Originally Posted by
wrinklearthur
Hi vnx205
A history of short running and the fact that, all motors breath to some extent or other, residue is deposited and condenses where the motor is coolest, for example; under the rocker cover and in the 300TDi, also inside the oil separator / breather.
After a time without it being cleaned out ,that residue can become a near solid grey-black crud.
Oil changes to get rid of combustion by produces, done on a regular, but short time base, helps keep those places in the motor, clear of build up.
In the case of any diesel, combustion by produces contain carbon particles and if oil changes are left for an extended times, this carbon finds its way onto the cylinder walls and causes a polishing effect called glazing.
Glazing is a common problem with diesel Farm Tractors, that are used for long periods doing light duties, such as the feeding out. When used for heavy ploughing the oil consumption is high until that motor settles down again with wear, this can take up to a week of heavy work before the oil consumption drops back to a reasonable level.
Cheers Arthur