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egr failed. you just blowing un burnt fuel straight out the exhaust also if you have been doing this for along time you may have burnt out the cells in the cat. power steering is easy. one of the pipes is leaking, get on some ramps and find out witch one and either check it is not just the clip has come off of there is a split in the pipe. change the clip or the pipe.
the engine and transfer case are to totally different monsters your transfer case controls the four wheel drive if your engine was leaking oil and they replaced some seals most likely they seen grease and oil on the transfer case and assumed it was leaking from the leaking engine that is directly above it even if you dont use the four wheel drive I would still sugest getting that fixed because the axles still turn inside there and you dont want those bearings drying up and going bad
The northstar engine is great until it blowns a head gasket and starts leaking oil and water. If you have one you should start a class action lawsuit, because they have had enormous numbers of problems with that engine. Most problems start about 90k miles. I am amazed that Cadillac can get away with it (they are still producing the northstar engine).
crawl under the car with a drain contaner and a cresent wrench. Under the engine is the oil pan. The drain plug is located on the bottom end or slightly above on the side. It may be covered in dirt so scrap around. It has to be there. No other place for the oil to come out. It is possable it is a plug type with a large allen wrench hole or a squar hole that a ratchet will fit in to but most of them it is a bolt type. Don't forget to change the oil filter when changing oil. Let me know if this helps, The Raz
Cadillac 2003-06 CTS, 2004-06 SRX with base audio system, 2005-06 STS
Press the up and down arrow on INFO button on right side of driver information center display to access the DIC menu. Once 100% Engine Oil Life menu is highlighted, press and hold the CLR button. The percentage will return to 100 and oil life indicator will be reset. Repeat steps if not reset to 100. Cadillac 2003-06 CTS, 2004-06 SRX with Navigation System
Turn the system on by pressing the PWR/VOL knob once located at lower left of DIC display. Pres INFO button located to the left display to access the vehicle information menu. Turn the TUNE/SEL knob located at the lower right of the display until engine oil life is highlighted. Press the knob once to select it. Once the 100% engine oil life is displayed, press the multi- function button next to the reset prompt in the upper right corner of the display, the percentage will return to 100 and the oil life indicator will be reset. Repeat steps if not reset to 100.
There is an adapter for the oil filter with 2 lines coming out of it above the drive shaft from the transfer case to the front differential. The O ring on these will go sometimes causing loss of oil. Also check the 2 lines for leaks and cracks.