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The Techron cant hurt and leaving the vehicle propped up in the front for a while shouldnt cause that kind of oil to leak into the intake (unless you had it on a huge angle and running... did you check your pumps?
The 420/430 code usually triggers if the 2 O2 sensors (one in fronto of the cat, one behind the cat) start to read too closely sensing cat failure... BUT... all the oil burning through the system 'could' most definitely cause that....
Get it all cleaned out with the Techron, take it for a good drive (keep an eye on smoke), and then reset the codes, see if they come back... after you drove it for a bit, check the crossover pipe from the AOS to the intake to see if its full of oil again....
Heiko
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Previously owned:
2000 Boxster S 3.2 Ocean Blue / 1974 911 Targa Silver
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