[Healeys] Does synthetic oil leak more?

Harold Manifold manifold at telus.net
Mon Jan 13 19:12:01 MST 2020

I agree it is very important to keep any foreign material out of the
overdrive unit. I have had good luck using Loctite Gasket Maker. See
attached picture. I believe it is a similar product to Permatex The Right


From: gradea1 at charter.net [mailto:gradea1 at charter.net] 
Sent: Monday, January 13, 2020 9:46 AM
To: 'Robert Begani'; 'Harold Manifold'; 'warthodson at aol.com';
'050.rpl at gmail.com'; 'healeys at autox.team.net'
Subject: Re: [Healeys] Does synthetic oil leak more?

Bob-that was another place the synthetic comes out...thru the threads. If
you use anything, like pipe sealer or PTFE (teflon) just be careful not to
get any near the entrance to your overdrive.  Overdrive oil must be spotless
due to the tiny drillings in the system. I was able to fix my seeps
elsewhere with Permatex "Right Stuff" but be careful again to do a very neat
job. I still recommend regular 30W non detergent mineral oil (as does the
factory book) to refill the trans and OD. Some modern oils can foam in the
overdrive and cause issues. 

Even though the factory manual states not to use sealant around the casing
seal of the brake ring-that will leak with most synthetics and also seep
with regular oil. Had to" Right stuff" the casing seam post rebuild to stop
that seeping. Another place synthetic runs out is at the bottom casing plug.
I do not have too much experience using silicone gaskets.  I rebuilt with
paper and aircraft sealer (old school-but original).  I expected leaks or
else it wouldn't be authentic British. Hank


From: "Robert Begani" 
To: "Harold Manifold"
Sent: Monday January 13 2020 5:38:23AM
Subject: Re: [Healeys] Does synthetic oil leak more?

My problem is leaking from the brass drain fitting in the bottom of the
overdrive.  When I used motor oil eventually by tightening the fitting, the
drips would stop.  With the synthetic oil the drips will  not stop.  Over
the summer, while the car was sitting in the garage, there was a puddle in
the plastic container I placed under the fitting before leaving for cooler
weather.  I just tightened the fitting a little more and the drips are
reduced to 2 per day.  Am thinking about using a thread sealant on the
fitting and RTV on the gaskets.  Or, is there a silicone gasket available?


Also, is a silicone gasket for the valve covers worth the expense to stop
leaking?  Or, a combination of silicone gasket and Ultra Permatex?  I have
aluminum alloy valve cover.


Bob Begani

From: Healeys <healeys-bounces at autox.team.net> On Behalf Of Harold Manifold
Sent: Saturday, January 11, 2020 11:51 AM
To: warthodson at aol.com; 050.rpl at gmail.com; healeys at autox.team.net
Subject: Re: [Healeys] Does synthetic oil leak more?




All of your observations are a factor. Here are some comments from an
article about synthetic oil leaks:


Synthetic oil WILL NOT cause leaks. It may however make already worn-out
gaskets/seals more evident, by leaking past them, and/or cleaning any sludge
and other gunk that was sealing the existing leak. This is because Synthetic
oil has much better cleaning properties, flows much better than conventional
oil, and hence also lubricates much better than conventional oil (This is a
good thing).


I use a GL-4 synthetic gear oil in my transmission and it leaks. Believe it
not not one of the leak mechanisms is from the interior along the bolts and
drips from the bolt head on the exterior. I am changing the gaskets on my
transmission and trying bonded sealing neoprene washers on the fasteners.


I may be pursuing the impossible dream of a leak free Healey.... Harold



From: warthodson at aol.com [mailto:warthodson at aol.com] 
Sent: Saturday, January 11, 2020 7:24 AM
To: manifold at telus.net; 050.rpl at gmail.com; healeys at autox.team.net
Subject: Does synthetic oil leak more?

I am not a leak expert, but I find this hard to understand. For there to be
a leak there has to be a hole. Is it because the synthetic oil molecules are
smaller than the non-synthetic oil molecules? Given that the "holes" come in
different sizes this seems illogical. Is it because the synthetic oil is
more slippery? How is that measured? How much more slippery is it?  

Gary Hodson

-----Original Message-----
From: Harold Manifold <manifold at telus.net>
To: 'R. Lindsay' <050.rpl at gmail.com>; 'Healey List' <healeys at autox.team.net>
Sent: Fri, Jan 10, 2020 7:55 pm
Subject: Re: [Healeys] Rear Axle Oil

The biggest difference you will notice with synthetic gear oils is they leak
more than non-synthetic. 

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