I don't advise messing with the ALDA. If you meant cleaning the ALDA boost plastic line between the manifold, switchover and ALDA, by all means. The ALDA was factory set and better to not mess with it.

However, it should not affect the starting of the engine but it affects the performance of the engine.

Its not unusual to have difficult starts in the winter especially with very high mileage D's. You can help it along by following the suggestions mentioned above by the other members, such as putting in lighter weight oil. I'd start with that b4 messing with compression testing. Simple stuff first

Oh, BTW, does "grease-car" mean a WVO conversion?

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