![]() ![]() Whether you have a motorhome or a towable RV, 75W140 gear oil ensures reliable lubrication and protection for the differential and other components, especially when towing or driving in mountainous terrain. RVs often have heavy drivetrains due to their size and weight. The higher viscosity and enhanced film strength help withstand the stress from aggressive driving and more horsepower. ![]() High-performance vehicles, such as sports cars and luxury cars with powerful engines, can benefit from the added protection from the 75W140 gear oil. Serious activities can pressure the drivetrain, requiring gear oils with high load-carrying capacity and exceptional protection.ħ5W140 gear oil is generally recommended for trucks and SUVs in these scenarios, as it offers superior resistance to extreme pressure and heat. Trucks and SUVs are often used for towing, hauling heavy loads, and off-roading. Thicker viscosity may result in increased dragĪpplication Suitability, Which is Right for You?Ĭhoosing between 75W90 and 75W140 gear oils depends on your specific vehicle and its conditions.75W-140 delivers better pressure protection and is more durable, meaning you don’t have to change it too frequently. The 75W-90 gear oil frequently needs to be changed due to the oil’s low viscosity, which can thin the oil’s film quicker. Generally, 75W140 gear oil tends to be slightly more expensive than 75W90 by about $10 – $15 per gallon, due to its higher viscosity and advanced formulation. The cost of 75W90 and 75W140 gear oils varies depending on the brand, quality, and quantity. The thicker the oil, the more internal friction will occur in the gear system.ħ5W-90 gear oils have lower viscosity and less thickness, reducing friction in transmitting power which is better for fuel efficiency. The higher viscosity of 75W-140 Oil can impact the fuel’s efficiency because of the oil’s thickness. Temperatureħ5W1-140 gear oils are more suitable for high temperatures because of the thickness of the oil made for heavily used engines.ħ5W-90 gear oils have lower viscosity, and the oil can flow faster and remain fluid at lower temperatures. 75W-90 gear oils tend to handle milder or tamer-used cars and are common in numerous vehicles. Extreme pressure performanceħ5W1-140 gear oils have the highest viscosity for a “75” rating and are designed to handle heavy-duty vehicles due to their more aggressive performances, such as carrying hefty loads where the vehicle is experiencing extreme pressure.ħ5W-90 gear oils have lower viscosity, meaning the oil is thinner and can flow faster. ![]() So, between gear oil 90 vs 140, the higher the number, the thicker the oil, and gear oils with a “75” viscosity rating, 75W140, is the thickest gear oil. The number 90 symbolizes a thinner oil compared to 140, indicating the oil’s resistance to flow. The main difference between 75W90 and 75W140 is their viscosity ratings. However, their performance characteristics differ due to their varying viscosities. These gear oils use synthetic base oils or a combination of synthetic and mineral base oils, offering enhanced lubrication properties, more suitable thermal stability, and improved resistance to oxidation. Their viscosity is the same when at low temperatures, as indicated in “75W”.ħ5W90 and 75W140 gear oils provide excellent lubrication and protect the drivetrain’s gears, bearings, and other components.
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