Oil Turned to Sludge! What’s Killing the Ford Transit 2.2 TDCi Engine. • Today we’re working on a Ford Transit with a 2.2 TDCi diesel engine. The van came in for a regular service — oil and filter replacement, plus a quick inspection of the suspension. But during the oil change, something immediately caught my attention: the oil filter was completely collapsed, as if the engine had sucked it in from the inside. • This happens when the lubrication system is clogged or when the oil becomes too thi