At our local work on cars days over the years many oil changes have been done. Once in a while I have to use an 18" breaker bar to unscrew the filter cannister or the drain plug. I have seen cracked plastic oil filter wrenches over the years so that is why I use a cast aluminum one.
The plug is aluminum and the 8 mm recess for the 8 mm allen bit gets rounded. I carry around an extra new plug just in case. When you remove yours next year you might try a T50 torx bit. It is actually a better fit than an allen and does not round the recess like an allen can.
When we run into an issue like this I ask the owner: "who changed the oil and filter last time." It is almost always a local dealership.
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