That sucks!!!
I agree with putting some dummy tanks out and laugh when those get stolen.
I know one shop owner who thought one of his guys was stealing some of his engine oil in bottles. He took a few new ones, cracked them open and dumped the metal shavings from the break lathe in. It didn't take long for him to figure out which employee it was. One of the mechanics came in complaining about how his engine started knocking and locked up on him. Customers cars always got new bottles from another area of the shop so he knew they wouldn't get the laced oil.
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