Oil For D4 3L V6

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Originally Posted by DieselLSE

If there's a D4 you're interested in, the very first thing to do is an oil pressure test. The old-fashioned way: with a pressure gauge. If it is slightly down on spec, then the bearings will be worn and the motor is on its way to destruction.

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My view is that the interval between any oil pressure reduction due to bearing wear and shells grabbing then rotating is extremely short because the bearings do not have a wear layer, instead a thin, hard coating which once breached exposes the soft aluminium backing. If there is any reason to remove the body then remove the engine and replace all bearings with tri-metal versions which have 2 wear layers on top of the aluminium.