Thread: Toymota diesel probs

Toyota diesels have always had a sludging problem in varying degrees depending on fuel quality and usage. The problem appears to stem from a combustion chamber that is less than efficient! poor combustion=soot. This soot is deposited on the combustion chamber walls in the micropores created by honing which gives the rings sealing, which also appears hit and miss with quality in toyota diesels. A fuction of the oil is to wash the cylinder walls of this "soot" and disperse it in the oil, thence to the filter. Soot is carbon and causes wear at great rates, think a zillion micro diamonds! O_O
This is why our TD5's and TDi's can do 20 and 10tho services and have clean oil, efficient combustion, among other design enhancements ! Direct injection will always be cleaner than indirect but it appears toymota has skimped on injector sealing quality which is adding another rock into the shoe!

Cheers Scott
ps, my 300tdi has done 335k and still clean change to change and never been touched! Jinxed it now

It is the centrifugal filter that helps the TD5 as well.
The oil will often look clean for around 3k after an oil change,unbelievable for a diesel.

Pity they dropped them on the D3/4 engines.