the funny thing about the oil in IC thing, is that people and shady shops always suggest this as the problem or symptom of bad turbo but you have to remeber that on the stock intake with the swap done properly the crank vent after vlave cover t-redump comes back into the intake pipe and under heavier than normal load you can suck poop loads of oil into the turbo itself then through the hot pipe where it pools in the IC because of gravity and not crazy gangsta cfm compressor being used.
not sure if this is your issue though.
in other news ive never seen a t28/25 or crack and let coolant into the exaust. Were your afr's shady? High heat...
Oil burning into the exaust happens all the time on Sr turbos with bad seals.
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