Ed, and group,
I Spoke to the engineers at Permetex and they said in an oil exposed seal surface, "Use the Ultra Black silicone." This formulation provides good resistance to both engine oil and ATF. I did the transmission in the car with this after another product leaked. The Ultra Black hasn't leaked a drop in 20,000 miles.
Bill Jepson

----Original Message-----
From: Ed Anderson <eanderson@carolina.rr.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, 12 Jul 2007 12:50 pm
Subject: [FlyRotary] Oil Seal Gasket vs Sealant was FlyRotary] Re: The adventures of Chris and Dave..


I find this discussion about sealant Vs gasket interesting. My "Plugs Up" installation has the engine sitting on its side, so naturally the oil flows right across the seam of the oil pan and block. I use the Red RTV sealant for sealing and have for six years. When I tried (early on) a gasket, I found that the gasket eventually soaked through and dripped. So I guess I am really surprised that with the engine in its normal orientation (with the oil pan on the bottom) that some are having problems with leaks. 
 
I would suggest a close examination of the fit between pan and the mounting plate. One way is to stick a light bulb in the oil pan (remove oil first) and then put the pan on. If you see any light around the seam then you may have a dented, ding or mussed up surface causing the leak. 
 
Ed 

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