So, My parents travelled to Norway. They paid for car rental from Sixt using Chase Sapphire (provides primary car rental insurance).
At a certain point, my dad refuelled and accidently put in AdBlue in the gas tank, which is basically very very bad and might have led to total loss of engine or possibly car.
They refused the offered insurance from the rental place because they had colission from their credit card.
Would they be responsible for the whole car? or just the deductible? the deductible is 1000$, which is doable, but does it cover something like this?