ADVrider

Go Back   ADVrider > Gear > The Garage
User Name
Password
Register Inmates Photos Site Rules Search Today's Posts Mark Forums Read

Reply
 
Thread Tools Search this Thread Display Modes
Old 09-14-2014, 04:58 PM   #1
outfit OP
Studly Adventurer
 
outfit's Avatar
 
Joined: Jul 2008
Location: Orkney Isles
Oddometer: 652
Arrrrrrgh. Oil question

On oil table's such as the one below, why does a 20/50 have a higher temp rateing than a 10/50? The two higher number's (50) are the same.
The lower number's seem to follow form, but the higher number's that are the same, seem all at sea
outfit is offline   Reply With Quote
Old 09-14-2014, 05:18 PM   #2
33 1/3
n00b
 
Joined: Sep 2008
Oddometer: 7
Perhaps they are concerned with the lower end of the temperature spectrum. The polymers which make the oil thicker at higher temperatures will shear apart with use. A higher viscosity base oil will not lose viscosity at high temperature to the same degree as the thinner oil. Do you need to worry about it? Probably not.

33 1/3 screwed with this post 09-14-2014 at 05:25 PM
33 1/3 is offline   Reply With Quote
Old 09-14-2014, 05:21 PM   #3
Cogswell
Spudly Adventurer
 
Cogswell's Avatar
 
Joined: Jan 2005
Location: Riding with my pal Richard Cranium
Oddometer: 4,003
I don't ever recall an oil container labeled 10w50 on a shelf in the 35 odd years I have been buying oil.....



Mike
__________________
Cogswell Rides To Big Bend
See my airhead project here
Time Warp Vintage Motorcycle Club
The good thing is, your damn motor can't read. If it says oil on the container, it's pretty much OK to dump in there.... ED.
Cogswell is offline   Reply With Quote
Old 09-14-2014, 06:58 PM   #4
k-moe
Beastly Adventurer
 
Joined: Jun 2012
Oddometer: 2,328
Quote:
Originally Posted by Cogswell View Post
I don't ever recall an oil container labeled 10w50 on a shelf in the 35 odd years I have been buying oil.....



Mike
Really?

__________________
Mixing metaphors is like killing two birds with a dog that won't hunt.
k-moe is offline   Reply With Quote
Old Yesterday, 05:00 AM   #5
BossMaverick
Gnarly Adventurer
 
Joined: Jan 2012
Oddometer: 187


Multi-weight oils start at the lower number. Additives are added to make the oil have properties of a thicker oil at higher temperatures. A 10W50 weight oil is 10 weight oil with a bunch of additives added to make it behave like a 50 weight oil when hot. Since 20W50 starts life as a 20 weight oil, less additives are needed to make it behave like a 50 weight oil when hot. This means that 10W50 weight oil would break down and fall out of a 50 weight range quicker than 20W50 oil.

In addition, there are acceptable ranges of given weights of oil. A 10W50 oil would be on the low side of a 50 weight classification when hot. A 20W50 oil would probably be in the midpoint of a 50 weight classification when hot.

Example to help illustrate what I mean:
Mobil 1 0W40: Viscosity at 100 degrees C is 13.5
Mobil 1 5W40 Diesel: Viscosity at 100 degrees C is 14.5
Mobil 1 10W40: Viscosity at 100 degrees C is 14.7
Mobil Delvac 15W40: Viscosity at 100 degrees C is 15.0
SAE range for 40 weight oil at 100 degrees C: 12.5 to 16.29

As you can see, all of Mobil's 40 multi-weight oils meet the SAE range for 40 weight oil, but they fall in different places within that range.

The SAE viscosity range for 50 weight oil at 100 degrees C is 16.3 to 21.89, which is very wide considering that 30 weight oil is only 9.3 to 12.49. Your bike's manufacturer probably knew this when they wanted the bike to have thick oil which is why they didn't recommend an oil on the low side of the SAE 50 weight range at high temperatures.

At the end of the day, its your bike and you can use whatever you want as oil. Just don't expect warranty coverage if you go outside of the manufacturer's oil specs.

__________________
'09 GSF1250SA Bandit
BossMaverick is online now   Reply With Quote
Old Yesterday, 10:52 AM   #6
vintagespeed
fNg
 
vintagespeed's Avatar
 
Joined: May 2011
Location: Rancho Cucamonger, CA
Oddometer: 1,561
i learned back in those early VW days that running 20w-50 in the winter means i had to push-start the car.
__________________
'12 Triumph ST3R corner raper (sold, sadly), '09 HusaBerg FE570 (also sold) and a bunch of 2 strokes that you dont want to read about. :)

TAT-2013: http://www.advrider.com/forums/showthread.php?t=913898
SoCal_NoDak-2012: http://www.advrider.com/forums/showthread.php?t=829203
vintagespeed is offline   Reply With Quote
Old Yesterday, 02:43 PM   #7
Cogswell
Spudly Adventurer
 
Cogswell's Avatar
 
Joined: Jan 2005
Location: Riding with my pal Richard Cranium
Oddometer: 4,003
Quote:
Originally Posted by k-moe View Post
Really?

Yeah, I don't shop where they sell that fancy oil.



Mike
__________________
Cogswell Rides To Big Bend
See my airhead project here
Time Warp Vintage Motorcycle Club
The good thing is, your damn motor can't read. If it says oil on the container, it's pretty much OK to dump in there.... ED.
Cogswell is offline   Reply With Quote
Old Yesterday, 03:12 PM   #8
outfit OP
Studly Adventurer
 
outfit's Avatar
 
Joined: Jul 2008
Location: Orkney Isles
Oddometer: 652
[QUOTE=BossMaverick;25076544]

Thankyou for the helpfull reply

outfit is offline   Reply With Quote
Old Yesterday, 03:45 PM   #9
k-moe
Beastly Adventurer
 
Joined: Jun 2012
Oddometer: 2,328
Quote:
Originally Posted by Cogswell View Post
Yeah, I don't shop where they sell that fancy oil.



Mike
I just get mine at the local, small town, H-D shop. The shop does sponsor a few racing teams, so that my be why they carry the Motul.
__________________
Mixing metaphors is like killing two birds with a dog that won't hunt.
k-moe is offline   Reply With Quote
Old Today, 06:09 AM   #10
showkey
Beastly Adventurer
 
Joined: Jun 2007
Location: Wausau
Oddometer: 1,759
What is that oil chart for ?

Where 10w-40 only goes to 42 degrees F............HD or other hot running air cooled engine ?????
__________________
1982 CX500 Turbo ,2006 ST1300, 2012 NC700X
1971 CT90,1981 C70, 1986 TRX 250,
1993 TRX300 4X4, 2001 TRX500 4x4, 1987 XR250L
showkey is online now   Reply With Quote
Old Today, 04:00 PM   #11
k-moe
Beastly Adventurer
 
Joined: Jun 2012
Oddometer: 2,328
Quote:
Originally Posted by showkey View Post
What is that oil chart for ?

Where 10w-40 only goes to 42 degrees F............HD or other hot running air cooled engine ?????
It's for oil, and it's somewhat out of date. Dosen't matter what vehicle you run the oil in; all that matters is that you chose the right oil for the service conditions.
__________________
Mixing metaphors is like killing two birds with a dog that won't hunt.
k-moe is offline   Reply With Quote
Old Today, 05:49 PM   #12
Strong Bad
n00balicious
 
Strong Bad's Avatar
 
Joined: Oct 2007
Oddometer: 3,767
Any and all oil questions should go here:

http://www.bobistheoilguy.com/
__________________
"I couldn't wait for success, so I went ahead without it."
Strong Bad is offline   Reply With Quote
Reply

Share

Thread Tools Search this Thread
Search this Thread:

.
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On

Forum Jump


Times are GMT -7.   It's 08:47 PM.


Powered by vBulletin® Version 3.8.5
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Copyright ADVrider 2011-2014