The MOST useful engine oil for EVO

[lanevo6]

I m using Liqui Moly 10w60... So far so gd:proud::proud:

60 very thick la Yap. if long distance and track ok lah.

 

[vspec]

I'm using torco 10w40. So far so good.

 

[yihao88]

60 very thick la Yap. if long distance and track ok lah.

Reli?? Too thick is a burden for the engine??

 

[lanevo6]

Reli?? Too thick is a burden for the engine??

not burden or cannot use. Just that when the oil is too thick it's a bit heavy/sluggish or slower to respond. Try change to 40 and see if you can feel the diff......if not then u can stick with 50 or 60

 

[yihao88]

not burden or cannot use. Just that when the oil is too thick it's a bit heavy/sluggish or slower to respond. Try change to 40 and see if you can feel the diff......if not then u can stick with 50 or 60

Cannot, u r my taiko mah... I must hear ur word:proud::proud:

I want to feel whether thr is reli a different...

 

[huakenny]

Reli?? Too thick is a burden for the engine??

slightly bad response/fuel consumption as told....its for track use for use....

 

[lanuncyber]

just want to share great info with ya guys. hope dis will end the myth of gearbox oil for our Es...

There has been much discussion and debate in the past few years over the use of GL5 Gear Oil in the Sportster Primary/Tranny. This debate centers around warnings that GL5 Gear Oil is corrosive and that it can damage what are known a "yellow" metal parts. Unlike the Big Twins, our Sportsters have a shared primary/tranny and that means that the stator (copper) and clutch spring plate (brass rivets) can be damaged if a corrosive lubricant is used in our application.

The question over the safety of GL5 has been hard to nail down because many of the manufactures will give out conflicting information depending on who you talk to, even within the same company.

WHY is this such a hard question for the oil companies to answer with factual data and WHY is it so hard to find a real answer to the question? The answer is really pretty simple.

Anyone who has spent time studying oil knows about the myriad of various ratings that are applicable for any particular lubricant, from JASO, CF, MIL, etc. The number of different tests that can be done on oil run well into the hundreds, so oil testing by the manufacturer is typically limited to those tests that are applicable to the oils intended use.

So why is it so difficult to get answers to the GL5 corrosive question? It's rather quite simple. Because GL5 is made for use in hypoid gearboxes which by nature don't contain yellow metals, so most manufactures don't perform the standard ASTM D-130 corrosive test on GL5 lubricants.

After quite a bit of digging, it turns out that spAmsoil has actually done ASTM D-130 testing on a number of common/popular GL-5 Gear Oils.

ASTM D-130 ratings fall on a scale going from 1A (least corrosive) to 4C (most corrosive) From a corrosive standpoint, an oil with a 1A or 1B rating is considered safe.

ASTM D-130 ASTM D-4048 FTM-5309 "Detection of Copper Corrosion from Petroleum Products by the Copper Strip Tarnish Test"
A variety of hydrocarbon products including oils, hydraulic fluids, fuel, solvents, etc., can be tested for corrosivity to copper by use of this test. It is limited to products with Ried Vapor pressure no greater than 18 psi (124 kPa). A polished copper strip is immersed in the fluid and heated for a specified time and temperature after which the corrosion is rated by visual comparison to the ASTM Copper Strip Corrosion Standards. The most typical test run is for 24 hours @ 100°C. However, time and temperature can vary according to product type and specification. Results are reported as a number followed by a letter according to the following scheme:

1a slight tarnish a light orange, almost the same as a freshly polished strip
1b dark orange
2a moderate tarnish a claret red
2b lavender
2c multi colored with lavender blue or silver, or both, overlaid on claret red
2d silvery
2e brassy or gold
3a dark tarnish a magenta overcast on brassy strip
3b multi colored with red and green showing (peacock), but no gray
4a corrosion a transparent black, dark gray or brown with peacock green barley showing
4b graphite or lusterless black
4c glossy or jet black

(The ASTM Copper Strip Corrosion Standard is a color reproduction of strips which have the above description.)

The following is the latest product list I could find that has undergone ASTM D-130 testing.

Amsoil M/T Fluid MTF..5W-30.............. 1A Light Orange
Red Line MT-90.......75W-90 GL4......... 1A Light Orange
Amsoil Long Life FGR 75W-90 GL5......... 1B Dark Orange
Amsoil Severe Gr SVG 75W-90 GL5....... 1B Dark Orange
Amsoil MT & Gear MTG 75W-90 GL4...... 1B Dark Orange
Mobil 1 Synthetic....75W-90 GL5......... 1B Dark Orange
Castrol Hypoy C......80W-90 GL5......... 1B Dark Orange
Castrol SYNTEC.......75W-90 GL5........ 1B Dark Orange
Citgo Citgear Std XD 75W-90 GL4........ 1B Dark Orange
GM Synthetic Axle....75W-90 GL5........ 1B Dark Orange
Pennzoil Gearplus....80W-90 GL5.......... 1B Dark Orange
Pennzoil Synthetic...75W-90 GL5......... 1B Dark Orange
Red Line NS Gear Oil 75W-90 GL5......... 1B Dark Orange
Red Line 75W90 GL-5..75W-90 GL5....... 1B Dark Orange
Torco SGO Syn G LS....75W-90 GL5...... 1B Dark Orange
Valvoline High Perf..80W-90 GL5........... 1B Dark Orange
Valvoline SynPower...75W-90 GL5......... 1B Dark Orange

Delo Gear Lubric ESI 80W-90 GL5.......... 2A Claret Red
Delo Trans Fluid ESI 50W..................... 2A Claret Red

Royal Purple MaxGear 75W-90 GL5......... 4A Trans Black
Mopar Syn LS additive..75W-90 GL5....... 4A Trans Black
Lucas 75/90 Synthetic75W-90 GL5......... 4B Graphite Blk

credit to: GL5 Gear Oil - Is It Safe To Use In the Sporty? - ANSWERED - Harley Davidson Forums

more info on: http://www.oilteksolutions.com/GearLubeWhitePaper.pdf