Don’t degrade engine oil if manufacurer recommends 10w-50 don;t go for 20w-50 you may go for 5w-50 no prbolem for cold starts.
upgrading engine oil like 10w30 to 10w50 (10w40 may not makes any trouble in lubrication).
Main thing is: engine operating temparature lets say 100c in summber due to weather conditions its almost reach very short span of time.
Oil gets thinnger by temparature,
A point to remember: 75% of the engine wear comes from cold starts. It pays to choose your oil wisely.
Engine Oil upgrading conditions
your vehicle has reached a higher mileage and experiences increased wear and tear, requiring better lubrication and protection provided by a synthetic oil; driving conditions and engine type however, always consult your vehicle manufacturer’s recommendations
Severe driving conditions like frequent stop-and-go traffic, towing heavy loads, or extreme temperatures can necessitate a higher quality oil
Engine Oil upgrading problems thicker (dynamic thicker) multigrade vs monograde
1. Cold Start Problems due to chnage lower number w
- Thicker Oil in Cold Temperatures: High-viscosity oil becomes even thicker in cold weather, leading to sluggish engine starts.
- Delayed Lubrication: The oil takes longer to flow through the engine, which increases wear on moving parts during startup.
if manufacurer recommends 10w-50 don;t go for 20w-50 you may go for 5w-50 no prbolem for cold starts.
2. Increased Engine Wear
- Poor Flow at High Viscosity: The oil might not reach critical areas quickly enough, causing increased friction and wear.
- Reduced Hydraulic Performance: In hydraulic lifters or variable valve timing systems, thicker oil can impair operation, leading to noise and poor performance.
3. Reduced Fuel Efficiency
- Higher Internal Resistance: High-viscosity oil creates more drag on the engine’s moving parts, which increases fuel consumption.
4. Overheating
- Inadequate Heat Transfer: Thick oil can hinder the engine’s ability to dissipate heat, leading to higher operating temperatures and potential damage.
5. Stress on Oil Pump
- Strain on Oil Pump: The oil pump has to work harder to circulate high-viscosity oil, which could lead to premature pump failure.
if oil pump broken no oil circulation in the engine leading to engine seize.
6. Sludge and Deposits
- Inability to Remove Contaminants: High-viscosity oil may struggle to suspend contaminants effectively, increasing sludge formation and deposits.
7. Warranty Issues
- Manufacturer Recommendations Ignored: Using an oil grade outside the manufacturer’s specifications can void the warranty.
When is High-Viscosity Oil Suitable?
- High Mileage Engines: Older engines with worn parts may benefit from thicker oil to maintain proper sealing and reduce oil consumption.
- High Temperatures: Engines operating in extremely hot climates may require higher viscosity oil to maintain performance and prevent thinning.
How to Avoid Problems
- Always use the oil grade recommended in your vehicle’s owner’s manual.
- Adjust the oil grade only if an expert mechanic suggests it for specific reasons, such as the engine’s condition or environment.
Engine oil HTHS (High Temperature High Shear) Test 150 c chart
HTHS measures the viscosity (resistance to flow) of an engine lubricant at elevated temperatures under constant shear.
Low HTHS oils: the art of balancing fuel efficiency and engine protection
- A lubricant with low HTHS viscosity improves fuel efficiency.
- A lubricant with high HTHS viscosity offers better protection for engine parts.
- The engine type: Low HTHS oil in an engine designed for high HTHS oil can cause damage.
HTHS test 10w50 oil chart
The Valvoline SynPower specification sheet below, has a viscosity of 9.4 centistokes at 100c. Which neatly demonstrates a precisely blended oil.
Kinematic viscosity is measured in centistokes cSt (or mm2/s).
What it measures
The HTHS test measures a lubricant’s viscosity, or resistance to flow, at 150°C and a shear rate of 1,000,000 s-1. These conditions simulate the high speeds and narrow tolerances between moving parts in a hot engine.
What it indicates
A lower HTHS number indicates lower resistance to flow and better anticipated fuel efficiency.
How it’s used
The HTHS test measures how well a lubricant can run efficiently between the narrow openings of fast-moving engine parts, such as the piston ring and lining, valve train, and gearwheel contact points.
multigrade and monograde engine oil
monograde engine oils do not suffer from shear as there are no viscosity index improvers in the oil.
A multigrade oil gives you the best of both worlds by maintaining its performance at high and low temperatures.
viscosity index improvers and viscocity chart graphical representation showing how the viscosity of a fluid changes with temperature
kinematic viscosity
measures how quickly an engine oil flows when force is applied to it. (calculated by dividing a fluid’s dynamic viscosity by its density) It’s a key indicator of oil quality and is used to determine an oil’s SAE viscosity grade: kinematic viscosity measured in square meters per second (m²/s) or centistokes (cSt) which is equivalent to square millimeters per second (mm²/s)
high shear high temp 150c : HTHS viscosity is measured in milliPascal seconds (mPa·s)
low hths (lower viscosity at high temperatures) vs high hths (higher viscosity at high temperatures).
The higher this number, the better the engine protection performance.
winter grades
Summer viscocity grade
The 60 grade on the SAE J300 table has a with a whopping 21.9 to 26.1 centistokes at 100°C viscosity – and a rather thick HTHS viscosity of 3.7 centipoise at 150°C.
Compare this a 0W-8 weighing in at between 4 and 6.1 centistokes at 100°C and a HTHS viscosity of a super thin and fuel saving of potentially a minimum of 1.7 centipoise.
Technical Specifications :
| SAE Grade | 10W-30 |
| Viscosity @ 100ºC, cSt (ASTM D445) | 10.1 |
| Viscosity, @ 40ºC, cSt (ASTM D445) | 63.2 |
| Viscosity Index | 146 |
| Sulfated Ash, wt% (ASTM D874) | 0.8 |
| HTHS Viscosity, mPa•s @ 150ºC (ASTM D4683) | 3.0 |
| Pour Point, ºC (ASTM D97) | -42 |
| Flash Point, ºC (ASTM D92) | 232 |
| Density @15.6 ºC, g/ml (ASTM D 4052) | 0.859 |
Bike overheating in Traffic & stopped air cooled enngine
if its liquid cooled then check cooling system like expired coolant 2-4 years flush. pump, thermostat radiator fan etc.
here air coolege 125cc bike no temparature gauge.
Turn off the engine: Shut off the engine to prevent further heat buildup.
Let it cool down: Wait for the bike to cool down before attempting to diagnose the issue
upgrading better idea becuase its overheating after 4-12hours running in traffic.
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