The Delvac 75w90 can be acquired pretty reasonable from Summit Racing. As far as I can tell, the G80 doesn't call for any LS additive. I'm thinking I'll go with Delvac 75w90 as it doesn't contain any FM. I'm planning to change the front and rear differentials soon. I believe the severe service interval is 22,500 miles or 45,000 regular service. It only costs about $7 to change it, it's not gonna break the bank to change it often. I aim to change it again in 10-15k and see what it looks like. The drain plug magnet was loaded at ~16k miles. I also changed the transfer case fluid around the same time as I changed the transmission filter and it definitely needed it. I tow some other things, but those are the main two. The 25 ft trailer weighs 7k empty and about 23-24k loaded. I tow a 20 ft gooseneck cattle trailer or our 25 ft gooseneck flatbed trailer loaded with hay. I looked him up on FB after I bought it, it looks like he has some horses so I suspect that it may have hauled a horse trailer around some during the year that he had it. I would say looking at your filter that 16,000 miles is a good time to change it before the media becomes clogged.Īny idea what it pulled the first 10,000 miles and what do you pull with it now?Īn older gentleman owned it before me, it had a couple Florida addresses in the GPS when I got it (I live in KY) so I suspect that he put several highway miles on it before I bought it. Your filter has more friction material in it than mine. But once that's done, every 50k miles is MORE than often enough. I do like to perform a drain/fill and filter replacement after break-in get out the heavy residuals present from machining and break in. Don't waste your money every 50k miles for the oil/filter is more than often enough. The internal main filter is only required to be changed upon tear-down of the tranny, despite the insistence of the anal-retentive crowd.įurther, pretty much no one qualifies for "severe service" by the Allison definition, but that does not stop folks from over-maintaining their stuff. The spin-on filters the oil going to the valve-body in this application. Most of these are decent quality from the filter makers. In short, these transmission are about as finicky as the Dmax engine they sit behind that is to say, you care far more then the unit does about what oil goes in there.Īs for the filters, same goes. (TES 295 is a full bore PAO syn TES 389 is the equivalent to the old Dex/Merc fluid. Fluid type really does not matter much as long as it's a fluid destined for the application. The Alli 1000 is a good trans (made by GM for the light-duty truck applications).
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