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@GA2G
I don't know about OnGuard specifically, but some locks are better designed than others, especially regarding weather-proofing. Kryptonite have a great reputation in this respect, whereas others need more care, and in some cases, regular applications of graphite grease.
http://www.maplin.co.uk/graphite-lock-lubricant-444745
http://demonpowerproducts.co.uk/product_info.php/hudy-106210-graphite-grease-p-4106