Although a vehicle that is recommended to use a 30 weight
oil can also use a 40 weight oil, it is usually not needed.
You will gain absolutely no benefit from using a thicker
viscosity oil if it is not needed. The only time we
recommend a 40 weight oil, such as AMSOIL's 10W-40, to a
customer in a passenger car or light truck application is if
the vehicle's engine is excessively worn and consumes oil
at a higher than normal rate or if the vehicle is being used
for very severe duty, high load, high temperature applications.
http://members.cox.net/synthetic-motor- ... weight.htm
[分享]EOS 機油黏度選擇建議
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