Yep, those cylinders rust very easily. Very little chrome on them. I've seen good cylinders last many years in a very hostile environment without rust. Heck, I looked at the new Montana's here, and the cylinder were already rusted.
We had our LR/DR slide cylinder replaced under warranty. I actually did the install myself due to the poor quality of work I saw at the stealership. Corrosion X HD or grease works well to prevent the rust.
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