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Rotella T4 15W40 + T6 5W40 = "T5 10W40"? #4690725
03/10/18 06:17 PM
03/10/18 06:17 PM
Joined: Aug 2008
Posts: 3,459
Where the wind comes sweepin'
Reddy45 Offline OP
Reddy45  Offline OP

Joined: Aug 2008
Posts: 3,459
Where the wind comes sweepin'
I have some odds and ends of these oils sitting around and thought about mixing them up in a roughly 50/50 mix.

The T6 5W40 is known to shear really quick in my bike, whereas the T4 15W40 remains quite stable for a reasonable OCI.

I know these can mix no problem, but would the resulting viscosity be 10W40?

Re: Rotella T4 15W40 + T6 5W40 = "T5 10W40"? [Re: Reddy45] #4690731
03/10/18 06:21 PM
03/10/18 06:21 PM
Joined: Mar 2018
Posts: 3
New England
PaulManDude Offline
PaulManDude  Offline

Joined: Mar 2018
Posts: 3
New England
Lol I literally just started a thread about the same thing in autos a few seconds ago. I think the 15 weight stays 15 and doesnt get “watered down” to 10. At operating temp I believe it will stay a 40 weight. Not sure why syn would sheer down quicker


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Re: Rotella T4 15W40 + T6 5W40 = "T5 10W40"? [Re: Reddy45] #4690740
03/10/18 06:32 PM
03/10/18 06:32 PM
Joined: Oct 2004
Posts: 3,272
Midwest, Illinois
beanoil Offline
beanoil  Offline

Joined: Oct 2004
Posts: 3,272
Midwest, Illinois
The Widman viscosity calculator is your friend.
Hit the Shell site for PDS sheets with viscosity specs, plug them into the calculator, and see where you will actually wind up.
Calculator


beanoil: Tough under heat, real dirty afterwards.
Re: Rotella T4 15W40 + T6 5W40 = "T5 10W40"? [Re: beanoil] #4690776
03/10/18 07:27 PM
03/10/18 07:27 PM
Joined: Aug 2008
Posts: 3,459
Where the wind comes sweepin'
Reddy45 Offline OP
Reddy45  Offline OP

Joined: Aug 2008
Posts: 3,459
Where the wind comes sweepin'
Originally Posted By: beanoil
The Widman viscosity calculator is your friend.
Hit the Shell site for PDS sheets with viscosity specs, plug them into the calculator, and see where you will actually wind up.
Calculator


Very handy tool! The resulting cST @ 100C would be 14.52 so still a 40wt

Re: Rotella T4 15W40 + T6 5W40 = "T5 10W40"? [Re: Reddy45] #4690847
03/10/18 08:50 PM
03/10/18 08:50 PM
Joined: Aug 2005
Posts: 7,264
Leamington, ON, Canada ..... r...
Papa Bear Offline
Papa Bear  Offline

Joined: Aug 2005
Posts: 7,264
Leamington, ON, Canada ..... r...
Are you looking for a JASO MA/MB (shared sump) mix??


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Re: Rotella T4 15W40 + T6 5W40 = "T5 10W40"? [Re: Reddy45] #4693612
03/13/18 04:04 PM
03/13/18 04:04 PM
Joined: Jan 2018
Posts: 183
Central Texas
Brian553 Offline
Brian553  Offline

Joined: Jan 2018
Posts: 183
Central Texas







This makes a key assumption to me though. The main one being: does the mixing calculation apply for multigrade oils, or just monogrades? Dunno. The mixture looks good, but a good question is: what is your personal minimum riding temperature?

Re: Rotella T4 15W40 + T6 5W40 = "T5 10W40"? [Re: Brian553] #4693664
03/13/18 04:57 PM
03/13/18 04:57 PM
Joined: Nov 2017
Posts: 323
California
CleverUserName Offline
CleverUserName  Offline

Joined: Nov 2017
Posts: 323
California
Originally Posted By: Brian553

This makes a key assumption to me though. The main one being: does the mixing calculation apply for multigrade oils, or just monogrades? Dunno. The mixture looks good, but a good question is: what is your personal minimum riding temperature?


I just did an experiment with mixing multigrades oils of the same formulation, and I can say that the Widman Calculator is very close to what viscosity was measured @ 40c & 100c by OAI.

https://www.bobistheoilguy.com/forums/ub...tra#Post4688436

Last edited by CleverUserName; 03/13/18 05:01 PM.
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