On Monday, I mentioned the gauge on the side of the air filter box on our truck, and how the owner’s manual says to trust the gauge.
The manual clearly states that you should never replace the filter - never even open the box to visually inspect the filter - until the indicator reaches the red.
As I mentioned in my earlier post, I had reached the point at which I no longer trusted the gauge, and it turns out my fears were justified.
Here’s what the old filter looked like when I took it out:
It is too soon to tell how much my mileage has improved, but acceleration/responsiveness has jumped now that the engine is no longer starving for air.
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