Oil useage?

Pete, I just had an oil change at 22,250m on my DD60, 14L, 980K miles. We just sent if off a few days ago, and I'm hoping to get some good factual information from it. Are you thinking of sending in an oil sample? I guess it's a pretty useful tool. I don't really know what "6" of blowby" means, can you give me a hint? Thx

 

Blowby is a reading of the pressure in the crankcase, the higher the reading, the more combustion that the piston rings are allowing to pass into the crankcase. 6 inH20 is about the high side of the spec on that I do believe.

 

An overhead adjustment would be a good idea if you do not know much about the history of the engine. Should be done every 100k miles or so. Unfortunately if you have a high blowby reading, a "valve set" wont help. It means the piston rings are worn. I would run it for a while and see how much oil you are actually using. There are plenty of trucks that burn 1-2 gals of oil in between changes (10-15,000 miles)

 

There's a thread on here BLOW BUY ?? That explained how its measured. I dont think Doing a valve set will help with blow buy issues. Where did you get your oil change done?

 

Some times the valve stem seals wear and allow oil down in to the piston.

 

If you can CK oil when eng. is stone cold each time it will be easer to keep track of oil use, Your truck seems to use oil about normal, if you turn up idle to 9 or800rpm while its just sitting running A/C it may use less oil because its doing some work at hi idle not just letting oil pass thru rings at low idle.