Transmission Fluid, ???? Options

[mxhondarider832]

I have a '74 914 and the transmission is a little leaky and need to change the fluid, the book says to use straight 90w oil but I am having a really tough time finding it so I was wondering if there was a newer substitute that I could use. This is my first 914 and I am struggling a little bit and could use some help thanks

[Dr Evil]

Use what you want. I already posted my experience in several places, and in the 31 pages of notes, that you should read, that comes with a TOC. Tranz oil is absolutely a wear item; Heat and dirt.

[SirAndy]

Tranz oil is absolutely a wear item; Heat and dirt.

Chemically speaking, it doesn't get hot enough to start breaking down. Thus my comment about not being a "wear" item.

Never did i say anything along the lines that it doesn't get dirty or that it should never ever be replaced.

However, i do disagree with those who claim that one must replace the transmission oil at similar (or close to) intervals as engine oil.

And yes, i still run Swepco, and yes, i'm still happy with the shifting. YMMV.
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[Dr Evil]

Tranz oil is absolutely a wear item; Heat and dirt.

Chemically speaking, it doesn't get hot enough to start breaking down. Thus my comment about not being a "wear" item.

Never did i say anything along the lines that it doesn't get dirty or that it should never ever be replaced.

However, i do disagree with those who claim that one must replace the transmission oil at similar (or close to) intervals as engine oil.

And yes, i still run Swepco, and yes, i'm still happy with the shifting. YMMV.
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I guess we will have to agree to disagree. At what temp would you consider oil to be a wear item? Chemically speaking, it is breaking down inside the bottle. It is degrading the moment it is created. Heat accelerates this, more heat even faster, but it is not necessary. Since the oil is less heated than engine oil, it need not be replaced other than at the 10Kmi interval recommended by the engineers at Porsche. I recommend Swepco be changed more often as it still gets dirt and gear crap in it, but that it keeps it in solution so that it may interact with the other parts of your gear box on a regular basis. Will this be witnessed in the short term? No way, long term this will lead to $$$.

Mark, you are on the ball. This seems to be like a religion or politics discussion.