Air filter
Reminds me to check mine. It has been a long time.
I can remember early on with this rig, we escaped to high altitude to get away from Socal smoke for a few days.
When I started the rig to go home, really hard to start, loads of exhaust smoke.
Yup, needed a new filter, the altitude was the final straw.
My 02 has the Cat 330 and I'm very pleased overall. I drive for mileage and routinely saw 10 MPG towing a Prius. 32 K lbs. approx.
The Allison shifts to 6th gear right at 62 MPH. I get her in 6th and back off to 60, I'm at peak torque around 60-62 MPH, superb economy.
I have always run power service fuel treatment to boost cetane.
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