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View Full Version : Mobil 1 V-Twin 20W-50 or Mobil 1 Gear Lube 75W-90


kbfarkas
10th November 2006, 15:01
I have been through the threads covering the Primary/Trans oils. I am going to use Mobil 1. I am just confused on which oil to use.
I guess what I am looking for is the pros and cons of these 2 Mobil products on 1 thread.

DJJSR
10th November 2006, 15:29
20W-50 is what I've been using. I never heard of anyone using 75W-90 in a primary. Seems like it would be too thick.

semjpm
10th November 2006, 15:34
Viscosity of the 75W-90 gear oil is very close to 20W-50 motor oil. Gear and motor oils use different methods to determine viscosity. (The great part about standards is that there are so many to choose from). The shearing characteristics of 75W-990 gear are better that 20W-50 in a trans. The main difference is the additive package and potential impact on the fiber clutch plates. Some use it with good results however, YMMV.

SEMJPM

XLFREAK
10th November 2006, 15:39
At my 1000 mi service I switched to Mobil 1 V-Twin 20w-50 in the engine and Mobil 1 85w-90 in the primary. Have not noticed any diff as of yet. Runs and shifts like butter. I now have around 2200 mi on the old girl. :tour

TJ

gamhill
10th November 2006, 15:52
75W-90 has nothing to do with the 'thickness' of the oil - this is an arbitrary number assigned by API for tracking. Gear oil doesn't have the cleaners to remove by combustion byproducts, which are not needed in the transmission. The cleaners can affect the clutch disks.

I run Mobil V-Twin 20W-50 in the engine, and Mobil 1 75W-90 gear oil in the primary.

tstoeckel
10th November 2006, 16:11
I also run Mobil V-Twin 20W-50 in the engine and Mobil 1 75W-90 gear oil in the primary. Seems to work great for me.

clayvis
10th November 2006, 16:39
I use Amsoil 20w50 in the motor and Mobil 1 75w90 in the transmission. I have 17,500+ miles now and my bike shifts like butta.

ken01976
10th November 2006, 17:26
I run 20w50 in the primary

Gone
10th November 2006, 19:00
I run Mobil 1 20/W50 oil and Formula+ in Primary. Might change primary to Mobil 1 75/W90 gear oil on next primary service.

melcheld
10th November 2006, 19:47
I ran 75w90 M1 in my primary this season. I didn't notice any difference over M1 20w50 V-Twin.
I did however, develop a pretty fast oil leak (more than seeping) from my primary gasket about 1 week after the switch. I've experienced (and read about) oil seepage becoming more evident when switching from dino to synthetic (mostly in my rocker box gaskets). Since I was aready running synthetic motor oil prior to using the sythetic gear oil however, I do not necessarily attribute the leak to the oil. Actually, upon removing the primary cover, the culprit was a split in gasket around one of the bolts. The new style metal gasket took care of it and haven't had any leaks/seepage since.

I HAVE NOT experienced ANY of the clutch slippage, degredation of clutch plates , or any other ill effects from gear lube's friction modifiers that the superstitious people here would have you believe. I know I'm not the only one running M1 75-w90 in the primary with no problems.

Cheers,

Luke

kbfarkas
10th November 2006, 19:48
Cool, this is the kind of input I am looking for.
Thanks

Takingabreak
10th November 2006, 20:22
Since your still under warnaty, I would suggest you check with your dealer first.

clarkg1124
11th November 2006, 00:26
I replaced the Syn3 at my last oil change with 20w50 V-twin in the engine and 75w90 in the primary.The engine is noticably quieter now,with almost no lifter or valvetrain noise.The primary side is quieter,also,and the clutch engagement is much smoother and more progressive.
The only beef I have is that the 75w90 STINKS when it gets hot!!!!I can live with it,though.
Clark

thunderpaw
11th November 2006, 00:52
I run the Mobil 1 15W-50 in the motor and 75-90 gearlube in the primary/trans. Good results.

Kim

Wizzard Of Odds
17th November 2006, 18:12
20W-50 is what I've been using. I never heard of anyone using 75W-90 in a primary. Seems like it would be too thick.

75w90 is nearly identical in viscosity to a 10w45 motor oil.

It's not too thick. they just use a different scale for motor and gear oils.

Wizzard Of Odds
17th November 2006, 18:18
I HAVE NOT experienced ANY of the clutch slippage, degredation of clutch plates , or any other ill effects from gear lube's friction modifiers that the superstitious people here would have you believe. I know I'm not the only one running M1 75-w90 in the primary with no problems.

Cheers,

Luke

Same results here!

Little Man
20th November 2006, 11:43
I had a rattle in 4th gear that has driven me mad for two years.I had the dealer rebuild it,a independent Shop rebuilt it also.Still rattled.I switched to Mobil 1 gear lube 75w-90.The rattle did not completly disapear until i got around 2000 miles on the oil.My primary is quiet,and it shifts great.

marcel
27th November 2006, 20:30
I'm another Mobil1 gear oil 75W-90 satisfied customer. Actually, any gear oil designed for limited slip axle clutches would work just fine, synthetic lubricating properties will just last longer.

opiewontaylor
27th November 2006, 20:46
I run the Mobil 1 15W-50 in the motor and 75-90 gearlube in the primary/trans. Good results.
Kim
Same here.