Is it normal for my coolant level to be about a half a gallon too low? I've got 22,000 miles on my Cayenne S. Today I got the Check Coolant Level light so I stopped and checked it and it was loowwww. I bought the prediluted antifreeze and started adding. I filled it up to right under the Max and used about a half a gallon.

 

Has anybody had to add a significant amount of coolant?

 

Seen this numerous time, not unusual to add that amount, about normal for a "20K Service", given the 22,000 miles.