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Mixing-Blending oil types

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javiercarrascob

Joined: 06 Sep 2009
Posts: 62
Location: Virginia

Posted: Wed Jul 27, 2011 6:44 pm Post subject: Mixing-Blending oil types

Hello Gang,



Hope you are enjoying EAA week, I'm currently using Aeroshell 100W. for my M-14p powered Yak-55m.



As you may know when you do cross country in a '55 there is not much room to bring oil with you.



I find my self landing at FBOs that don't carry either Aeroshell 100W or 120w in summer (80w in winter). Not to mention Phillips 25w-60 is even harder to find (hence I use 100W).



So 



Question 1: Can I mix/Blend Aeroshell 100w with 100? I understand that one is ashless dispersant and the other one is straigh mineral (no aditives)?



Question 2 : Can I mix 100w with 80w when it starts to get cold?



Question 3: Can I mix Aeroshell 100w with Phillips 25w-60?



Thanks, Javier

N5245H

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MONTY(at)bpaengines.com
Guest

Posted: Mon Aug 01, 2011 8:54 am Post subject: Mixing-Blending oil types

You can mix AS 100W with AS 80W or either with AS xxx M.  You are

correct.  Asxxx W is ashless despersant oil and xxx M is straight

mineral oil without the additives that make it xxx W.  What you should

not  do is mix synthetic oils with petroleum based oils.



AS 100 W is good oil in my books.  That's what we use in our M14 test

cell from the git-go.  Never had a problem.  Failure of rings to seat is

usually not a problem caused by oil.  It is operator error as a general

rule, can be unclean at assembly.  It is impossible to get cylinders (

or anything else ) too clean.  If I could sterilize them I would.



Monty Barrett

BPE, Inc.



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