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I think you're wasting your time and risking expensive pump damage unless you're very careful (with used motor oil). All the stories you hear about it being historically used for years are pretty much nonsense when put into the context of the 6.2 diesel. That because the 6.2 uses a distributor...

Timing advance getting sluggish? The ignition timing advance is usually the first thing to wear on the Stanadyne DB2 pumps. Not easy to check on a 6.2 since the pump is buried in the middle of the engine. It CAN be checked with a gas-engine timing light if you have the proper adapters...