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There are ways of lubing a bearing that are appropriate for different bearings. I'd ask the supplier of the bearing just how best to lube that bearing. Since some suppliers are quite vocal about not lubing bearings of certain designs/materials in certain ways, I'd investigate those reasonings too.
Just oiling the bearing you have could be a waste of time if the bearing is already pitted. And since you can't know that without removing the bearing, while you are there why not replace?
I find it odd that roller bearings aren't used in other places in the engines. And wouldn't a bearing with more surface area provide more inertia and friction thus slowing the engine?
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