All shredders require periodic oiling in order to help remove dust and buildup on the blades which can otherwise lead to jamming or other mechanical problems.
If you're looking for a large shredder, make sure that the bin has plenty of space too or you will end up emptying it more often than you'd like.
Cross-cut shredders provide higher security, but are generally more expensive and often need more maintenance than a strip-cut shredder.
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