Abu2 wrote:sementara blm ada update ttg pertanyaan ane di atas, ane tanya lagi ya, dgn quote dari lapaknya datsu
Turboman wrote:datsu wrote:
@buatandi: bedanya antara GL-4 sama GL-5 apa sii oom? setau gw mobil2 standar GL-5 kaya mobil gw (di buku harus 75w-90) kalo dikasih GL-4 umur olinya lebih pendek yaa?
Beda kandungan EP additive-nya
Utk gardan mutlak pakai GL-5
Utk transmisi manual idealnya GL-4 walau ada bbrp trans yg mengijinkan penggunaan GL-5
om turbo, ane pake spek Motul hdx technosynthese SAE 80-90 GL5 mil.l2105D untuk gardan dan transmisi manual (suzuki GV 2007).
dulu awalnya pake SGO (oli bawaan beres), setelah ganti Motul ini, jauh lebih enak , dan masuknya ces pleng..
tapi kira2 aman gak ya Om? karena di buku manual spek untuk transmisi pake oli GL4 SAE 75-90
Dari API (American Petroleum Institute), silakan diterjemahkan sendiri ya....
What does API GL mean?
API stands for American Petroleum Industry and GL stands for Gear Lubricant, see below for
their definitions:
API GL-1 Straight mineral oil
API GL-2 Mild EP for worm gears
API GL-3 Mild EP for spur and spiral bevel gears in axles and transmissions
API GL-4 Medium EP, MIL-L-2105 quality, moderate severity hypoid gears, manual transmissions
API GL-5 High EP, MIL-L-2105D quality, all hypoid axles, some manual transmissions
API GL-6 Extra high EP, now obsolete
Beberapa FAQ tentang gear oil, terjemahkan sendiri lagi....
Is it important to select the right API GL rating?
Yes. Selecting the correct gear oil performance level will provide the best protection to the components of the transmission.
What do the SAE grades mean?
SAE stands for the Society of Automotive Engineers. The SAE classification system is a way of
defining how thin or how thick an oil is. This is known as an oil’s viscosity. The classifications
are listed here in order of increasing thickness: SAE 75W, SAE 80W, SAE 85W, SAE 90, SAE
140, SAE 250.
What does EP mean?
EP means extreme pressure and refers to the additive used in gear oils. This additive is
designed to stop metal-to-metal contact taking place between transmission components. The
EP additives are usually based on sulphur and phosphorous. These elements bond to the
metal surfaces where there are points of extreme pressure and temperature, forming a
sacrificial chemical layer. The sulphur gives gear oils their characteristic smell.
Will synthetic gear oils and mineral gear oils mix together?
Yes, but beware that there two kinds of synthetic gear available: polyalphaolefin (PAO) based
and polyalkylene glycol (PAG) based. PAOs are basically a man made version of mineral oils
(although with greatly improved properties) and can therefore be mixed with mineral oils. In
fact, semi-synthetic products have mineral and synthetic base fluids in them, so obviously,
they must be able to mix. PAGs, on the other hand, will not mix with PAOs or mineral oil.
Utmost care must be taken when using this kind of product.
What is a hypoid axle?
Hypoid is an abbreviation for hypocycloidal and relates to the geometry of the crown wheel
and pinion arrangement usually on rear wheel drive cars. The pinion is usually highly offset to
reduce propshaft intrusion into the passenger compartment.
Do I need a special oil for limited slip differentials?
Yes. When the power distribution between two drive shafts is no longer equal (usually due to
the surface condition that the drive wheels are turning on, i.e. ice, mud), limited slip
differentials are able to effectively lock the two half shafts, ensuring equal power distribution
once again. When this limited slip differential mechanism ‘kicks in’ there is a high shock
loading on the clutch mechanism that requires protection from wear and slippage. Use of the
incorrect oil can lead to clutch degradation and vibration.
Why should I choose non-EP straight oils for my classic car?
Depending on the age, make and model non-EP gear oils may be required for use in
gearboxes and final drives. Certain designs contained a lot of phosphor-bronze (copper
containing) components that are sensitive particularly to the sulphur extreme pressure (EP)
additive. The sulphur attacks the copper and destroys the integrity of the meshing gear
surfaces.
Is it alright to use ATF in a manual gearbox?
Certain designs do specify the use of an ATF in manual gearboxes, but they should only be
used where it is clearly stated by the manufacturer.
Is there one gear oil that will meet all my requirements?
This will depend on makes and models, but very often the answer is no. Gearboxes, final
drives, transfer boxes, etc., all have their own specific lubrication requirements. The
specification of the oil required will be outlined by the design engineers, who will determine
which type of oil will provide the maximum protection to the transmission components. It may
certainly be possible to rationalise and reduce the number of lubricants used, but the magical
single product may not be achievable.
What is the difference between a gear oil, an atf and an mtf and why are they
sometimes interchangeable?
There is a fair amount of common ground, all do a basically similar job, an ATF could be
regarded as a low viscosity gear oil with more precisely controlled frictional properties.
What is an MTF and why is it used instead of a gear oil?
MTF ( manual transmission fluid ) is a term preferred by some OEMs, perhaps they think it's
more descriptive than "gear oil". It doesn't call up any particular performance or viscosity. For
example a Volvo MTF will not be the same as a Honda MTF.
How do gear oil, atf and mtf viscosities relate to engine oil viscosities?
Gear oils and engine oils are classified by 2 different viscosity grading systems. A 75W-90
gear oil, for example, is about the same viscosity as a 10W-40 engine oil. In theory ATFs and
MTFs can be any viscosity as required by the OEM. In practice ATFs are approx. the same
viscosity as a SAE 10 engine oil or a ISO 32 hydraulic oil. MTFs are about the same, possibly
slightly thicker.
What is a 75w gear oil as this is only a cold crank rating isn’t it?
The target here is 4.1 cSt minimum @ 100 deg. C + the low temp target. If the gear oil in
question is, for example, a 75W-80 it must meet both specs which is effectively the 75W low
temp + the high temp targets of both specs.; 4.1 cSt minimum for the SAE 75W and 7.0 -
11.0 cSt for the SAE 80. You can see that the SAE 80 target " overlays" the SAE 75W target so
expect the KV 100 of a 75W-80 to be about 9 cSt.
Can one gear oil cover a number of viscosities like 75w-90, 80w-90 and 90 and why?
Yes it can, the viscosity grades are not mutually exclusive, it is possible to blend a gear oil
with multigrade characteristics such that it falls within, for example, the SAE 75W and the SAE
90 viscosity bands. A mulitgrade oil ( gear or otherwise ) is simply an oil which falls into more
than one viscosity grade.
Why do some synthetic gear oils cause poor shifting in older or high mileage boxes?
If this really happens it can be that the generally lower viscosity of a synthetic gear oil may
not suit an older or worn box.
Can engine oils be used in gearboxes if they are the right viscosity and are there
advantages to using them?
Engine oils can be used in certain gearboxes, in the past it was the norm to do just that.
Modern engine oils can be expected to attain the baseline API GL4 performance required for
gear protection. Viscosity is not likely to be an issue, the viscosity of a 10W-40 engine oil, for
instance, approximates to a 75W-90 in gear oil terms. The gear oil viscosity grade system
uses bigger numbers than the engine oil system but that doesn't mean the oils are thicker.
The advantages? The detergency and antiwear systems in engine oils may cope with excessive
"competition" temperatures better. Engine oils are intended for a shorter service life than
gear oils so one point to be aware of is the viscosity modifiers used in multigrade engine oils
may not be as shear stable as true gear oil VM’s so a bigger viscosity drop in service is
possible. If you are considering this, use a top quality shear stable engine oil, or talk to us
first.
Are filled for life gear oils a gimmick and are they in the long term bad for your
gearbox?
I wouldn't say they are a gimmick but they do assume "normal" service conditions. Having a
modified engine putting more power through the box & competition conditions don't lend
themselves to gentle gear changes so you may see higher wear rates and more wear debris in
circulation. It's logical to change the oil periodically if only to flush out the wear debris.
Of course the discerning owner may wish to change the oil occcasionally even if the service
conditions are considered to be less severe.
This may raise more questions than it answers but hopefully it is of use to some of you.
Regards
Guy
, makasih banyak meneerr 
