IMO, there are three achille's heels on the 13B. All three come with age but are easily fixed. I've experienced all of the following on my T2. I've fixed each problem area and now my T2 currently has over 200k on the engine.
#1 Engine Fire
-replace the fuel press regulator, pulsation dampener, and the rubber fuel lines on the engine. They tend to spontaneously leak when they get old.
#2 Clogged EGR Valve and Ports
-causes part throttle detonation which can pop an engine
-removed the EGR Valve and Lower Intake manifold. Clean all the EGR ports on the valve and manifold with pipe cleaning brushes and lots of carb cleaner. Be careful to not damage the plastic and rubber EGR valve components.
#3 Oil metering pump, lines, nozzles
-can cause excessive seal wear if not working correctly
-replace the oil metering hoses from the oil metering pump to the oil nozzles. They get brittle and can crack.
-make sure the oil metering pump is working and adjusted to supply the correct amount of oil to the combustion chamber.
-make sure none of the oil nozzles are clogged
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