Ask the Mechanic
Mon Jan 14, 2013 01:50 PM CST

Q: I have noticed the oil recommended for a new gas-fueled truck that I recently purchased is a lower viscosity than my older one. Why is the manufacturer now recommending thinner oil for my new truck? I pull heavy loads with my truck, and I am concerned thinner oil might not lubricate the engine as well as thicker oil.

A: You have a good point here. However, auto manufacturers are under extreme pressure from the federal government to increase the Corporate Average Fuel Economy (CAFE) of all the vehicles they produce. If they can’t do ...

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