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Date:         Tue, 27 Feb 2007 22:48:13 -0500
Reply-To:     Dennis Haynes <dhaynes@OPTONLINE.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         Dennis Haynes <dhaynes@OPTONLINE.NET>
Subject:      Re: Mobil Delvac ATF or Brand of Dexron Automatic Trans oil best
              suited for Vanagons
Comments: To: Mark Keller <kelphoto@TELUS.NET>
In-Reply-To:  <45E07D81.3070606@telus.net>
Content-type: text/plain; charset=us-ascii

I think your symptoms are just getting worse and the fluid change is mostly coincidental. It sounds like you are have a problem developing clutch pressure in the direct or forward clutch pack. Bad internal seals, ruptured piston, or worn, broken seal rings on the direct drum. The Bentley has a procedure for measuring pump pressure and a look up table of the expected pressures for each gear position and speed. Time for some diagnostics.

All the Dexron fluids are basically 10w oil. The different specs are the friction modifiers and required performance such as oxidation resistance, seal compatibility, etc. The Vanagon tranny is so lightly stressed, that any fluid will do. For extra grab, some like the Ford, (Mercon), fluid as it does not have the friction modifiers so the clutches lock up harder.

Dennis

-----Original Message----- From: Vanagon Mailing List [mailto:vanagon@gerry.vanagon.com] On Behalf Of Mark Keller Sent: Saturday, February 24, 2007 1:02 PM To: vanagon@GERRY.VANAGON.COM Subject: Mobil Delvac ATF or Brand of Dexron Automatic Trans oil best suited for Vanagons

Hi Dennis,

I know you may have gotten the anwser by now but I thought I'd send this along. http://www.mobil.com/USA-English/Lubes/PDS/GLXXENCVLMOMobil_Delvac_Synthetic _ATF.asp

The reason I'm here is that I have recently replace the xsmn oil in the Carat, with Pennzoil DEXRON III/ MERCON. I notice a mushy 3000 to 3250 ish RPM range and have lower overall highway milage. To boot the van is parked on a 7 degree grade, and before on cold start up I noted that the xsmn needed a few secs in gear or idle before there was power xxsmn to the wheels. NOW this happens more regularly and on no slopes to. I reliaze the issue is basically with the drain hole in the torque converter, but with the new oil all the issues seem more pronouced. As the Manual says DEX or DEX II, I wonder if DEX III is less viscous, as my sypmtoms seem to indicate and if so, how to go about getting a closer to original designed oil.

Mark Keller 91 Carat


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