our oil flushes recommended by chrysler? on 2008 Chrysler Town & Country

We have our oil changed every 3-4K but the same service center. the last time they told us that the van needed an oil flush ($160) because the level was low and slug on the bottom of the dip stick.

I agree with joelburke26 and suggest asking friends for references to a different shop(my opinion). Also maybe some others will remark for or against Marvel Mystery Oil, but you can find that at parts stores or walmart --read directions on container-(again, my opinion).
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tell them no thanks on the $160 flush.used motor oil has better lubricating ability then the solvent which is what that engine flush consists of.just have the oil changed n all will be ok.