My 02 7.3L has a really bad burning Oil smell at startup until it warms up. Now I notice that it is using a lot of oil, no leaks. Recently had to replace a injector. The truck has good power, just a small amount of white smoke on start up not a lot. Any ideas on what this would be? 270,000 miles.

 

sounds like valve guide seals leaking...with that many miles on it, its possible ...scott

 

Could have another bad injector I would do a buzz test and see if any then sound week and a contribution test to see if the valve cover gaskets are working properly if a injector is weak it could be letting oil in to the cylinder mixed with the fuel allowing it to still run smooth

 

I had to take it to a shop, the problem at the moment seems to be a bad O ring, I think the guy who said he replaced an injector (#2), did not install a new injector. It was a used injector. With bad O rings. I'm having all the O rings replaced on both banks.
Hard to trust anyone now days.

 

Update: It was a cool morning here on Saturday when I started the truck. Not much smoke ( I replaced two Glow plugs last year)and the burning oil smell was gone. I will be driving the truck today to monitor the oil usage. I hoping this has been rectified.