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RodLyle

Almost Heaven

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Joined: 02/17/2007

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Posted: 05/04/12 06:23pm

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Owners manual says I should change the fluid and filter 24 months or 15,000 miles. Allison 6 speed transmission.

I have done it on schedule that last two times. Does it really need change that two year period? I only put 5,000 on it the last couple of years.

Thanks

wolfe10

Texas

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Posted: 05/04/12 06:56pm

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Large part of the equation depends on whether you are running Dexron or Transynd:

http://www.allisontransmission.com/service/changeinterval/

Click on your transmission family for Allison recommended service intervals.

Brett Wolfe
1997 Safari Sahara 3540
EX: 1993 Foretravel 36' U-240

FMCA Forum: www.community.fmca.com/index

Diesel RV Club:http://www.dieselrvclub.org/

wny_pat

Western NYS

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Posted: 05/04/12 07:19pm

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And Allison can do a used oil analysis on your oil to see how well it is holding up. Probably cost you 15 or 20 bucks.

rexabbot

Cumming GA

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Posted: 05/05/12 05:58am

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I use Amsoil. Per Amsoil website: SERVICE LIFE
Recommended for 50,000 miles in severe service* and 100,000 miles in normal service;* or per vehicle manufacturer-recommended intervals, whichever is longer.

*As defined by vehicle or transmission manufacturer

X2 on getting your fluid tested if you think you need to change it.

rgatijnet1

Florida

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Posted: 05/05/12 06:02am

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If you are still under warranty I would follow what Allison recommends for their service intervals. I would also not use Amsoil, which is not an approved replacement for Transynd oil. It may work just fine but since it is not approved by Allison, why take a chance with your warranty? If your transmission is out of warranty, then service intervals, and fluid choices, are all your choice and responsibility.