3.0 LITRE TD PATROL-OILS

Had an interesting conversation with a Castrol rep re engine failures on early 3.0 litres (gu model).
Apparently truck manufacturers often reduce the sump capacity to an acceptable minimum to lower service costs.
This is a marketing ploy,ours cost less to service than theirs etc.
In the case of the 3 litre,which is a renault truck engine,the sump was to small for the operating conditions and fuel quality in australia.
The lower capacity allowed soot concentration to build up to damaging levels leading to high engine wear and sometimes failure.
The recall in 2000 increased the sump capacity by 2.5 litres,providing more dispersant volume to handle our dirty fuel (compared to european standards).
Some where else on this site it was suggested that 10,000 changes was ok for the updated engine,castrol say that that is not correct and 5,000 changes are required to remove soot accumulation and ensure long engine life.
Castrol recommend their product RX super for this vehicle.
Regards