Thanks for this Michael,
As I read, it I thought of another thing that Michael Newton mentioned in our gearbox oil discussion,
and that was the need of good protection of high load components like crown wheels and pinions.
Michael used the word "Hypoy", a word I associate with Castrol but one that I think is being superceded.
This is exactly what the oil you have adopted does, although the upper viscosity number is possibly a little high.
I have attached a Castrol Hypoy C 75W-90 product sheet.
They say that it exceeds API Service GL-5 lubricant standards.
So I'd seriously consider it along with your Red Line and the Penrite products.
Peter
--Original Message Text---
From: Michael Roberts
Date: Fri, 21 Mar 2014 16:10:46 -0700 (PDT)
Just to through my 2 cents in, When I recently rebuilt my gearbox with new crown wheel and pinion, bearings oiler plate, Locker (LSD) and so on. I looked into what was available to help protect my sizable investment. This is what I finally came up with after talking with some rally gearbox builders (Red Line Lightweight shockproof gear oil). It's not cheap and probable over kill but don't want to have any issues. I have only done about 5K since it went in so really don't know how it is performing but no issues so far. Using it in the front locker as well.
Cheers,
Michael R
On Thursday, March 20, 2014 10:59:18 PM, Peter Schweinsberg <peter@peterandval.com> wrote:
Dear All,
I have picked up the Bergmeister and "flown" home in it, she goes like the wind,
but before I left, as promised, I had a chat with Michael Newton, Porsche engineer and gearbox professional..
Did he help with regard to our discussion on GL4 versus GL5 and claims that there are oils that are satisfactory as both GL4 GL5.
The answer is no.
But what he did say is that he uses oils that work and give his customers the least problems.
Are the oils he uses today the same as what he used ten/twenty years ago ?
No, but most have the same names and the cursory details are the same.
What he means is that he is still using "X" but the manufacturer of "X" has continually improved the product.
Michael has made one significant change over the years, and that is he only uses synthetic oils.
So where to from here ?
I downloaded the attached PDF from the web after putting the words "GL4 gearbox oil" in as a Google subject enquiry.
It covers much of what has been raised in our E-mail discussion.
After reading it, I suggest that I'll consider following manufacturer's instructions, all the while realizing that the oils we buy today are very different to what we had available 10, let alone 20 years ago.
This means that I will probably use a top brand Synthetic Multigrade GL4/GL5 such as:
Penrite Full Synthetic PRO GEAR 75/90.
For more on this and other Penrite gear oils go to:
http://www.penriteoil.com.au/tech_pdfs/1200%20-%20Gear%20Oil%20Range%20Update%20Aug%202012.pdf
Hope this helps, and thanks to those who raised it.
I will continue to be interested in this discussion and hope that we might find even more definitive help.
Peter
.
--Original Message Text---
From: Greg Esposito
Date: Thu, 20 Mar 2014 01:25:06 -0700 (PDT)
Phill, you are completely missing the point. This is not about putting GL5 in a syncro transaxle. I have always advocated the use of GL4 in syncro transaxles. This is about a NEW product which is BOTH GL4 and GL5 certified. You had a conversation with oil specialist about wether or not to put GL5 in a gearbox that should have GL4. They said use GL4. I 100% agree with that. What we need to find out from said oil specialists is what has changed in oil technology that they can offer both ratings in the ONE product. Is it just the MT1 rating? I am not claiming nor have I ever claimed to know more than a chemical engineer, I am merely pointing out what is available from oil companies.
From: "plander@optusnet.com.au" <plander@optusnet.com.au>
To: Syncro_T3_Australia@yahoogroups.com
Sent: Thursday, 20 March 2014 3:38 PM
Subject: Re: [Syncro_T3_Australia] Re: Gear oil GL-4 / GL-5
I'm only repeating what the oil specialists told me. They would know more than any mechanic or gearbox rebuilder would.
I have no idea what the actual performance or chemical difference is between GL4 and GL5.
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