12 Bolt posi oil kind ? and how much - Team Camaro Tech
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post #1 of 7 (permalink) Old Jun 13th, 03, 04:43 AM Thread Starter
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Question

I have a 12 bolt posi on my car its all gm ...what kind of oil does it need and how many Thanks

1969 camaro rs ss
twin turbo
ls1
t56
12 bolt 3:31
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post #2 of 7 (permalink) Old Jun 13th, 03, 05:38 AM
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About 2 1/2 pints. There are many good rearend fluids. I use Mobil 1 80W90 synthetic in my race cars and street cars. Never had any problem. I road race in Vintage racing for as much as 3 hours straight and it runs clean. I use this in my 4 speeds that do not require ATF (automatic Transmission fluid). Some manual transmissions use ATF. Do not forget to add the GM "positraction" additive if you have a GM (clutch) type positraction unit in your rearend.

Amsoil, Royal Purple and others also make great synthetic rearend fluids. Big difference for me is that Mobil 1 is available at the local parts store.

Regular rearend fluid (non synthetic) will also give you great service. I use synthetic fluids in my collector cars because I change fluids once a year based on time, not mileage. Of course the race car gets oil changes after every race, transmission and rearend every 3 races.

Hope this helps.

Mike
Nashville, Tn.
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post #3 of 7 (permalink) Old Jun 13th, 03, 05:42 AM
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Defintely use a good 100% synthetic. I use the Series 2000 Amsoil 75w90 and its awesome. It has the posi additive built into the oil, no need to add more.
I love my posi [img]graemlins/thumbsup.gif[/img]

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post #4 of 7 (permalink) Old Jun 13th, 03, 09:01 AM
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I think a 12-bolt holds more like 4 pts. Whatever, just put the posi additive (if needed) in, then fill it up until it flows back out of the hole.
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post #5 of 7 (permalink) Old Jun 13th, 03, 09:55 AM
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2 quarts = 4 pints and using the drip out the fill hole guideline I usually have a little left over in the second quart. Add half the first quart and then mix the posi additive into the rest before finishing off the quart. Top off with the second quart until it leaks out the fill hole...

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post #6 of 7 (permalink) Old Jun 13th, 03, 02:14 PM
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I use the Amsoil 75W90 Series 2000 in the posi rear ends that I build. If you use regular gear oil then you need to add the GM additive #1052358.
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post #7 of 7 (permalink) Old Jun 13th, 03, 06:43 PM Thread Starter
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thanks to everyone for the info =D

1969 camaro rs ss
twin turbo
ls1
t56
12 bolt 3:31
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