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...
Forum Discussion
Tinkerer, how often do you change the oil in your C7? Doubt it's once a year. 30+ years ago because of oil sampling I learned many "RECOMMENDATIONS" are expensive BS.
