Since the end of last summer, I have noticed that my 1984 300SD running on SVO has lost power on Hills. I now have to go in the truck lane on hills. I have not seen a great loss in acceleration off the line, but that was never great. I do not see much of a difference between running on SVO or standard diesel. Standard Diesel seems to give me marginally better performance. Gleaning though the threads I have seen a number of suggestions:

I have already done the following:
1. Replace Fuel Filters
2. Replace Fuel Lines
3. Replaced Filter screen in Original Main tank.

I still have the problem. I am looking to try the following:

1. Clean Banjo fitting
2. Run a diesel purge
3. Adjust ALDA - from the other discussions this may not be related to Power on hill progblems.
4. Adjust valves.
5. Adjust timing chain.

Any other suggestions.

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1984 300 SD running SVO