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Just add lightness...
 
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915 Gearbox oil capacity

Can anyone tell me what is the oil capacity for a 915 gearbox ?

Thanks
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Old 12-05-2008, 03:57 AM
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3.0 liter or 3.17 quarts
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Old 12-05-2008, 04:11 AM
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Just add lightness...
 
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Thanks. So a 4 liter Swepco "bottle" will do.
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Old 12-05-2008, 04:21 AM
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Yes the Swepco jug Pelican sells is more than enough. Just keep pumping it in there until it starts spilling out.
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Old 12-05-2008, 04:42 AM
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Make sure you can remove the fill plug BEFORE you remove the drain plug.
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Old 12-05-2008, 06:10 AM
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And make sure to fill the trans when is it is nearly level. If you fill it with only the rear jacked up, you will overfill it if you just fill it until it spills out the filler hole.
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Old 12-05-2008, 08:55 AM
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Quote:
Originally Posted by MBAtarga View Post
Make sure you can remove the fill plug BEFORE you remove the drain plug.
+1, i learned this the hard way!!!! One Swepco jugs works perfect.
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Old 12-05-2008, 09:21 AM
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Since this thread is listed at the top of google results for "915 transmission capacity", I figured I'd bump it to ask a question.

Changed the fluid in my 915 transmission with limited slip differential today.

Upon removing the fill plug, a good amount of fluid came out. I would say at least a quarter of a liter.

Drained, refilled, and was able to put just shy of 3 quarts back in. There was a "good trickle" of fresh fluid coming out of the fill when I put the plug back in.

The car was as level as possible on jack stands. I even measured from 12 o'clock on each wheel opening to the ground; all within a half inch.

Was the transmission simply a bit overfilled?
Old 10-13-2019, 03:25 PM
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A quarter of a liter isn't much to drip out. My understanding is that you really can't "overfill" these systems. Even if you angled the car to fill it in such a way that you got more in than the three liter capacity, any extra just sloshes around without doing any damage.
Old 10-13-2019, 03:32 PM
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tmadden2, thanks for the reply.

I filled it until there was a good trickle of fluid coming out, so I don't think I under filled. This is my first 911 so there are plenty of new and interesting experiences. I've never had fluid come out the fill plug of a conventional rear axle differential.
Old 10-14-2019, 06:22 AM
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I run "extra" oil in my race car 915...darn near the full 4 quarts with zero issues.
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Old 10-14-2019, 01:49 PM
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