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Topic: Muncie 4-Speed Oil

in Forum: C3 Driveline Components


Muncie 4-Speed Oil

Posted: 7/10/04 7:15am Message 1 of 3
Former Member
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Lake Oswego, OR - USA
Joined: 12/29/2002
Posts: 355
Vette(s): 1968 Corvette T-Top Coupe, 427 L71, Rally Red Exterior, Saddle Interior
Getting ready to change the oil in my 1968 Muncie M-21 4 speed. Would like to know what brand and weight oil everyone is using or recommends.

Mark


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Muncie 4-Speed Oil

Posted: 7/10/04 8:52am Message 2 of 3
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smithfield, RI - USA
Joined: 4/22/2002
Posts: 53
Vette(s): 1979 corvette l-82 4-speed t tops no a/c canadian car
it should be 75 w90 weight for the gear oil. Put some a synthetic amsoil in. It protects it alot better then regular dino oil. or use any synthetic. I put penzoil synthetic in my 4 speed and it works fine.
rj


Muncie 4-Speed Oil

Posted: 7/10/04 1:24pm Message 3 of 3
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Miramar, FL - USA
Joined: 3/16/2004
Posts: 672
Vette(s): 1972 coupe/350 cid/mild cam/4 spd/20 ft. paint (looks perfect from 20 ft.), but it sure runs nice.
 corvette427 said: Getting ready to change the oil in my 1968 Muncie M-21 4 speed. Would like to know what brand and weight oil everyone is using or recommends.

Mark
 


My M-21 leaks and I noticed it leaked more when I had synthetic (Red Line 75w-90 NS) in there. Supposedly, the molecules are smaller in synthetics, therefore getting into all the nooks and crannies better (love the smell, too). It's pretty expensive stuff to see it spotting the garage floor so I switched to Valvoline with no noticible difference in performance. The Diff has Red Line in it still. If it doesn't leak, I'd use synthetic.

JR |saluteflag|


in Forum: C3 Driveline Components


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