REFLECTOR: Engine Oil: Survey

[Lou Stedman]

Up in the cold North East I run Aeroshell 15w50 all year. Lyc IO-360

From: Mark Magee 
Sent: Tuesday, June 12, 2012 5:52 PM
To: Velocity Aircraft Owners and Builders list 
Subject: REFLECTOR: Engine Oil: Survey

All,
The discussions on heat, oil and water spurred me to start this thread and ask if anyone is running anything other than Aeroshell, particularly in a LYC/CONT?
For brevity I'll pose these questions:
1) Lycoming, Contenental, Auto (specify):
2) Aeroshell Only
2A) If additives what additive and ratio:
3) Other Oil: Specify
3A) If additives with Other Oil what Additive:
4) Oil Analysis performed?
4A) Results of Oil Analysis (general terms: how many hours deemed OK before dropping oil):
Please include comments.

We all know the certified engine mfgs will only approve Aeroshell and P-66 for they have the STC. From my study the only difference in certified GA engines and automotive engines is the lead in the fuel, and that Shell claims they neutralize the effects of the lead in the oil and that auto oil mfgs do not have to deal with lead anymore. I know folks are running Castrol Synthetic, Royal Purple, Redline, Mobil One, Amsoil and other synthetics in certificated engines. I can't see a negative to this, someone please tell me specifically how I am wrong. If touting Aeroshell then please be as chemically specific as possible and cite data (links).
I am ready to change to an automotive synthetic racing oil. This would provide quite a layer of protection should I (we) run hot on a climbout. The synthetics don't really start to get into breakdown until approaching 400F.

Let's see what the cat drags home!

Mark Magee
N34XL XLFG 300HP
Brady TX

'Texan by Birth, Canardian by Choice.'






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