75w90 gear oil vs 80w90

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Differences Between Gear Oil Weight? (75W-90 | 75W-140)

Remember Me? Results 1 to 7 of 7. It lists no other recommended weights. The rotary cutter manual gives you a chart showing the temperature range of a whole bunch of different weight gear oils. Obviously the a 75w90 gives you a greater range than the 80w I was going to buy some amsoil 75w90 for my pick up differentials - Is there any reason I cant use the 75w90 instead of the 80w90 in the tractor to keep it simpler?

Reply With Quote. Re: help me understand 80w90 vs 75w Originally Posted by thatguy. The manual for my JD calls for 80w90 in the front axle. Re: help me understand 80w90 vs 75w90 Use the 75w It's like using 0w30 engine oil instead of 5w The 0w is better.

The natural gardener God's original intent. Re: help me understand 80w90 vs 75w90 The first number 75 represents the viscosity of the oil at cold temperatures and the second 90 represents the viscosity at warm temeperatures.

The first number is calculated differently than the second number and that's why the first number isn't higher. The second number is what the viscosity will be when the tractor is warmed up most of the time it's being usedtherefore it's crucial that the last number is The first number being lower 75 rather than 80 is better yet because it will flow and lubricate before the tractor is warmed up.

It can be confusing and even sounds backwards but that's the way it is. The chemists that decided on these measuring systems just thaught it would be funny to confuse the rest of us. Re: help me understand 80w90 vs 75w90 fyi snippet from a GM Technical Bulletins. That's the main difference and as far as using one in place of the other it's not a problem as long as it's the correct spec.ISO oil grades are identified by their viscosity grade or VG.

SAE grade equivalents to ISO grades are approximate, since they are based on viscosity measurements at different temperatures. Gear oil grades can also change with time due to viscosity changes that occur with usage. Gear oil lubricates gears in cars and industrial motor gear boxes. Look for indications that the oil is multi-grade. Refer to the SAE grade marked on the container label.

75w90 gear oil vs 80w90

SAE grades identified by a number and then letter are multi-grade oils. Identify whether the oil is intended for use in crank cases or to lubricate gears. Measure the viscosity with a viscometer if the conditions are far from the original test conditions on which the SAE or ISO grades are determined. You can verify extremely hot and cold temperatures with a thermometer.

Extreme temperatures can result in very different viscosity than is standard for the grade. Gear oil grades can also change with time due to chemical changes that occur with usage. Directly measure the viscosity to determine the correct ISO grade in either of these cases. Convert the measured viscosity to the ISO viscosity to determine the correct grade.

SAE oil viscosity measurements are in Centipoise, abbreviated to cP. ISO viscosity grades are measured in centistokes, abbreviated as cST and measured in millimeters squared per second. Fortunately, Centipoise and Centistokes have a one-to-one ratio. This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.

To submit your questions or ideas, or to simply learn more about It Still Works, contact us. Step 1 Look for indications that the oil is multi-grade. Step 2 Identify whether the oil is intended for use in crank cases or to lubricate gears. Step 3 Measure the viscosity with a viscometer if the conditions are far from the original test conditions on which the SAE or ISO grades are determined.

Viscosity variation within ISO oil grades is plus or minus 10 percent. Items you will need SAE grade marked on the container label viscometer thermometer.

Pirro, A. Wessol, J. About the Author This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.Forums New posts Search forums. What's New New posts. Members Registered members Current visitors. Site Rules. Log in Register. Search titles only. Search Advanced search…. New posts. Search forums. Log in. JavaScript is disabled. For a better experience, please enable JavaScript in your browser before proceeding.

Using 80w gear lube instead of 75w in rear diff. Thread starter Midwestspecial Start date Jan 23, Midwestspecial New Member. I ended up changing the rear diff with regular valvolin 80w fluid instead of the synthetic 75w Is this going to be a proble? Old fluid was pretty dirty and probably had never been changed before. Wyle Well-Known Member.

Define "problem". The different grade probably won't be a big deal, but I doubt the conventional lube will hold up as well as a synthetic as specified in the Owners Manual. The big unknown is now the service interval with conventional 80w?! I'd go back to the the auto parts store with receipt and Owners Manual in hand and insist that they correct the mistake.

Worst they can do is say no. If it were me, I'd keep gear lube on my shopping list and find a nice spring afternoon to crawl back under there for an hour. Cheap peace of mind for knowing it should go another k miles, IMHO. Wooluf Well-Known Member.

75w90 gear oil vs 80w90

For the there is nothing listed about changing the fluid at any set time or mileage. Just check and add as needed. Many members go with the 50k miles. Especially the off-roaders. The 80w shouldn't be a problem, but it should be synthetic. Haven't noticed anything. Bartonmd Well-Known Member. There will be very slightly more windage losses for lack of a better term from the heavier fluid, but from it not being synthetic, you'll have pretty good losses before it warms up, especially in the winter I know I put regular dino gear oil in my Cummins, and when it's really cold out, I can push in the clutch and put the thing in neutral, coasting, and I slow down MUCH faster than when everything's warmed up Not the case in the TB, with the synthetic I don't do any offroading and am planning on changing it again after 30K miles anway.Forum Rules.

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Forgot your Password? Sign Up. Remember Me? Results 1 to 5 of 5. Is 80W90 the same? I don't see straight 90 anywhere. Any brands better than others? Reply With Quote. Pick whatever brand you like. Use it when SAE 90 is specified. Originally Posted by sqdqo. Please don't use anything but gear oil, like 80W in a gearbox or axle that specifies it. Gear oils have viscosities similar to engine, hydraulic, and power train oils but those oils do not have the EP Extreme Pressure additives found in gear oil.

Some gears have sliding contact or extremely high contact pressures and gear lubes have additives containing chlorine, sulfur, or phosphorous phosphates that make it work.

Conversely, some of these EP additives will erode clutch packs - power train or hydraulic oils are used in those applications.

Hydraulic, power train and engine oils have anti-wear additives that are good for low pressures but they can't compare with EP additives. Along with 80W, there are alternatives that probable weren't available when your machine was built like 75W synthetic, 85W and 80W that will suit your need. My predecessor made the mistake of specifying a gear oil in an axle with bronze faced friction disks got the brake and I had to write a multi-million dollar program to replace all the brakes and fill with a synthetic.

Likewise he also specified a hydraulic oil where a gear oil was needed and as a resulted in wiping out several hundred limited slip differentials that needed the EP additive. Replies: 6 Last Post:PM. Replies: 3 Last Post:PM. Replies: 5 Last Post:PM. By Anonymous Poster in forum Yanmar.

Replies: 3 Last Post:AM. All times are GMT Gear oil is used to keep gears running smoothly. It protects the gears from wear down, corrosion, oxidation and rust. Gear oil is available in various weights. Applications differ by weight. An oil's use can be determined by the SAE number or grade it is assigned. Numbers of 60 and higher indicate gear oil while lower numbers indicate engine oil.

This means 75W and 80W are both gear oil. The 75W gear oil is used under extreme pressure conditions and is recommended for limited-slip differentials and for use in colder climates. Used in heavy duty manual transmissions, final drives and axles, high temperatures will not effect the heavy film left by this oil.

The 80W gear oil can be used in extreme pressure conditions and as a lubricant for non-synchronized manual transmissions in heavy duty trucks or buses. This gear oil is recommended for conventional and limited slip differentials. This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information.

To submit your questions or ideas, or to simply learn more about It Still Works, contact us. About the Author This article was written by the It Still Works team, copy edited and fact checked through a multi-point auditing system, in efforts to ensure our readers only receive the best information. Photo Credits gear device image by Pali A from Fotolia.Many of our customers often wonder what the differences are between our 75W90 and 75W gear oil kits, so we at LMR have provided an in-depth look at all of the detailed aspects.

Depending on the climate where the customer lives can highly determine the overall thickness of the oil at freezing and at degrees. We put these kits together with oils that can really work on both sides and not have issues in most cases. For example, if you take the ring and pinion kitswe include the 75W To break it down further the first number refers to the maximum temp at which the gear oil will reachCP centipoise.

Centipoise is a measurement of dynamic viscosity that is measured in the centimeter gram second CGS system of units. This is a multiple of the CGS base viscosity unit that is named poise P. Gear oils are normally tested around degrees Celsius. The second half of each number, whether it be the 90 or simply refers to the viscosity at degrees Fahrenheit.

Check out our other article for more information on the breakdown of the different Mustang Fluid Capacities! The first number refers to a cold-weather viscosity. The lower this number is, the less viscous your oil will be at low temps. Lastly, the second half of each number refers to hot weather viscosity how fluid your oil is at hot temps. Basically, the higher the number is, the thicker the oil is at a specified temp. Check out our YouTube channel for even more tech tips, installation videos, how-tos, and more.

The best place to go for anything Mustang related! Checkout our current Sales! We are currently shipping packages and orders at full capacity with no delays.

What Is the Difference Between 75W90 & 80W90 Gear Oil?

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Share this article! Breakdown Of What The Numbers Mean To break it down further the first number refers to the maximum temp at which the gear oil will reachCP centipoise. Conclusion The first number refers to a cold-weather viscosity. We at LMR hope that this in-depth breakdown will better help you in making your decision about which type of oil best suits your needs. LubeLocker 8. LubeLocker 7. Published on In this installment of LMR Basics, check out the simple steps required to change the rear end gear oil in your Mustang.

Whether you're changing rear end gears or doing routine maintenance, this video will show you the general procedure on changing the rear end oil in your Mustang. Shop LMR. Landan with Late Model Restoration. Every once in a while the rear end in your Mustang needs servicing. It plays a vital role in vehicle performance because after all its job is to transfer power from the engine to the rear wheels.

This task is very simple, and often overlooked by many because of the intimidations from rear end components. Before changing the rear end gear oil in your Mustang you are going to need a few supplies to get the job done. You will need a lift or jack and jack stands, a socket set, flat head screwdriver quality brake clean, rags or shop towels, a putty knife or gasket scraper, a quality liquid gasket product or one of our Lube Locker reusable gaskets, a drain bucket, the correct rear end gear oil weight and friction modifier, and lastly; a clear tube to transfer the fresh gear oil into the housing.

SAE to ISO Gear Oil Conversion

The alternative to this is to purchase a transfer pump from your local auto parts store.Is this correct? Can I safely replace 75W with 75W? Our answer: Yes, 75W gear oil can most definitely be replaced by 75W Oil Depot Blog. We can only speculate on why GM specifies 75W for some vehicles. Here are our theories. To boost mileage.

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Auto manufacturers have to meet government-mandated fuel economy standards across their product lines. These fines can be in the tens of millions of dollars. You may not notice the fraction of a mile-per-gallon improvement because of the thinner oil in your diff. But the automaker bean counters do and they are banking on every trick in the book to boost collective fuel economy. A 75W GL-5 gear oil is relatively rare. Therefore, consumers will feel that the safe choice to go back to the dealer for service.

Again, we know for a fact that some GM dealers simply use 75W anyway. Very close viscosity. Most diffs were designed with 75W in mind. Going to 75W was a fuel-economy-boosting endeavor. It can replace any of these with no worries or risk. No fuel economy penalty. There will not be a measurable loss of fuel economy by going with this slightly thicker oil.

World-class wear control. Severe Gear 75W is formulated to provide elite wear protection.

Fix Notchy gearbox 75w90 vs 75w80 GL4 vs GL5 Toyota Yaris 2007 XP90 hard shift transmission.

It is designed to withstand high horsepower, heavy loads and extreme heat or cold. Reasonable cost. What About Limited-Slip Additives? Marc Roden Independent Dealer info oildepot. Follow us on Facebook.

75w90 gear oil vs 80w90

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