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Old 10-11-2018, 07:09 AM   #11
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Glad to here that! I figured severe was a lot of stop and go! Iím at 40,000 now so I got 10,000 to figure it out. Iíve had the spin on filter changed. Looked at YouTube last night on changing the 2 internal filters. Doesnít look to bad.
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Old 10-12-2018, 09:41 AM   #12
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Rob, how many miles do you have on your Seneca and when do you plan on changing the transmission oil? Sam
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Old 10-12-2018, 11:11 AM   #13
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May be stay with Allison service manual schedule. That way if some thing goes out they can not blame it on you!
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Old 10-12-2018, 12:04 PM   #14
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Rob, how many miles do you have on your Seneca and when do you plan on changing the transmission oil? Sam
I have a little over 28K. I will probably wait till 50K unless I think the fluid is getting dirty or the least bit "burnt".
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Old 10-12-2018, 07:02 PM   #15
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I finally found the Allison manual and found the maintenance schedule.

"Severe duty" is defined as stopping more than once in a mile. So it is safe to assume our RVs are "General" use and call for the fluid and filters to be changed at 50,000 miles OR 24 MONTHS with "TES 389 fluid", which is what I assume we have from the factory. With TES 295 or 468 fluid the interval is 150,000 miles or 48 months.

So the age old question: my Seneca has only 16,000 miles BUT the chassis is coming up on 2 years since it was built in January of 2017. Do I wait on the 50,000 miles (which will be like four or 5 years) or follow the time and service at 24 months?

Does oil / fluid really go bad in 1 or 2 years? I guess the other option is to get the fluid tested.
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Old 10-12-2018, 07:33 PM   #16
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Does oil / fluid really go bad in 1 or 2 years? I guess the other option is to get the fluid tested.
Doesn't really go bad, collects moisture if not driven regularly to get hot.
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Old 10-12-2018, 07:48 PM   #17
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Doesn't really go bad, collects moisture if not driven regularly to get hot.
So can we ignore the manufacturers instruction to change the fluid at 24 months? Or oil at 12 months?

I've struggled with this question over the years in boats, motorcycles and other toys that came nowhere near the milage requirement to change the oil but went way over on time.
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Old 10-16-2018, 06:25 AM   #18
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I just got off the phone with Allison customer service. As per my transmission serial number, we have TES 295 transmission fluid in our Seneca transmissions.

That means our maintenance schedule calls for changing the Control Main (spin on filter) at 24 months or 50,000 miles and the fluid at 48 months or 150,000 miles. This is on page 79 of the Allison manual for the TES 295 schedule.

Now as to the Freightliner service writer telling me I need to change the transmission fluid now with 16,000 miles on it, well its nice to know that all dealers are the same, trying to maximize profit
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Old 10-16-2018, 06:59 AM   #19
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That means our maintenance schedule calls for changing the Control Main (spin on filter) at 24 months or 50,000 miles and the fluid at 48 months or 150,000 miles. This is on page 79 of the Allison manual for the TES 295 schedule.
Thanks for researching that info. Practically speaking and in my opinion (but I am not an Alison engineer), these service intervals were developed for a truck running thousands of miles each month hauling freight, accumulating close to 100K miles in a year. I personally will continue to ignore the time element and instead rely on (1) eye and nose dipstick inspection, and (2) the 50K/150K mile service ceilings. It's not like these gearboxes are exposed to piston blowby and whatnot that would rapidly contaminate the TES 295 fluid.
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Old 10-16-2018, 08:27 AM   #20
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I noted a number of you mentioned rear diff leaks. Mine had a leak as well. $1500 of labor and $10 of parts. Seems number of failures on diff with so few miles should be an issues Freightliner owns up to.
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