Hello Kurt , I have been through this many times here on the board but not with you . 80 / 90 WEIGHT MINERAL OIL is the spec for 800'S OR 801'S also NOT GEAR OIL . Don't listen to the crap you will here about out dated oil specs , the oil made to the old specs is just as good as any other oil on the market when made by the large brand names like the ones I use , TEXAS REFINERY CORP. , MYSTIC BRANDS , KING OIL , VALVOLINE plus many others . Crap like WAL-MART and TRACTOR SUPPLY don't make the old spec oils because of limited sales THAT'S THE BOTTOM LINE MONEY , Same with crap from NEW HOLLAND it is a FITS ALL OIL they do not care if your old tractor lives or dies because it does help them sell more new tractors . If you are using 90 weight GEAR OIL in your 8N that is not correct , you should be using 90 weight MINERAL OIL and it will work fine all year round , that is the correct spec oil for the N's . UTF is too thin for those pumps and add to the fact 50-70 years of wear it makes it worst still . Any decent Parts supplier or Oil Supplier can get it very easy as Over The Road Class 8 Semi's still use it in their transmissions . Thanks Tony
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