You need to consult:
* Your engine's owner's manual: This is the definitive source. Look for a section on maintenance or lubrication.
* The oil fill cap: Sometimes the recommended weight is printed on the oil fill cap itself.
* The engine's data plate: This plate, often found on the engine block, may list the recommended oil weight.
Using the wrong oil weight can severely damage your engine. Don't rely on general advice; always check your engine's documentation.
