stevebeilgard Posted March 30, 2011 Report Share Posted March 30, 2011 if this subject has been broached before, i missed it. how often do you change oil on an auto transmission? i've done my regular ones at 75,000 miles but i'm told to go 150,000 on the duramax allison trans. i'm told the allisons use only synthetic oil. anyway, what do you guys think? Quote Link to comment Share on other sites More sharing options...
wtnhunt Posted March 30, 2011 Report Share Posted March 30, 2011 Good question Steve, will be nice to hear from Shaun and Lynn. I usually go off the owners manuals for those services. Quote Link to comment Share on other sites More sharing options...
Shaun_300 Posted March 30, 2011 Report Share Posted March 30, 2011 Should be the other way around, I'd do it every 50,000 miles or so with your HD Steve, even every 40,000 wouldn't be overkill, the towing makes the fluid break down faster. The Allisons use regular Dexron-VI. Good idea to do it regularly, those transmissions are around $6,000. Quote Link to comment Share on other sites More sharing options...
LETMGROW Posted March 30, 2011 Report Share Posted March 30, 2011 I'm not a big advocate of trans fluid changes unless they have been done on a regular basis. I change mine at 25,000 miles. The problem I see is where someone has hit the 90-100,000 mark and they decide to change fluid and put in a new filter. The new fluid with fresh additives can loosen dirt and varnish on the internal parts, valve body and case. Now it is released and sent to the filter. If you have a high mileage vehicle you might consider changing the fluid, drive for a couple thousand miles and change it again. If I have a high mileage vehicle come in with dark looking or varnish smelling fluid I warn the customer he may be waking a sleeping dog and recommend a second change soon afterward. I shy away from the tranny repair in a can. If your fluid looks good and doesn't smell bad, go ahead and change it. If you use a truck to plow with, a vehicle to tow with or drive really hard, you might consider 25- 50,000 mile intervals. Lynn Quote Link to comment Share on other sites More sharing options...
stevebeilgard Posted March 30, 2011 Author Report Share Posted March 30, 2011 thanks for the tips. the chevey dealer recommends every 150,000 for the trans and 7500 for the engine. i've always considered the fact that they are making their money by selling new vehicles and change my oil every 3000 miles and trans at 75,000. i guess i'll get it done a bit sooner now. Quote Link to comment Share on other sites More sharing options...
LETMGROW Posted March 31, 2011 Report Share Posted March 31, 2011 Honestly, I have never seen a vehicle suffer from too many fluid changes. I don't like to waste money but don't like to spend it because I slacked on something as important as good maintenance. I'd rather wear out a drain plug than an engine anyday. Lynn Quote Link to comment Share on other sites More sharing options...
Shaun_300 Posted April 1, 2011 Report Share Posted April 1, 2011 I have a transmission apart down to a bare case on my bench right now due to lack of maintenance. Luckily he's getting warranty to repair it. It's actually so bad that the whole thing has to be replaced. Should take pics of it and share with a title: This is what happens when you don't maintain your vehicle. Quote Link to comment Share on other sites More sharing options...
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