What to do with 10 liters Heinz BBQ sauce?
'Expiration' dates on anything that's not baby formula aren't.  They're 'best used by' or 'sell by', but many restaurants will get rid of it for liability issues. 

Although it should be good for many months past that date, it'd be better stored refrigerated, and I suspect most people don't have the fridge space for that sort of thing.

What I'd recommend is finding a soup kitchen or similar near you and donating it.  They could slow cook chicken or pork  in it for a very easy meal, or even glaze and grill it.  If any of the churches near you do big dinners as fund raisers, that's another possibility.