best engine oil for 125 cc bike Raider puslar n125 Duke hero xtreme 125r

 

subject	tvs raider 125 cc	bajaj n125	Duke 125 cc	hero xtreme 125r
Manfufacure recommed grade	tvstru4 10w30	Bajaj Premium 4T 10W30	10w50 motul 7100 fullysythtic in all ktm bikes upto 390cc	10W30 SL MA2
Oil type	fully synthetic		fully synthetic
service schedule in km	6ooo	5000	7500 kms	3000
service schedule days	6 months	6 months	5 months	3 months

 

Mineral vs Semi synthtic vs fully synthetic

features	Mineral	Semi synthtic	fully sytntic
	s are refined from crude oil	blends combine conventional and synthetic base oils	mproved cold flow, high-temperature stability, and premium wear protection.
drain interval km *approx	2000-2500	3000-4-000	5000-7500

What is 10w30 Means engine oil viscocity grade?

Engine Oil gets thicker on cold temparatures and thinner in Higher temparatures its called viscocity.

Low temperatures = Thicker

High temperatures = Thinner

in 10w50 means

w stands for winter or cold temparatures.  W oils are rated according to their flow rates at 0° F (-17.8° C).

10 Means viscocity of the engine oil in Cold temparature (when starting a cold engine).

50 means viscoity of the engine oil at bike engine operating temparature ex: 100c

or 2nd number viscosity measured at 100 degrees Celsius

0W is thinnest (“W” stands for winter)
5W
10W
15W
20W
25W
20
30
40
50
60 is thickest

For Example: 10W30

This means the viscosity is at 10W when the engine is cold and 30 when the engine is hot.

 

Upgrading 10w30 to 10w50

Thicker oil clearence in cranshfit brearings makes a drag in engine performance.(some percentage*)

Higher temparature makes oil thinner /less viscoity .. more than engine operatiing temparature 100c+

used 10w30 after 12 hours running in traffic clutch riding  missing /losing compression / stopping suddenly on low rpm.

Some people upgraded 10w30 to 10350 there is no noticeable damage but improved smoothness heat protection.

 

SAE Viscosity Rating Numbers

Know your bike Cooloing system? (Air vs oil vs liquid cool )

Engine Oil not alone cool down the engine but also other cooling systems

• 100 cc bike mostly Air cooled
• 125cc-200 AIr+Oil cooled
• 150-1000cc+ : Liquid cooled

engine oil grade based on outside temperature

The SAE system classifies engine oil viscosity grades like 5W-30. The first number denotes winter/cold flow grade – lower means easier pumping when cold. After the “W,” the second number reflects hot operating viscosity – higher indicates thicker oil that better retains film strength under heat.

engine oil relation with outside temperature

Viscosity index (VI): VI measures how much an oil’s viscosity changes with temperature.

viscosity index improvers: polymer imroves viscocity of the oil.

A 18°C temperature difference can cause a 71% drop in viscosity.

Winter cold or summer heat affects the rate at which motor oil flows.

 

 

engine oils there is also a specification that must be met at 150°C, known as a High Temperature/High Shear (HT/HS) viscosity

 

 

Mineral vs Semi synthtic vs fully synthetic

RPM & temperature of engine chart