What type of oil in Getrag - Dodge Cummins Diesel Forum
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Old 12-19-2008, 09:41 PM   #1 (permalink)
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What type of oil in Getrag

I have a 1993 W250 cummins
with a Getrag 360 and I want to change the oil in it. So what do I use.
The truck Manuel says 5w-30 motor oil but the Dodge dealer says some special mopar oil that is syn.

Thanks
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Old 12-19-2008, 10:10 PM   #2 (permalink)
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i would think normal 5w-30 would be fine.

there should be more info on this site, but remember to overfill by one quart. Like i said, search the site, its here, and more experienced members will chime in soon.
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Old 12-19-2008, 10:39 PM   #3 (permalink)
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I run standard 5w-30 in mine, Has 255,000 on it. I overfil about a quart and a half over "stock full level". I change the tranny oil out every other engine oil change of my truck. Seems to be good so far (minus my input bearings going on the transmission.....
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Old 12-19-2008, 10:54 PM   #4 (permalink)
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The best oil for the 5 speed Getrag on first gen trucks would be AMSOIL Signature Series 0W30 Synthetic.

-Chuck
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Old 12-20-2008, 01:06 AM   #5 (permalink)
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Royal purple syncro max. And over fill that thing.
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Old 12-20-2008, 03:26 AM   #6 (permalink)
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i run the same 15-40 in my engine, tranny, and t-case.

Chris
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Old 12-20-2008, 05:28 PM   #7 (permalink)
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im suprised the amsoil dealer wouldnt recommend AMSOIL Synthetic Synchromesh Transmission Fluid (5W-30).
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Old 12-21-2008, 01:47 AM   #8 (permalink)
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I run 15w40 in my transmission- 5qts about every 20-25K. Put 75K on one, and it was still in great shape when I sold the truck.

DP
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Old 12-21-2008, 10:04 PM   #9 (permalink)
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Quote:
Originally Posted by wjones View Post
im suprised the amsoil dealer wouldnt recommend AMSOIL Synthetic Synchromesh Transmission Fluid (5W-30).
It isn't recommended for the Getrag. Don't know why, but if you want to run MTF it works well in the NV5600.
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Old 12-22-2008, 12:12 AM   #10 (permalink)
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I put the amsoil syncromesh stuff in mine and overfilled it, hasnt fallen out yet. I suppose if it does that will mean its time for an nv4500 upgrade. 85-140 regular dino in my transfer case and diffs.
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Old 12-22-2008, 04:29 AM   #11 (permalink)
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There is a good reason why lighter oils are good for the getrag. The bearings are shimmed so that there is a preload on them. Only a light oil ensures the penetration needed. Do not use gear oil or standard diesel engine oil. The reason for the over fill is that there is inadequate cooling of the pilot shaft bearings using the normal fill level. An extra quart or so of oil keeps this bearing cool under load and is said to double the life of the getrag.
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Old 12-22-2008, 11:07 PM   #12 (permalink)
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Quote:
Originally Posted by Old 'n Rusty View Post
There is a good reason why lighter oils are good for the getrag. The bearings are shimmed so that there is a preload on them. Only a light oil ensures the penetration needed. Do not use gear oil or standard diesel engine oil. The reason for the over fill is that there is inadequate cooling of the pilot shaft bearings using the normal fill level. An extra quart or so of oil keeps this bearing cool under load and is said to double the life of the getrag.

Which is why AMSOIL's top recommendation for the Getrag is the 0W30 SSO. Good info, Old 'n Rusty.

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