Hello all. I am in the process of rebuilding my front suspension and Powersteering systems. I have my new Powersteering system installed minus the need to flush its small resivour and connect it. *Now, my focus is on replacing the Engine Coolant systems hoses. This,, simply, because I don't want to bleed and burp the system then have a hose or something leak. I now recently went ahead and installed the GM AC Delco hose assembly that has the restrictor on it. Its the one from Rockauto that is pre-built. Aside that, I am going to go ahead and purchase the 2 larger radiator hoses while I'm empty of coolant plus a thermostat. This way I'm good and reliable and "keeping my fingers crossed" don't have to dump a new coolant installation to fix a hose that gives anytime near this whole new beginning. Now my question. I replaced this coolant resivour sometime after I purchased this car 12 years ago. it's a GM one and I purchased it directly "in person" from a nearby dealer. It has about "20,000 miles maximum" on it. That number of miles may be 18k. My concern is the coolant tanks plastic "side" where the two shells seem to be formed together are beginning to crumbe. The crumbling is happening on two thinner pieces where it seems to be two shells meeting but I'm not sure if this is even how it's made. I'm not sure if it's a two piece mold or one piece. it looks like two but I can't say this. Aside this information, isn't this coolant tank still considered a newer low mileage tank? The original tank that I replaced (because leaks) was pretty yellowed vs this one still very white and am thinking it WAS original with the 110,000 + miles because it's yellow color. What do you guys think about my tank here. Is this two piece looking crumbling lip edge that's deteriatoring something to worry about? Is this common on the edge of the tanks? I'm also asking if I perhaps develop a leak from reusing this resivour, can I just siphon the tank, carefully swap a new one in while the vehicle is cold without making a coolant mess? I don't want to reuse this tank if it's ready to give but if it's possible it will last 80,000 more miles like a yellowed one did, why would I waste the money now? Is the composition of this new tank flawed from the start? I'm wondering how many old yellow tanks have this crumbling going on? Maybe they all crumble? Should I keep going with this resivour? Or was it made defective? Note, I've always kept my dexcool properly mixed. Thanks.