REFLECTOR: Lycoming break in oil

[Laurence Coen]

Andy,

I used Phillips 66 X/C 20W-50 in my Cherokee O-360 for 20 years.  After 2236 
hours I rebuilt the engine because of an AD on the oil pump that meant 
cracking the case.  The crank and cam miked out to still meet factory new 
spec.  I'm an Exxon Elite guy now but I don't think you'll go wrong with the 
Phillips.

Larry Coen
N136LC



--------------------------------------------------
From: "Andrew Ellzey" <ajlz72756 at yahoo.com>
Sent: Tuesday, July 08, 2008 10:11 AM
To: "Velocity Aircraft Owners and Builders list" <reflector at tvbf.org>
Subject: REFLECTOR: Lycoming break in oil

> I am considering using Phillips 66 X/C 20W-50 engine oil 
> http://www.phillips66aviation.com/AvLubricants/XC_20W-50.htm for my IO-540 
> 0 SMOH engine. Phillips also makes a type M 20W-50 break in oil 
> http://www.phillips66aviation.com/AvLubricants/Type_M_20W-50.htm. The 
> Phillips 66 X/C 20W-50 literature makes the following claims, X/C 20W-50 
> is the first approved multiviscosity aviation oil for opposed piston 
> engines. It provides better engine performance than any single grade oil 
> in all weather conditions. X/C 20W-50 is formulated with an ashless 
> dispersant package allowing for cleaner engine operation. (((X/C 20W-50 is 
> recommended for break-in))). It provides a cleaner and quicker break-in 
> than traditional all mineral single grade oils. Plus, X/C is an 
> operational oil so there is no need to switch oils after break-in. X/C 
> 20W-50 utilizes all petroleum base oils which provide excellent solvency 
> and is successful in preventing lead and lead salts.
>
> The Phillips 66 M 20W-50 makes these claims, Type M is generally 
> recommended and used as a break-in oil for newly overhauled aircraft 
> engines. Type M is generally used by engine overhaul and repair shops for 
> the initial run-in of aircraft piston engines. Type M 20W-50 is designed 
> for owners and pilots who want the performance of a multi-viscosity, 
> mineral based piston engine aviation oil without dispersant additives. 
> Type M contains the same high quality base oils and viscosity index 
> improvers found in renowned X/C aviation oils.
>
> The only difference that I see is that the M doesn't contain the 
> dispersant additives. Has anyone on the reflector used either of these 
> oils for your break in oil and what were your results? I like the fact 
> that with the X/C 20W-50 I won't need to use two types of oils after the 
> break in.
>
> Andy Ellzey
> XLRG
>
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