I will get my new Alto VXR inshallah this week. Please tell me about the running of this car. i mean what should be the top speed for what time. I heard that don't go more than 80kph for 1000 Kilometres, Is this correct..... Please guide me.?
many tks for such clarification much clear now, just one concern i heard once u use fully synthatic oil than cant switch back to minral oil or semi synthatic oil.
pls advise this
I dont think its true.
You can switch to any good mineral or semi synthetic with current API like SL, SM or SN any time.
There might be a temporary issue while switching to synthetic after running mineral for a long time with out following proper oil change interva . It is because synthetic contains strong detergent and cleaning agents which will break down any carbon deposits on the piston and cylinder region. This will make the new oil loose its colour and will clog up the oil filter in few days. Piston deposits removed by the new oil also makes way for some combustion pressure to leak out of the chamber or in some cases oil reduction issue may arise.
The issue is understanding the SAE 5W-20, what does this mean
SAE defines standard for motor oil viscosity grade
Viscosity of oil is its ability to flow at a specific temperature. The higher the viscosity longer it will take it to flow at a certain temperature simply saying it is thicker or heavier. Lower viscosity oil will flow quicker at specific temperature simply thinner or lighter.
5W-20 means that it has multigrade viscosity within a specific temperature range. Simply saying it has characteristic of more than one oil.
W means winter or cold i.e 0 F (-18c)
5W means it will give optimum protection in cold starting and cold running even at sub zero climate as it will circulate through the engine quicker.
20 defines the oil dynamic viscosity at high sheer rate (150C). 20 being very low will not provides optimum protection against engine wear at 40+ C weather and stop and go city traffic. It may give fuel economy (2% max) but may also cause oil pressure drops at higher rpms causing metal to metal contact ( 30% reduction in engines service life ) which I am sure you dont want.