[Healeys] Does synthetic oil leak more?

Ron Fine ronfineesq at earthlink.net
Sat Jan 11 10:23:41 MST 2020

I was sure I was going to be the first one to have a leak free Healey when I rebuilt my engine/transmission in 2004.  It was leak free for the first year or so, but, after that I have the usual drips.  I keep a piece of cardboard under the car to keep track of the leaks.  I assume that age and use just opens up the leaks over time.

Ron Fine

From: Jean Caron 
Sent: Saturday, January 11, 2020 8:57 AM
To: Harold Manifold ; warthodson at aol.com ; 050.rpl at gmail.com ; healeys at autox.team.net 
Subject: Re: [Healeys] Does synthetic oil leak more?


It is possible to have a leak free Austin-Healey, once the oil has all drained out!!!!!!!




Sent from Mail for Windows 10


From: Harold Manifold
Sent: January 11, 2020 10:53 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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