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No secret sauce, what has happened is you have some excess coolant caked on the threads of the cap thus making it stiff.
If its pressure that's built up in the system and you are worried, the bottom right corner has a plastic screw you can turn to vent the system.
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North American Mr12Volt Carplay/Android Auto Distributor
INSTAGRAM: GORDON.M3
DINAN | EVOSPORT | VAC | ARP | RD SPORT | NEEZ | EIBACH | CSF | IND | BILSTEIN | KLASSEN | BREMBO | ENDLESS | BBS | BPM SPORT | PROJECT MU | EVENTURI
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