Normally my OCI is 4-5k mi, but I recently moved and and have a baby so I haven't had the time. As for the oil leak, I think its coming from crankshaft oil seal. I'm not sure of the seal's GM part number is though so I may have to pull it out and get the number off the seal. I also threw a can of Liqui Moly Oil Saver in for now. Other than the known issues of Toyota engines burning oil (because of the drain holes on the pistons getting clogged), I have no obvious indications that I'm burning oil and fouling the cat/O2 sensor (no soot in exhaust, no smoke, no sulfur smell).
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a) Connect the hand – held tester or OBD II scan tool to the DLC3. (b) Warm up the engine to normal operating temperature. (c) Read the voltage output of the heated oxygen sensor when engine is suddenly raced. HINT: Perform a quick racing to 4,000 rpm 3 times using the accelerator pedal. Heated oxygen sensor output voltage: Alternates from 0.4 V or less to 0.5 V or more.
Not sure I understand the work around here, how do spark plug antifoulers help with O2 sensor readings from a loss of cat efficiency?