A
75W-90 will be thinner at higher oil temperatures than a 75W-140
. Both are the same thickness at lower oil temperatures. The 75W-140 is said to have a wider viscosity range – when more accurately it would be a wider temperature range.
Is Thicker gear oil better?
Higher viscosity provides a thicker film
, higher wear resistance, and less deformation of the gears as time goes on. Low viscosity oils, on the other hand, are best for high speed systems with lower load. They provide a thinner film and better cooling to match the higher speed of the gearbox in question.
What is the difference between 75W90 and 75W140?
So, the difference between “75W90” and “75W140” is that at operating temperature,
the 75W140 will be considerably thicker than the 75W90
but at room temperature they will be about the same viscosity.
Can I use 75W140 instead of 75w85?
New Member. If you tow a lot, the
75w-140
is what you would use. For towing only once in a while go with the 75w-90.
What is 75W-140 gear oil used for?
SAE 75W-140, API GL-5 is typically used as
service fill rear axle oil
for many passenger cars and trucks with high loads or very high horsepower. The higher viscosity base stocks help protect gears by maintaining the oil film in addition to the extreme pressure agents used to reduce metal to metal wear.
Which is the best gear oil?
- #1. Quicksilver 802851Q02 High Performance SAE 90 Gear Lube. …
- #2. Valvoline High Performance SAE 80W-90 Gear Oil 1 GA. …
- #3. Lucas Oil LUC10043 Oil SAE 80W-90 Heavy Duty Gear Oil – 1 Quart. …
- #4. Red Line (50304) MT-90 75W-90 GL-4 Manual Transmission and Transaxle Lubricant – 1 Quart. …
- #5. …
- #6. …
- #7. …
- #8.
When should I use 140 gear oil?
Application. Gear Oil 140 is designed for use in
differentials
, both hypoid and limited slip, in passenger cars, light commercials, 4WDs, trucks, construction, earth moving and agricultural equipment where such a viscosity grade is required.
Is synthetic gear oil better?
Synthetic lubricants have a
lower friction coefficient in a gearbox
, better film strength and a better relationship between viscosity and temperature (viscosity index, VI). This indicates synthetic lubricants can be used at lower viscosity grades and lower temperatures.
Can you use 80w90 instead of SAE 90?
Yes it is the same… close enough anyway. SAE 90 gear oil is equivalent to
50wt
engine oil (SAE 80 = 30wt), so you could always dump that in instead if you want.
Which gear oil is thicker 80W 90 or 85W 140?
Which gear oil is thicker, 80W 90 or 85W 140? – Quora. Short answer:
85W140 is thicker
.
Is 75W90 better than 80W90?
75W90 is synthetic and mostly superior to 80W90
, but it costs more. 75W90 has better low temperature viscosity and it is fine to run it throughout. If you’re in a place that does not get very cold, there will be little advantage running 75W90 and in theory, 80W90 may even be more shear stable.
Can I use 75w85 instead of 75W90?
Our answer: Yes, 75W-85 gear oil can most definitely be replaced by
75W-90
.
Can you mix 75W90 and 80W90?
You are fine to mix the two I’d think. No weird additives, just basic Castrol 75w90.
Can I use 75w140 instead of 75w90?
Can I use 75w140 instead of 80w90?
Either one is fine
. Generally the synthetic 75w-140 is for HD applications such as towing, but it will work fine in any application.
How do I know if I have a limited slip diff?
The easiest way to tell if you have an open differential is to jack up the car and spin one of the rear tires. If the other wheel spins in the opposite direction, you have an open differential.
If it spins in the same direction
, you have a limited slip differential, or LSD.
Does Mobil 1 gear oil have friction modifier?
Mobil 1 Synthetic Gear Lube 75W-140 LS contains
special friction modifiers designed for limited slip type differentials
. In most applications, the addition of special LS (limited slip) additives is not required.
