Cat C-7 diesel oil viscosity
I have a 2004 Cat C-7 in a 36' Meridian which I have been using Rotella 15W-40 oil in it since new 68,000 miles back. Seems I remember reading somewhere the thought was that 10W-30 was better for the...
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My 3126-E gets 8.5 MPG which is the same all electronic engine as the C-7 (except) less emission controls. Very good engine!
