Normal CPU Temps for Power Mac G5?

Hello All,
I just wanted to know, since Im very curious about my temperatures since Im really trying to avoid the Logic Board failure due to Lead-less solder. Ive installed heat sinks on my DDR-SDRAM cards (x4 1GB Apple OEM chips (they bear the Apple Logo and have " Memory Module" on the stickers) I got four of these heat sinks: http://www.newegg.com/Product/Product.aspx?Item=N82E16835110105 and they work extremely well, however I dont possess the required tools to remove the processors to apply Arctic Silver 5 Thermal Paste, and these processors have not been budged one bit since purchase date. This is a Second Generation June 2004 Power Mac G5 DP 1.8GHz. The Processors temperatures are typically around 150ºF-160ºF Im using iStat Menus. Fans arent even noticeable. Nothing makes noises at all, I was just wondering if this is normal activity and if I need to take the heat sinks off and apply AS5 paste. If temps go above 160ºF, I pull the side panel off the Power Mac as well as the air deflector and I remove the "G5 plate" from over the processors and let it vent (still running normally, Im not sleeping it or shutting down) and processor temps come down to 130-135ºF. Should I worry about logic board failure if I leave them at 160ºF (both CPU A and CPU B are always the same temp (usually within 2ºF of each other) This is my only Mac other than an over clocked eMac (900MHz from 700MHz) and a DP 1.0GHz Xserve G4. I want to keep this G5 in working order as long as possible. Thanks so much. Also, by the way I have been dusting this Power Mac out every week since day one using compressed air. There has never been anything more than the slightest amount of dust in this machine, sometimes no dust at all. This machine is well looked after. Thanks in advance.
Regards.
—Matthew—

I dont have a Hex key thats like what 10 inches? Long...the heat sinks are so deep. I wish it was a phillips
Item #1 on this page:
http://www.xlr8yourmac.com/systems/G5CoolantLeak_Repair/G5_CoolantLeak_Repairp1.html
Heck, KMart, WallMart, Ace Hardware, etc., will have similar.
I will try the Arctic cooling MX-3. Now, where can I get my hands on such amazing paste?
http://www.amazon.com/Arctic-Cooling-Performance-Non-Conductive-Compound/dp/B002 EHIJP0

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