Quick Oil ?
Road Master
Joined: Sep 2009
Posts: 932
Likes: 2
From: Pacific NorthWest Territory
The viscosity of 20w50 MOTOR OIL is very similar to 80W90 GEARLUBE. Note we are comparing apples to oranges. The two are measured differently. Many people claim there is less tranny "clunk" which I can understand. Coming from metric all my life, with the transmission integrated with the engine, I have no problem running 20w50 in the transmission.
Just fill her up and ride.
Just fill her up and ride.
Elite HDF Member
Joined: Sep 2006
Posts: 3,718
Likes: 11
From: Punta Gorda,FL
That's what I put in my 2005 SE Fat Boy.
I was using Mobile 1, 75/90 gear oil in the tranny, but read where Mobil doesn't recommend it, so I just use Mobil 1, V-twin in all the holes. I can't tell any difference as far as the transmission shifting, either way it worked fine for me.
Tom
I was using Mobile 1, 75/90 gear oil in the tranny, but read where Mobil doesn't recommend it, so I just use Mobil 1, V-twin in all the holes. I can't tell any difference as far as the transmission shifting, either way it worked fine for me.
Tom
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Outstanding HDF Member
Joined: Aug 2005
Posts: 3,167
Likes: 7
From: FL & SoCal
Yep... I've always used HD Syn3 in all 3 holes...Was thinking of switching to Mobil or Amsoil just because I'm tired of the MoCo ripping me off....their prices keep going up and up and I don't think their quality is ;-)
Club Member
Joined: May 2007
Posts: 145,895
Likes: 821
From: 40 miles Northeast of Indy..
Yes U can, but the Mobil GL 75-90 has additives for gears and I feel it does a better job that the 20-50 Mobil 1 in the tranny.
I switched last yr to Mobil oils and I really like them for our Ind weather..
I did try the Bel-ray Hypoid 85-140 once before going to the Mobil GL, But for me it was too stiff shifting for the first 5 miles or so.
For me the Bel-Ray 85-140 GL was just too heavy for our below 70 temps in the spring and fall, it did alright when the temps were about 85 or above. So in the hotter temp states it'd probably be OK, just not here in IND. Also its not a SYN lube but the dealer said to try it, I did and didn't like the way it shifted at all before she was up to operating temp.
I've use SYN3, Formula+, BEL-RAY and Mobil 1- GL75-90.
IMO, Mobil 1GL 75-90 is the one I like the best and am staying with in the tranny.
I switched last yr to Mobil oils and I really like them for our Ind weather..
I did try the Bel-ray Hypoid 85-140 once before going to the Mobil GL, But for me it was too stiff shifting for the first 5 miles or so.
For me the Bel-Ray 85-140 GL was just too heavy for our below 70 temps in the spring and fall, it did alright when the temps were about 85 or above. So in the hotter temp states it'd probably be OK, just not here in IND. Also its not a SYN lube but the dealer said to try it, I did and didn't like the way it shifted at all before she was up to operating temp.
I've use SYN3, Formula+, BEL-RAY and Mobil 1- GL75-90.
IMO, Mobil 1GL 75-90 is the one I like the best and am staying with in the tranny.
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Outstanding HDF Member
Joined: Aug 2005
Posts: 3,167
Likes: 7
From: FL & SoCal
Think I will go this route. Since we live pretty close and in the same hot/humid climate, which is really tough on engines, I will go this route.
That's what I put in my 2005 SE Fat Boy.
I was using Mobile 1, 75/90 gear oil in the tranny, but read where Mobil doesn't recommend it, so I just use Mobil 1, V-twin in all the holes. I can't tell any difference as far as the transmission shifting, either way it worked fine for me.
Tom
I was using Mobile 1, 75/90 gear oil in the tranny, but read where Mobil doesn't recommend it, so I just use Mobil 1, V-twin in all the holes. I can't tell any difference as far as the transmission shifting, either way it worked fine for me.
Tom
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