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CALLED GM CANADA, NEW NUMBER FOR 22-23 WILL NOT FIT 17-21, COULD BE THEY DIDN'T WANT TO GO INTO IT, OBVIOUSLY ENTIRE PAN ASSEMBLY WOULD ALSO NEED TO BE CHANGED AS WELL. BUT SIMPLE ANSWER WAS NO IT DOES NOT FIT ON YOUR 2019 ZL1. AS FOR WHY IT CHANGED UP I'M NOT SURE, COULD BE A SEAL WAS REDESIGNED OR SUPPLIER CONSTRAINTS OR MATERIALS.
I'M JUST GOING TO GO WITH THE KATECH UPGRADED PUMP IF MINE FAILS, I BABY MY CAR AND DO PROPER WARM UP BEFORE DRIVING IT. MOBIL 0W40 DEXOS R OIL AND CHEVRON 94 OCTANE FUEL (CONTAINS NO ETHANOL) AND I DON'T TRACK THE CAR.
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