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  #411  
Old 1 Day Ago
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Quote:
Originally Posted by Four Speed View Post
I use Redline MT90 in the trans. I contacted Dave at Redline and he acknowledged that GL5 was
unnecessary in the trans but it shouldn't be too slippery. Strangely they had never tested their GL4
lube which seem to be more suited! It does have Jaso rating but it doesn't friction modifiers that
could screw the clutch or large dosages of corrosive hypoid additives. Anyway, our oil guy shaneba
produced some oil analyses that showed the GL4 had better metal figures. And it is based on excellent
PEO base stocks. You pays your money as they say.
I considered MT90 myself. The viscosity is actually a little thinner than most 75W90s.
At least that's what I read somewhere. Have you found that to be true? Still a good lube I'm sure. I wouldnt be afraid to run it.
Good reports on the Spectro STL but it's hard to find. Couple Indys are dealers but didn't stock the STL. I got 1 of the last 2 available atm on Amazon for $22. More on the way it says.
I think Rocketman is using it.
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  #412  
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Four Speed Four Speed is offline
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MT90 is a very good lube and stays in grade well. I wouldn't go too thick in the trans otherwise you will get clutch drag.

I've no experience of Spectro.
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  #413  
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I did a search here and came up with all kinds of good reviews. I'm going to run the Drag Specialties Gear and Chaincase Oil for Sportsters for the first half the summer since I just changed it late last year, then change it to the Spectro STL just to see if I notice any difference shifting smoothness, clutch feel, etc. Like others have noticed.
I had no idea that many people were running it here til I searched an hour ago.
It's not any thicker than a typical 75W90. But the 75W140 will hold up better in high heat is all.
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  #414  
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Four Speed Four Speed is offline
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Quote:
But the 75W140 will hold up better in high heat is all.
Hmmmm. I seem to recall that shaneba tried a 75w140 redline oil and it was not an improvement in metal content.
Wow: Spectro STL Viscosity: 182 CSt @ 40°C v MT90 86 CSt @ 40°C

You need the lube to flow otherwise it increases churning. That will increase temperature. e.g.
https://www.machinerylubrication.com...ty-gearbox-oil

And from SKF: The consequences of excessive viscosity in a rolling element bearing are:
An increase in friction due to the additional effort required to move thick oil away from moving rollers. These losses are called churning
losses and contribute strongly to overall bearing friction. If the churning losses are very high, rollers can slide instead of roll. This is called
roller skidding and occurs in the unloaded zone or at the entry to the loaded zone in a radially loaded bearing. Skidding can cause flat spots
on the rolling elements, which later lead to premature bearing failure. Bearing friction will increase due to increasing cage-rolling element friction,
which is strongly related to oil viscosity. Cage-roller friction contributes to roller skid. Once the oil on a raceway has been pushed aside by a passing
roller, it does not easily flow back again. Hence, the next roller will contact less oil, and the third might not even contact enough oil to provide surface
separation. This lubrication situation is commonly called starved lubrication. If the rollers are moving at high speed, starvation appears earlier, because
time for reflow between each passing roller is shorter. Starvation can lead to surface damage.


If you are worried about heat, maybe consider an oil that has a good viscosity index rather than a higher viscosity.
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  #415  
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shanneba shanneba is offline
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I used the Redline 75w-110 that has a viscosity at 100 C almost exactly the same Formula+ ~ 20 Cst. It is about 131 CSt @ 40 C.
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  #416  
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Thanks for chiming in shanneba. And did it show an improvement in metal content?
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  #417  
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Aluminum was about the same.
Iron and copper were higher.

Code:
+-------------------+-----------+-----------+----------+
|     Oil Brand     | Red Line  | Red Line  | Red Line |
+-------------------+-----------+-----------+----------+
| Weight            | MT-90     | 75w-110   | 75w-90   |
|                   |           |           |          |
|                   |           |           |          |
| ALUMINUM          | 82        | 81        | 124      |
| CHROMIUM          | 0         | 0         | 0        |
| IRON              | 58        | 74        | 101      |
| COPPER            | 21        | 56        | 42       |
| LEAD              | 2         | 1         | 1        |
| TIN               | 0         | 0         | 1        |
| MOLYBDENUM        | 16        | 6         | 7        |
| NICKEL            | 1         | 1         | 1        |
| MANGANESE         | 1         | 1         | 1        |
| SILVER            | 0         | 0         | 0        |
| TITANIUM          | 0         | 0         | 0        |
| POTASSIUM         | 2         | 3         | 3        |
| BORON             | 137       | 131       | 164      |
| SILICON           | 49        | 77        | 76       |
| SODIUM            | 5         | 8         | 7        |
| CALCIUM           | 2933      | 408       | 119      |
| MAGNESIUM         | 109       | 23        | 7        |
| PHOSPHORUS        | 1957      | 2930      | 3029     |
| ZINC              | 2199      | 392       | 162      |
| BARIUM            | 0         | 1         | 1        |
|                   |           |           |          |
| SUS @ 210F        | 77.2      | 92.7      | 78.9     |
| cSt @ 100C        | 14.83     | 18.63     | 15.25    |
| Flashpoint F      | 440       | 435       | 410      |
| Fuel         %    |           |           |          |
| Antifreeze %      |           |           |          |
| Water       %     | 0         | 0         | 0        |
| Insolubles %      | TR        | 0.4       | 0.8      |
| TBN               |           |           |          |
| TAN               |           |           |          |
| Total Wear metals | 165       | 214       | 271      |
+-------------------+-----------+-----------+----------+
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  #418  
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Thanks, very helpful as ever - some actually data. That should be a sticky!
So, MT90 has the lowest wear metals overall and half the copper content of the GL5s.
I imagine the magnesium is in the MT90 additive pack.

What are your thoughts about running an 75W140 oil with 182 CSt @ 40°C?
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  #419  
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Quote:
Originally Posted by Four Speed View Post
Thanks, very helpful as ever - some actually data. That should be a sticky!
So, MT90 has the lowest wear metals overall and half the copper content of the GL5s.
I imagine the magnesium is in the MT90 additive pack.

What are your thoughts about running an 75W140 oil with 182 CSt @ 40°C?
That's why I started the other thread. Kinda hijacked this one. My bad.
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  #420  
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Have been using Motul 7100 20/50 full synthetic and could not fault it, but just ordered some of this...

https://mannolusa.com/catalog/mannol...avidson-api-sm

It comes in at €6.50ltr, which is a great price.
I was intending to try the Harley Syn 3 but saw this and couldn't resist. Well spec'd and Harley specific. Just have to decide on filter now, stock or super 5.
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