Dear Mr. Ali,
First point , I was replying to Mr. Nasrum, and not to you, so I am not telling you to do something so just check your reply to me, your telling me to learn something etc ?
This is a forum and we are all free to give replies as per our intelligence, and no body can put a chain around any body's mouth to shut him up. According to you, anybody who wants to give a reply should do a phd on the subject?
The oil which i am using , has good effect on our engines, and they are not giving us any problems and run fine.
But its true that for a more complicated type of engines, you should use a high quality oil with GOOD VISCOSITY.By this I mean that even if you are using 5-20, then this oil should not deform under stress. it should have good viscosity according to its grade.
I have a toyota corolla 1.3 2008 VVT model and the last time i went to Toyota, they put in Techron 20-50 oil in it too, without my telling them to.
And please note that after about 2-5 minutes the oil heats up and then all that remains between your engines grinding parts is the "VISCOSITY", also described by some mechanics as CHIKNAI.
'The viscosity of a fluid is a measure of its **resistance to gradual deformation by shear stress or tensile stress'**
The shear stress are the moving parts inside the engine and as these parts move around inside the engine they actually deform the oil and decrease its lubrication properties over time.
And if you have been to Nathiagali while climbing from Abbotabad, you are mostly going in first gear with your accelerator pressed till the end, and these are the times when you need a very good viscosity oil with high value of resistance against shear stress
So when your engine is old you need to make sure that its moving parts inside the engine are not grinding against each other and so you have to provide proper lubrication to the engine,
But with complicated engines, use the recommended oils only, as they might have tight tolerances and just may need a lower viscosity oil.
Regards
