How often to change oil/filters in '2000 Freightliner FLD with Cat C12

Put an oil bypass on it like OPS to keep your oil clean and do regular oil samples and change it when it needs it not by some made up milage. Or if you want to just do it every 15-20k and you should be good.

 

In front of filter is a cap, uses a half in ratchet to remove, the buy a cat bypass, 1w-8845 is filter is memory serves correct

 

The oil filter housing has on the engine has provision for bypass that's just capped off, remove cap and install this filter. It is a cat bypass filter designed for engine

 

Every 20000kms or 12500 miles

 

I personally go by hours. Last oil change I was at almost 800hrs. I don't have a bypass filter but I use oil analysis. I've got a C15 btw.

 

Ditto what everyone else is saying . Take a oil sample. But regardless of the oil sample replace the oil filter every 10,000 miles. Or take oil samples of whatever oil your using every 250 engine hours and send it to the lab. Run it til they say it's bad.