O-rings on Oil Pickup Tube - Go Bad with Age or Miles?

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GreenDen07

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{I posted lately as YD2007, and found my original Name (GreenDen07).}

2007 Yukon Denali, 170,000 mi, 2nd owner, bought in Spring of 2011.

Had the O-ring replaced after Thanksgiving, and pressure improved from 5 (idle) /25 (cruise), to 15 (idle) / 40 (cruise). Had a complete split. I've read here some were in 3 pieces, some crumbled a little.
QUESTION: do these go bad with AGE, or MILEAGE ?

On Jan 6, wife says engine is making noise...she wasn't kidding. Very loud CLICK-CLICK-CLICK..., faster with faster RPM's, and oil pressure is higher now ! ...20 (idle) / 50 (cruise). Mechanic says without actually taking off oil pan and looking for actual noise source, that I need a new engine. He may be right - it sounds terrible, and doesn't get much quieter when warmed up.

Dealer friend has for sale, for a good price, a 2007 Yukon XL, 88,000 mi (and a lot less features, and no warranty). But I'm concerned about the oil pressure / o-ring issue, and hence my question above: is age or mileage the key in these going bad? He also said he could put in a GMC re-man engine in our vehicle for X$$$, 3 yr/100K warranty - may go with this.

Also, our Yukon had rear main seal leak at 165,000 mi, and will the "lower-mileage" 2007 start leaking around 150,000+ also? quite likely I'd guess. Another reason to put in reman engine in our vehicle. I may also have dealer take their best guess as to the cause of the CLICKing.

Dave H.
 
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Can't really say if its age or mileage, but mine went bad around 215,000. Also, I'll go with the reman if I was you, but you could also look into performance engines and end paying around the same price or a little more
 

drakon543

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Both factors play a part in things failing on vehicles. If a vehicle does alot of sitting around for long periods of time without being driven the seals can wear out prematurely. But again if its driven all the time things will just wear out from use. Your best option is The one you feel the most comfortable doing. If you go with the other vehicle your already aware of the oring issue so make sure you get it fixed as a preventative. Seems to go bad between 150kand 200k so get it replaced at 140k.
 

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