QUOTE(diadokmai @ Jun 7 2010, 10:02 AM)
guys..will u explain to me 10W40 means what..
if im not mistake..my car use 15W50 i think...(not really remember la..but the number "5" i still remember)
what does it means..? which is better?
and..anybody can suggest me the good tint for a car..
i plan to change my current tinted..
wanna change to more better one..Vcool or Aircool mayb.
10W40 or 10W50 means the viscosity of the engine oil, viscosity in simple terms is the thickness of the oil. the 'W' is the viscosity of the oil in 'winter' conditions, so in theory the oil is thin when cold as in winter cold. The lower the number the thinner the oil.
The W rating actually doesn't apply at all in Malaysia where there is no winter at all.
40/50 is the viscosity when the oil is hot and also means it's thicker, around 100C where a normal engine operates. This is where you have to pay attention, inside the manual there is a table showing the oil viscosity MINIMUM for a certain ambient temperature. In this case 40/50 is sufficient, too thin and there will be metal to metal contact.
These oils are called multi-viscosity oils, which actually aren't needed, you can use single viscosity oils that only have a 40/50 rating.
There is no better or worse only the CORRECT one, 40/50 both of which are correct will ensure your engine gets sufficient protection.