As of this monday my moms car has been running really rough. She has a horrible track record of owning cars that fall apart and now her aurora seems to be doing the same thing.

I went to her work to have a look at the car, she thought something was wrong with the exhaust... unfortunately she was wrong...

I popped the hood and noticed it was running really rough, something the 4.0 never does... and when I checked the dipstick it was covered in white milky stuff.

She has already had the UIM replaced as it was cracked so I can't imagine they would have reused the same gasket there, but what about the LIM gasket or the head gasket? I heard somewhere that the 4.0 doesn't usually blow head gaskets, but I know these motors have problems past 100,000 and hers is at 115,000.

Unless its some easy fix (is it ever with a northstar?) it's pretty much a goner as there is no way we are dumping a few grand into this aurora, but it would be nice to have some idea of what it would take to fix it.

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2000 SE: 17" Chrome Grand Prix GTP wheels, Pirelli P-Zero Nero Rubber.
180,000 miles and running smooth

Meh, with it being a northstar that risk is always there. I'd be willing to bet it's a headgasket.

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Bye Bye:

RIP sandrock

she drove to the lot where it died right before she parked. She rolled into the spot and bought the 08 Malibu 2lt we test drove day before.

$15500, 30,000 miles, loaded to the gills. She is very happy.

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2000 SE: 17" Chrome Grand Prix GTP wheels, Pirelli P-Zero Nero Rubber.
180,000 miles and running smooth

Probably blew the studs on the head, releasing the bolt pressure. Not a headgasket. N*'s, especially older ones had head stud problem. There was one Caddy place that developed and sold re-studding kits that were infinitely better than OEM.

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Retired Bonneville Owner and former GM Tech:
2004 Pontiac Bonneville GXP: Black/Ebony *SOLD*

Summer Toys: Combined 827 RWHP / 877lb/ft RWTQ
2004 Pontiac GTO: Impulse Blue Metallic/Black/M6: lots 'o mods, 415 RWHP / 405lb/ft RWTQ!
2006 Cadillac STS-V: Light Platinum Metallic/Light Gray/A6 - Spectre CAI, Magnaflow exhaust, Speed Inc. tune, 412 RWHP / 472lb/ft RWTQ

Daily Drivers:
2019 Chrysler Pacifica Limited: Mommy's new RGC
2015 Chrysler Town & Country Limited Platinum: Kids new RGC
2007 Chrysler Town & Country Limited: Sold to neighbor
2009 Pontiac G8 GT: L76, Sport Red Metallic
2003 Chevrolet Suburban 2500: Doeskin Tan - 8.1L Big Block... new plow truck
1999 Chevrolet Suburban: Sunset Gold Metallic - Daddy's winter beater and plow truck