I looked through out the posts and didn't find what I was looking for so I'll ask it now:
2009 GL1800 w/Hannigan trike kit; I was told to use 80/90 gear oil as directed by Ford/Mercury for a Motorcraft 7.5" differential. I used to use ProHonda Shaft Drive Oil Hypoid Gear Oil SAE 80W90 in the stock rear end, then switched to Spectro SAE 80W90 Hypoid Gear Lubricant. I still have a couple of bottles of the ProHonda and a case of the Spectro. Would I still be able to use these oils instead of going out and hunting up another type because it was recommended by Ford/Mercury? Please let me know, in the meantime Iam going riding and enjoy my new toy.