80W-90 vs 85W-140 Gear oil: Which one should you use?
Choosing the right gear oil is important for protecting your vehicle's gearbox,
differential and rear axle from unnecessary wear. Whether you drive a pickup, truck, bus or passenger car in
Bangladesh, the correct lubricant helps keep your gears running smoothly under daily driving conditions.
When comparing 80W-90 vs 85W-140 gear oil, the biggest difference is viscosity. SAE 80W-90
is thinner at operating temperature, while SAE 85W-140 offers a thicker oil film for gear systems that
require it.
Both grades serve different applications, from regular road use to demanding commercial vehicle operations.
But thicker oil doesn't always mean better protection. Your vehicle's gear design, operating load and
manufacturer's recommendations matter more. So, which gear oil should you
choose? The one that matches your vehicle's required SAE grade and performance specification, helping you
protect critical gear components and avoid costly maintenance problems.
In this guide, we'll explain the key differences between 80W-90 and 85W-140 gear oil, their API GL-5
specifications, differential and transmission applications and what to check before buying gear oil in
Bangladesh.
What is the difference between 80W-90 and 85W-140 gear oil?
The main difference between 80W-90 and 85W-140 gear oil is their viscosity, especially when the gears
reach operating temperature. SAE 80W-90 gear oil flows more easily at lower temperatures, while
SAE 85W-140 gear oil stays thicker when hot. Both grades can serve differentials, axles and
compatible gear systems, but the right choice depends on the vehicle manufacturer's specifications, load and
operating conditions.
Comparison factor
80W-90 Gear oil
85W-140 Gear oil
SAE Viscosity Grade
Multigrade SAE 80W-90
Multigrade SAE 85W-140
Oil Thickness
Thinner at operating temperature
Thicker at operating temperature
Low-Temperature Flow
Better low-temperature flow characteristics
More resistant to flow at low temperatures
Viscosity at 100°C
Lower, within the SAE 90 range
Higher, within the SAE 140 range
Oil Film
Forms a thinner lubricating film under comparable conditions
Can maintain a thicker lubricating film under comparable conditions
Load Conditions
Used in gear systems specified for this viscosity
Used in gear systems requiring higher operating-temperature viscosity
Differential Oil Applications
Suitable for differentials requiring SAE 80W-90
Suitable for differentials requiring SAE 85W-140
Transmission Gear Oil
Suitable for compatible manual transmissions
Suitable only for transmissions that specify or permit this grade
API GL-5 Rating
Available in API GL-5 formulations
Available in API GL-5 formulations
Common Vehicle Applications
Specified axle and gear systems in cars, pickups and commercial vehicles
Specified axle and gear systems in trucks, buses and other vehicles
What do SAE 80W-90 and SAE 85W-140 mean?
SAE grades tell you how gear oil viscosity behaves at low temperatures and when the gears get hot.
The Society of Automotive Engineers (SAE) uses these numbers to classify
automotive gear oils based on their viscosity.
SAE 80W-90
SAE 80W-90 gear oil is a multi-grade lubricant for use in differentials, axles and
compatible manual transmissions. The 80W is the low temperature viscosity rating and the
90 is the viscosity range at 100C. It has a lower operating-temperature viscosity than SAE
85W-140 and is suitable for gear systems specified by the manufacturer for this grade.
SAE 85W-140
SAE 85W-140 gear oil is a thicker multi-grade lubricant used in some heavy-duty
axles, differentials and gear systems. The 85W tells us about its low-temperature viscosity
rating, and 140 tells us the oil still has higher viscosity at 100°C. It can provide a thicker
oil film under heavy loads, but only use this grade if it is recommended or allowed by the equipment
manufacturer.
80W-90 vs 85W-140 Gear oil: Technical viscosity comparison
The main difference between 80W-90 and 85W-140 gear oils is how thick each oil stays at different
temperatures. These grades are defined by SAE J306 viscosity standards so that you know how they will
flow and how well they are suited for differentials, axles and compatible transmissions.
Technical parameter
80W-90 Gear oil
85W-140 Gear oil
SAE Viscosity Grade
SAE 80W-90
SAE 85W-140
Kinematic Viscosity at 100°C
13.5 to less than 18.5 cSt
24.0 to less than 32.5 cSt
Viscosity at 40°C
Generally lower; exact value depends on the formulation
Generally higher; exact value depends on the formulation
Low-Temperature Test
Must meet the 80W viscosity limit at -26°C
Must meet the 85W viscosity limit at -12°C
Low-Temperature Viscosity Limit
Maximum 150,000 cP at -26°C
Maximum 150,000 cP at -12°C
Viscosity Index
Varies by product formulation
Varies by product formulation
Pour Point
Depends on the specific oil formulation
Depends on the specific oil formulation
Oil Film Thickness
Generally forms a thinner oil film at the same operating temperature
Can form a thicker oil film under comparable conditions
API GL-5 Compatibility
Available in API GL-5 formulations for compatible gear systems
Available in API GL-5 formulations for compatible gear systems
Recommended Application
Differentials, axles and gear systems specifying SAE 80W-90
Heavy-duty axles, differentials and gear systems specifying SAE 85W-140
Where should you use SAE 80W-90 gear oil?
SAE 80W-90 gear oil is commonly used in differentials, rear axles and compatible manual gearboxes
where the manufacturer specifies this viscosity grade. It offers lower operating-temperature viscosity than
85W-140, making it suitable for many passenger cars, pickups, light trucks and commercial vehicle gear
systems. For heavily loaded hypoid gears, an API GL-5 80W-90 differential oil can provide
extreme-pressure protection, but always check the vehicle manual before use.
When should you use SAE 85W-140 gear oil?
SAE 85W-140 gear oil is suitable for heavy-duty differentials, rear axles and gear systems where the
manufacturer specifies a higher-viscosity lubricant. It maintains a thicker oil film at operating
temperatures, helping protect heavily loaded gears in compatible trucks, buses and commercial vehicles. An
API GL-5 85W-140 differential oil provides extreme-pressure protection for suitable hypoid gears, but
heavy loads or hot weather alone do not justify switching from the recommended grade.
80W-90 vs 85W-140: Which is better for differential and transmission use?
Choosing between 80W-90 and 85W-140 gear oil depends on whether you need it for a differential, rear
axle or manual transmission. Both grades can protect gears under load, but their viscosity and compatibility
differ. Always check the vehicle manufacturer's recommended grade before changing the oil.
Comparison factor
80W-90 Gear oil
85W-140 Gear oil
Differential Oil
Suitable for differentials that specify SAE 80W-90.
Suitable for differentials that require thicker SAE 85W-140 oil.
Manual Transmission
Works in compatible manual gearboxes that specify this viscosity and oil type.
Used only in manual gearboxes that specifically allow this heavier grade.
Rear Axle Applications
Commonly used in passenger cars, pickups and commercial vehicle axles where specified.
Used in certain heavy-duty truck, bus and industrial vehicle axles where specified.
Gear Protection
Provides a lower-viscosity oil film at operating temperature.
Can maintain a thicker oil film under similar operating conditions.
Flows less easily when cold and may increase resistance during startup.
API GL-5 Compatibility
Available as API GL-5 gear oil for compatible hypoid differentials and gear systems.
Also available in API GL-5 formulations for specified high-load gear applications.
Transmission Synchronizers
Must match the gearbox's GL-4, GL-5 or other specified lubricant requirements.
Requires the same compatibility checks. Higher viscosity may also affect shifting.
What does API GL-5 mean for 80W-90 and 85W-140 gear oil?
API GL-5 is a performance classification for gear oils used in heavily loaded gears, especially the
hypoid gears in vehicle differentials and drive axles. Manufacturers can meet
API GL-5 requirements with 80W-90 or 85W-140 gear oil by using the right additive formulation.
API GL-5 gear oil generally contains extreme-pressure (EP) additives to reduce gear
tooth wear and to protect the metal surfaces when sliding contact occurs under high load. But GL-5 does not
determine oil thickness or guarantee suitability for every manual transmission. Always refer to the vehicle
manufacturer's recommended SAE viscosity grade
and lubricant specification.
How to choose the right gear oil for your vehicle in Bangladesh
Selecting the right gear oil in Bangladesh depends on your vehicle type, gearbox design and
daily driving conditions. 80W-90 and 85W-140 gear oil are different in viscosity characteristics and using
the wrong grade can affect the performance of the gears. Check these 6 important factors before buying the
differential oil and transmission gear oil.
Check your vehicle manufacturer's recommended SAE grade
Verify the correct API gear oil performance rating
Identify your differential or manual transmission type
Consider vehicle load and daily driving conditions
Check operating temperature and gear oil viscosity
Choose the correct gear oil specification and pack size
KMS Lubrica (BD) Ltd SAE 80W-90 and 85W-140 Gear Oil in Bangladesh
KMS Lubrica (BD) Ltd supplies SAE 80W-90 and SAE 85W-140 gear oil for compatible automotive
transmission and gear systems across Bangladesh. Both grades meet API GL-5 requirements and contain
sulfur-phosphorus extreme-pressure (EP) additives to help protect gears under heavy loads. The company
offers 1L, 4L, 20L and 205L packs for vehicle owners, workshops, transport companies and fleet operators.
Lubrica EP SAE 80W-90 gear oil
Lubrica EP SAE 80W-90 is an API GL-5 gear oil for compatible differentials, axles and
manual gear systems that require this viscosity grade. It has a tested viscosity of 17 cSt at 100°C,
making it thinner at operating temperature than SAE 85W-140. Its EP additives help reduce gear wear
under load, while the formulation also helps control rust and foaming during operation.
Lubrica MFT SAE 85W-140 gear oil
Lubrica MFT SAE 85W-140 is a high viscosity API GL-5 gear oil for gear systems of heavy
duty gear systems demanding this grade. It is tested at 30 cSt @ 100C and has EP additives to protect
gear teeth under high pressure and load. This 85W-140 differential and transmission gear oil is
compatible with gear assemblies where the manufacturer calls for a thicker lubricant.
Final verdict: Should you choose 80W-90 or 85W-140 gear oil?
The correct choice between 80W-90 and 85W-140 gear oil depends on your vehicle’s gearbox,
differential design and manufacturer recommendations. If your vehicle requires a lower-viscosity lubricant
for its differential, rear axle or compatible manual transmission, use SAE 80W-90 gear oil. Use
SAE 85W-140 gear oil when the manufacturer recommends a thicker lubricant for heavy-duty gear systems
and high-load applications.
Both grades are available as API GL-5 gear oil, offering extreme-pressure protection for all suitable
hypoid gears and differential assemblies. Check the recommended SAE grade and performance specification
before changing the differential oil or transmission gear oil. Thicker oil isn’t always the better
choice.
Why choose KMS Lubrica (BD) Ltd for 80W-90 and 85W-140 gear oil in Bangladesh?
KMS Lubrica (BD) Ltd is a trusted gear oil manufacturer and supplier in Bangladesh, offering
lubricants for automotive and commercial vehicle
applications. The company has operated its local oil blending plant since 2017 and uses laboratory
testing to check product quality. Customers can buy SAE 80W-90 and SAE 85W-140 gear oil in different pack
sizes, whether they need oil for one vehicle, a workshop or an entire transport fleet.
We own a lubricant blending plant in Bangladesh, which provides us with total control over the formulation
of oil, production & quality checks.
Lubrica EP 80W-90 and Lubrica MFT 85W-140 meet the API GL-5 specifications and are recommended for use in
compatible automotive gear systems.
Our EP gear oils contain sulphur-phosphorus additives that protect gear teeth from wear under high
pressure and load.
We determine important properties of oils such as kinematic viscosity, viscosity index, pour point and
flash point using ASTM methods.
Buy 80W-90 and 85W-140 gear oil in Bangladesh from KMS Lubrica (BD) Ltd
Looking for the right gear oil for your vehicle, workshop or transport fleet? KMS Lubrica (BD) Ltd
supplies SAE 80W-90 and SAE 85W-140 gear oil for compatible differentials, rear axles and automotive gear
systems. Our API GL-5 gear oils contain extreme-pressure additives to help protect gears under heavy loads,
with 1L, 4L, 20L and 205L packs available for different buying needs.
Call us at 01950-066692 today to discuss your gear oil
requirements, check the right viscosity grade and request a quotation for retail or bulk supply.
It can be confusing when one vehicle uses one viscosity grade of gear oil , and another vehicle uses another
. So do you use 80W-90 or 85W-140 ? Here are some common questions regarding differential oil, transmission
gear oil, API ratings and selecting the right lubricant in Bangladesh.
Can I use 85W-140 gear oil instead of 80W-90?
You should only use 85W-140 gear oil in place of 80W-90 if your vehicle manufacturer approves it. SAE
85W-140 is thicker when hot and may increase resistance in gear systems designed for thinner oil.
Switch grades according to the vehicle manual.
Which gear oil is better for truck and bus differentials?
Depending upon the axle manufacturer’s requirements, the gear oil used in truck and bus differentials
may be either SAE 80W-90 or SAE 85W-140. Some heavy-duty axles take a higher viscosity oil; some take
80W-90 or another grade. Match the recommended API performance rating and SAE viscosity.
Can I use API GL-5 gear oil in a manual transmission?
Yes, but only if API GL-5 gear oil is specified or allowed by the gearbox manufacturer. Some synchro
manual transmissions require GL-4 or other lubricants with different friction characteristics.
Incorrect transmission oil can affect gear shifting and synchronizer operation.
Is 85W-140 gear oil better for Bangladesh's hot weather?
Not always. Bangladesh is hot, but that doesn't mean every differential or gearbox needs SAE 85W-140
gear oil. Many vehicles use 80W-90 or other recommended grades. Follow the viscosity requirements of
the manufacturer, not just the outside temperature of the oil.
গিয়ার অয়েল কতদিন পর পরিবর্তন করা উচিত?
গিয়ার অয়েল পরিবর্তনের সময় নির্ভর করে গাড়ির মডেল, ব্যবহারের ধরন এবং প্রস্তুতকারকের নির্ধারিত
রক্ষণাবেক্ষণ সূচির ওপর। ভারী মালামাল বহনকারী ট্রাক বা কঠিন পরিস্থিতিতে চলাচলকারী গাড়ির গিয়ার অয়েল
তুলনামূলক কম সময়ের ব্যবধানে পরিবর্তন করতে হতে পারে। তাই গাড়ির ম্যানুয়াল অনুযায়ী নির্ধারিত সময়ে
তেল পরিবর্তন করুন এবং নিয়মিত তেল লিকেজ বা দূষণের লক্ষণ পরীক্ষা করুন।
ভারী লোডের ক্ষেত্রে 85W-140 গিয়ার অয়েল কি বেশি সুরক্ষা দেয়?
SAE 85W-140 গিয়ার অয়েল উচ্চ তাপমাত্রায় তুলনামূলক ঘন থাকে এবং গিয়ারের ওপর একটি পুরু লুব্রিকেটিং
ফিল্ম তৈরি করতে পারে। যেসব গিয়ার সিস্টেমে বেশি ঘনত্বের তেল ব্যবহারের নির্দেশনা রয়েছে, সেখানে এটি
ভারী লোডের সময় ভালো সুরক্ষা দিতে পারে। তবে শুধু তেল ঘন হলেই বেশি সুরক্ষা পাওয়া যায় না। গিয়ারের
নকশা, এক্সট্রিম প্রেসার (EP) অ্যাডিটিভস এবং গাড়ি প্রস্তুতকারকের নির্ধারিত স্পেসিফিকেশনও গুরুত্বপূর্ণ।
Choose the Right Gear Oil
Find the right 80W-90 or 85W-140 gear oil for your vehicle with trusted quality and specifications.
High-quality gear oil supplier in Bangladesh for automotive and industrial use. Reliable performance, long-lasting protection, and consistent supply across the country.
Explore Gear Oils
