My '82 300D turbo has been running great. Today I bought diesel fuel at a new (for me) location called Ultramar. Now the car clanks like a cold diesel engine at idle even when at operating temp. The tank is still full. It's been 10k miles since I changed the pre and main fuel filter and 7k since the valve adjustment. Any suggestions about what i should do and if I should wait till the tank is burnt off first. I'm due for an oil change (3K).

I have a few cans of diesel purge which i have yet to use.

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1972 450SL
1982 300D Turbo