Mixing oil

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Mar 13, 2003 | 09:54 AM

treyZ28

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Banned

Joined: Aug 2001

Posts: 3,505

From: looking for a flow bench so Brook and I can race

Mixing oil

stupid question yes-
but my buddy here at school who really knows his **** (9 sec all motor nova anyone

)says that he never has because he has heard they will actually repel each other.
old wives tale or truth we have no clue, couldn't find anything on mobil1.com
now were just trying to find something somewhere to put this myth down

9/10 outa hes right and makes me feel like a dumb *** so i just said "i'll look into it" rather than "sure you can"

Mar 13, 2003 | 10:19 AM

Gripenfelter

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Joined: Jul 1999

Posts: 3,647

From: Winnipeg, Manitoba, Canada

Why would you mix oils???

Mar 13, 2003 | 02:37 PM

treyZ28

Thread Starter

Banned

Joined: Aug 2001

Posts: 3,505

From: looking for a flow bench so Brook and I can race

Quote:

Originally posted by Gripenfelter
Why would you mix oils???

last time i changed my oil i had 2 10-30s and grabbed 3 5-15's on accident. didn't really care, it was like 8* out

Mar 13, 2003 | 03:54 PM

Black bow tie

Registered User

Joined: Dec 2001

Posts: 51

From: Seattle

I wouldn't worry about it, as far as I know (and read) syth's have no problem blending with dino oils. If you really need the last word on oils...go here:

www.bobistheoilguy.com

Mar 13, 2003 | 03:58 PM

Buttercup

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Joined: Jun 1999

Posts: 939

From: Lowcountry

As long as the bottles are marked with the SAE "starburst" for automotive oil use you should be able to mix and match any weight, brand, type of oil without problem.

Mar 13, 2003 | 04:05 PM

Z28SORR

Registered User

Joined: Jul 2002

Posts: 3,768

From: Friendswood, TX, USA

Yes it's OK! All you do is loose the properties that make the syn. cost more, thereby wasting money. They do not repel each other.

Mar 13, 2003 | 04:25 PM

hairbear21

Registered User

Joined: Feb 2003

Posts: 569

From: South Dakota

You can mix brands and types, but NEVER EVER mix viscoties. It will work for a while, but you are causing serious harm to the internal components by using different viscosities.

The viscoties are made to reach different levels at operating temps. If you have two different types, ie, 10w30 and 15w40, one starts out as 10 weight (the w is actually for "winter"), and the other starts out as 15 weight. Once at operating temp, one is a 30 weight, and the other is a 40 weight. Just by comparison, you can tell that you have two different weights of oil actually fighting against each other.

Mar 13, 2003 | 04:28 PM

hairbear21

Registered User

Joined: Feb 2003

Posts: 569

From: South Dakota

Another bit of advise is that if you ever buy a car from anyone and they freely mention that they run different viscosities of oils, I hope that you are buying that car with the sole purpose to rebuild it.

Mar 13, 2003 | 04:38 PM

joeSS97

Registered User

Joined: Jun 2001

Posts: 1,781

From: Detroit area

Mixing different viscosities will do no harm.Say you mix a 5w 40 and a 10w 40,what you have is 7.5w 40.Also.I am pretty sure the W stands for weight.

Last edited by joeSS97; Mar 13, 2003 at 04:43 PM.

Mar 13, 2003 | 04:54 PM

#10

Black bow tie

Registered User

Joined: Dec 2001

Posts: 51

From: Seattle

How did you come to the notion that mixing oils has any negative effect? Personal testing experience or hearsay? I have spent a fair amount of time on the before mentioned oil site and have read nothing that supports your statements.