inside cab smelling burn oil

[Rawze]

Don't rule out the tranny on the oil smell in the cab. I had another guy say he started smelling oil all the time,.. then found out his tranny was full of coolant because the heat exchanger in it was failing.

With the engine getting old, it could be many things.m 2250's and 2350's are notorious for the older style of valve guide seals going bad, gear lube or not. This would certainly make it burn a bit of oil.

When is the last time you replaced your crank case filter? -- On an old engine, they need replacing more and more ofter because of more and more blo-by. Most guys resort to drilling the element out to relieve the crank case pressure as the engine gets old. Excess crank case pressure can definitely damage turbochargers, make the seals on them leak, and even damage the air compressor and power steering pump face seal form what I hear. If you are getting oil seepage out of the engine brake harness on the drivers side of the engine, that is a sign of crank case pressure buildup.