Join Date: Aug 2008
Location: Western Canada
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If I may.
The screen is aparantly exactly as stated... a pre-filter. I think it is logical that it ONLY does its job at two specific times in the life of your engine. First, when the engine is started for the very first time where there may be filings in the sump that hasn't had a chance to go through the (much finer) oil filter. Second, the instant your engine blows up and you have bigger problems to worry about.
For the 200,000+ miles in between... I can't see how such a course filter would do anything at all.
Now, do the magnets? According to the manufacturer they absolutely do. I obviously can't personally back that claim as I have no data either way. I think logic would say it helps and certainly couldn't hurt.
To answer the Q about the screen directly: No, it does not come with a screen. Yes, your original screen can be re-fitted onto the magnet. However... the longer thread of the replacement plug makes it so it won't fit. So you'd either have to use some washers to make up the gap (not sure how well that would work) or you'd have to carefully trim the screen to account for the difference.
However I certainly didn't bother in my car. And when I had mine installed, it was by the dealership and they raised no question at all. There was no discussion about the screen or concern in the slightest. That was the first time I knew about the screen... when they handed my original back to me. I asked if that was important, and the service manager shrugged is shoulders and said simply, "not really".
Obviously it is up to the individual to decide. I can't monitor the forums constantly so if someone does come up with a factual determination (ie. some service manager somewhere says not to do it) then please, I'd appreciate if someone can give me a headsup. It is a new product at my store and it seemed like a good, or at least harmless, thing to try and by all logic it should help prolong your engine's life.