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Old 02-09-2018, 08:40 AM   #1
[JP]
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Default again.. gearbox oil

Hi all..

so I know the use of types of oil differs a lot from person to person, so just trying to gauge what you guys are using.

For the last 4 years I have been using, on my 76 cone, Redline heavy shockproof gear oil and it's a 75w 140....

Now, I've done about 10k miles if not more on this stuff, not a problem, gearbox is good, smooth and doesn't leak.

However, I fancy changing to something a bit lighter as from reading some posts, this stuff might be just too heavy.

and seeing as now I have the 68 Genny and the 51 Pan, all will need fresh gear oil for this riding season.

I'm not really a fan of putting the same 20/50 engine oil in the gear box so I'm looking for a specific gearbox oil.

what about a 75/90?
I read a post by JAWS on here, regarding all the testing done on the GL5 safe oil, all of them listed are 75/90....

75/90 ok oil for all my three mistresses? all on 4 speed ratchet trannys.

thanks!
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Old 02-09-2018, 09:22 AM   #2
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Default Re: again.. gearbox oil

75/90 should be ok imo, 80/90 gear oil is in my 4 speeds.
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Old 02-09-2018, 10:41 AM   #3
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Default Re: again.. gearbox oil

Read the label carefully. Be suspicious of any oil listed as a hypoid lubricant. These contain EP (Extreme Pressure) additives for hypoid gears that have a lot of slip between the teeth, like helical ring and pinion gears. These EP additives are often sulfur based will attack "yellow metals", like brass and bronze that are used in the bushings of H-D 4 speed transmissions. Especially if moisture gets into the oil through condensation or other means. I learned this the hard way. After a complete trans rebuild with all new gears, bushings, and bearings, within less than a year, and about 15,000 miles it started acting up again. I pulled it apart and found that the bushings were heavily pitted and eroded. They looked like Swiss Cheese. Trying to figure out what had happened I discovered my mistake.

There are "hypoid" lubes that claim to be yellow metal compatible, but not all are. Here's an article about it with specific recommendations of good oil to use.
http://www.benchmarkworks.com/articl...h/gearoil.html

Here's another one discussing the differences in grades.
https://www.reference.com/vehicles/d...38852afbf5288e

To find more info do an internet search for "hypoid lubricants and yellow metals". Lots of discussion out there on it, especially on the old tractor sites, which are kind of like this one, LOL.
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Old 02-09-2018, 11:13 AM   #4
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Default Re: again.. gearbox oil

^Excellent answer. Always my concern these days when I pick up a bottle of "gear lube."
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Old 02-09-2018, 11:44 AM   #5
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This is safe
Canít say I noticed a difference from any other oil Iíve used
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Old 02-09-2018, 12:25 PM   #6
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Default Re: again.. gearbox oil

thanks Wizzbang, I did find a thread on here with very detailed explanation on what oils attached the bushings, that's where it mentioned the oils that were GL5 free.
and thanks for those links, I'll have a read this evening before I buy anything.

thanks richbob, I'll see how much that one is over and if is available.
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Old 02-09-2018, 01:02 PM   #7
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Default Re: again.. gearbox oil

I've always run straight 60w in my motor and the trans in my Pan or the Knuckle. And my Shovel for that matter.
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Old 02-09-2018, 02:04 PM   #8
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Itís a bit more difficult getting straight grade oils in Europe unless you mail order or are lucky with a classic bike shop(premium price)
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Old 02-09-2018, 02:40 PM   #9
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Default Re: again.. gearbox oil

Quote:
Originally Posted by richbob View Post
Itís a bit more difficult getting straight grade oils in Europe unless you mail order or are lucky with a classic bike shop(premium price)
Yep! that is correct.

Plus here in England the riding temperatures are only between 50F (if you are brave) and 82F (which only happens a couple of days of year, most of the time is around 70/75F)
For the engine I have bought a good quality 20w50 classic oil as there's not much point of anything else with the weather we get.


I think I'll go for the 75/90 in the gear box as there seems to be quite a lot of it available.
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Old 02-09-2018, 04:38 PM   #10
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Default Re: again.. gearbox oil

60 wt in that pan.... I always run VR1 from valvoline. Closest thing I can find to old oil. Other than some special racing oils. Remember when these where designed and what was around lube wise. Not much has changed parts wise... ignorance speaking here. I have never had an issue yeilding to old stiff. Admittedly I see nothing wrong with preferring point style ignitions and drum brakes.... no side bars on this. Just making a point.

Trans I run the same 60wt. I have run Bel-ray and a redline product commited to sticking to gears. I have also tried the “ power punch “ additive because I liked playing with the store display of gears and comparison to straight multi vicous oil....

I am half caveman so there is that...
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Old 02-09-2018, 08:42 PM   #11
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Default Re: again.. gearbox oil

Try Spectro gear lube. Here is a statement by them regarding their product.
“Spectro 6 Speed is GL5 rated but is safe to use in GL1 applications. We use a different formula (developed by Spectro) than other brands that is buffered. This formula will not attack “bright” metals such as brass, bronze and copper found in older transmissions. It’s more expensive to produce, but we feel the performance is well worth the cost. It also improves shifting in most applications, reduces noise (5th gear whine in HD 6 speeds) and is highly resistive to shear and loading. Spectro Oils Of America.
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Old 02-09-2018, 10:39 PM   #12
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I run that redline you speak of. Works for me
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Old 02-09-2018, 11:10 PM   #13
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Default Re: again.. gearbox oil

The topic of oil is an age old discussion. I once sat thru a Royal Purple presentation and after hearing their pitch couldn't understand why I had ever run anything else through my engines.
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Old 02-10-2018, 09:29 AM   #14
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Default Re: again.. gearbox oil

80/90 because it is what was available back in the day.


COMING SOON; Which spark plug is best???


These have been discussed to death. And in the end, in another 50 years, there will probably be a oil store, that specializes in gear oil. Nothing else.

To me, the new stuff is redesigning the mouse trap. Plus, you can only charge so much, for a gear oil, that has been around since oil fields were first started.


And I am sure, if I live much longer, this subject will come up another million times. And all the answers will be more of a personal(I have used this forever and no problems), than a technical one(EPZ3 will eat aluminum, and the oxides will melt the steel parts).

Sorry, I had a extra dose of sarcasm in my vitamins this week, and some seems to be leaking from my fingers.
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Old 02-10-2018, 10:22 AM   #15
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Default Re: again.. gearbox oil

As Wizzbang K.C. explained well. I say ditto.
From Red Lines site, check page 2, 2nd paragraph.
https://www.redlineoil.com/Content/f...ech%20Info.pdf
I use dino oil and I use 90w but the manual does call for motor oil.
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Old 02-10-2018, 10:50 AM   #16
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Default Re: again.. gearbox oil

Quote:
Originally Posted by richbob View Post
Itís a bit more difficult getting straight grade oils in Europe unless you mail order or are lucky with a classic bike shop(premium price)
Do the HD dealerships there sell straight 50 or 60? They have it on the shelf here. Thanks for info.
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Old 02-10-2018, 12:34 PM   #17
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Default Re: again.. gearbox oil

I think the HD dealerships here only sell brand new bikes..... have never even been inside one.

I'm going to go for the 80/90
this topic was more to check if what I have been using is just too thick... and it's expensive too! 80/90 is cheaper
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Old 02-10-2018, 01:44 PM   #18
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Iíve never been in a dealership either but dealers in some places in Europe werenít here until the 80s spain Italy Portugal etc
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Old 02-11-2018, 12:54 PM   #19
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Default Re: again.. gearbox oil

Shovithead wins best answer!

Extra sarchasm leaking from finger tips.

Perfect!
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Old 02-21-2018, 12:43 PM   #20
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Default Re: again.. gearbox oil

Quote:
Originally Posted by JAWS View Post
Shovithead wins best answer!

Extra sarchasm leaking from finger tips.

Perfect!
I only say this, because it has been my experience, after years of new products coming out, each one, better than the last.

I rebuilt my 73 tranny in 1980, when I completely rebuilt the bike. Been through two bottom ends, and uncountable topends. Trans is still shifting like warm butter. To me, the key is maintenance and oil changes. But, I am sure this conversation will be repeated over and over, but the results will always be the same. 8 dollar a quart dino oil(80-90,85-145, or any of the other weights), which is in every auto/bike store, versus 28 dollar high pressure tofu oil, that has zero dino oil. I am not cheap, but I am reasonable. But when a trans last 38 years, and a quarter million miles(or somewhere close to that), it says something about the product I used.

But then, I am a old curmudgeon that is set in his ways, and I try to NOT use the newer technical oils(yup, no synthetics here in anything) for any of my old bikes, and I have a few to prove my theorys.

In the end, THIS, is MY opinion. If you want to run redline 440, or sardine oil from Canada, it is fine with me.
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