ACDelco DEX-COOL Extended Life Antifreeze/Coolant

Yes. ACDelco is GM's own OEM parts brand. Part number 12346290 is the genuine GM DEX-COOL concentrate -- the same fluid used in GM dealership coolant services. Manufactured by Prestone Products Corporation for General Motors.

Yes. The product label and Amazon listing confirm a bittering agent is included (typically denatonium benzoate at trace concentrations). This makes the coolant taste unpleasant to deter accidental ingestion -- but it does not eliminate the toxicity. Ethylene glycol is harmful if swallowed and carries a Prop 65 reproductive harm warning. Keep secured from pets and children.

DEX-COOL is GM's OAT coolant specification covering GM passenger cars and light trucks that specify DEX-COOL in the owner's manual. The label confirms ASTM D3306 (automotive) and D4985 (heavy-duty diesel). Do not use in vehicles requiring a different spec (e.g., European Si-OAT or Asian OAT formulations) without confirming compatibility.

The label states 5 years or 150,000 miles. No independent used-coolant analysis for this specific ACDelco-branded SKU exists to confirm that interval in field conditions. The OAT inhibitor chemistry (carboxylate-based, silicate-free) is consistent with extended-life claims.

The back label carries a Prop 65 reproductive harm warning. Ethylene glycol (CAS 107-21-1) is on the California Prop 65 list for reproductive toxicity. The SDS also carries an H361 classification (suspected of damaging the unborn child, Cat 2). The SDS §15 states no Prop 65 warning is required for consumer packages -- the back label is authoritative.