While many things can cause this, the MOST common is aereated oil. One way to verify this diagnosys is to run the engine under LOAD until at operating temperature. Allow it to idle for a short time (15-20 seconds), shut it off then pull the dip-stick. If there are bubbles on the dipstick, CHANGE THE OIL.f_stahl said:Thanks, My truck runs rough at Idle, 300-1000 rpms.
only does it when it is up to operating temp, starts up fine, idles good when cold.
Which oils fit this criteria???John_G said:All PSD engines REQUIRE an oil with an API rating of "CI-4" or better. Sure, early engines could not use CI-4 because it did not exist, but they run LOTS better with it than with say "CG" oils.
There is no way to KNOW if an oil meets the criteria of "CI-4" without looking at the bottle. The "CI-4" rating is CLEARLY marked as part of the "API" symbol on the container.99StrokerDude said:Which oils fit this criteria???
No disrespect, but there is NO WAY I am going there......For that matter, what is the best oil to use in the 7.3???
Understandable, I suppose I should have just asked if the oil I was using is a very good oil... I usually use the Delo 400... I have had a couple people tell me it was good, but I would rather know if an expert Diesel Garager thought so...John_G said:No disrespect, but there is NO WAY I am going there......