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[Norton AntiSpam] Re: Fw: Oil and Radials

 
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viperdoc(at)mindspring.co
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PostPosted: Thu Jun 24, 2010 5:35 pm    Post subject: [Norton AntiSpam] Re: Fw: Oil and Radials Reply with quote

Eric,
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Doc

From: owner-yak-list-server(at)matronics.com [mailto:owner-yak-list-server(at)matronics.com] On Behalf Of Eric Wobschall
Sent: Wednesday, June 23, 2010 6:27 AM
To: yak-list(at)matronics.com
Subject: [Norton AntiSpam] Re: Fw: Oil and Radials



Doc, I believe the SAE60 part of the range (viscosity at high temps) would make it equal to 120, and low temp viscosity (SAE 25) would make it equivalent to 50 weight oil (very thin). A great thing if it works right, which it seems to.



On Jun 22, 2010, at 10:15 PM, Roger Kemp M.D. wrote:




Walt my mistake. The Phillips site says it is equivalent to 120 ? Not much info on that site.

Doc



From: owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com) [mailto:owner-yak-list-server(at)matronics.com (owner-yak-list-server(at)matronics.com)] On Behalf Of Walter Lannon
Sent: Monday, June 21, 2010 10:38 PM
To: yak-list(at)matronics.com (yak-list(at)matronics.com)
Subject: Re: Fw: Oil and Radials





Doc;


Phillips X/C 25W60 is not semi-synthetic. The only aviation semi-synthetic that I know of is Aeroshell 15W50.





The Precision Engines letter was excellent in that it explained in detail the reason for the caution notes in the P&W SB.


I totally agree that 15W50 and 20W50 should not be used in radial engines (and I would include the smaller ones). 25W60 on the other hand is probably OK for the small radials. It is nominally equivalent to 120 at higher temperatures (60 SAE = 120 SUS) though this is probably degraded by the ashless dispersant and viscosity modifier additives. Maybe the end result puts it closer to 100 SUS ? Don't know for sure but the P&W SB does recommend the use of a higher number with additives.





The only disappointment in the Precision letter was no reference to the performance of 25W60.





Walt


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