 20W50 in it in the dead of winter could pose a problem, and might increase wear. IIIRC doesn't the Hemi used in the Ram call for 5W20 in some applications, and 0W40 in others? Is the engine calling for 0W40 totally different than the one calling for 5W20?

Define?..dunno if there's a one size fits all rule but we do know oil drag is a "thing", and I suppose the tipping point where the oil is "too thick" and actually causes undesirable effects is gonna vary from one engine to the next wouldn't it? (variables about the engine will dictate "too thick", no?)


I agree, but I don't think going from a 20 grade oil to a 30 grade oil is a tipping point. The Hemi I mentioned is just one example. The Ford Mustang comes to mind as well, when tracking the car comes into play. Now for a commuter 4 cyl eco-box, driven two miles to the train station, moving from a 20 grade to a 50 grade will be another story. Years ago we were given oil choices, pick the grade to match the climate and how the vehicle was used. Many companies moved away from that to a one size fits all mentality, some are now changing that mindset. I think savvy car enthusiasts still realize that one size doesn't fit all, and blanket statements can get you in trouble.


God Bless Our Troops

Re: This guy claims a heavier oil will cause more wear [Re: Whammo] #5280162 11/29/19 06:37 AM
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BigCahuna Offline
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Most owners manuals will show you what oil wt to use, based on the temperature. Even Harley who recommends 20w50 wt for their motors in everyday use, says to use 10w40 when the temps the bike used in is under 40f. Summer in Arizona is gonna be hotter then summer in Maine, so if you use a heavier oil in AZ, you'll be fine.,,,

Re: This guy claims a heavier oil will cause more wear [Re: demarpaint] #5280167 11/29/19 06:40 AM
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Mad_Hatter Offline
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Originally Posted by demarpaint

I agree, but I don't think going from a 20 grade oil to a 30 grade oil is a tipping point.

I agree that you can safely go up or down a grade but I think the question of wear gets murkier when you're talking multiple grades. For some engines I'm sure it's simply not an issue.. but does that mean everyone could/should expect the same "no effect" effect, maybe not.

Last edited by Mad_Hatter; 11/29/19 06:40 AM.
Re: This guy claims a heavier oil will cause more wear [Re: Mad_Hatter] #5280173 11/29/19 06:51 AM
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demarpaint Offline
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Originally Posted by Mad_Hatter
Originally Posted by demarpaint

I agree, but I don't think going from a 20 grade oil to a 30 grade oil is a tipping point.

I agree that you can safely go up or down a grade but I think the question of wear gets murkier when you're talking multiple grades. For some engines I'm sure it's simply not an issue.. but does that mean everyone could/should expect the same "no effect" effect, maybe not.

We're on the same page. Unless I was burning oil at an alarming rate, and exhausted the typical fixes in a bottle associated w/o repairs I see no point in bumping up to a 50 grade oil. But for a video that I get paid per click, why not stir the pot............


God Bless Our Troops

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