Mitsubishi Repair: 1990 turbo eclipse awd, fuel management system, rod bearings

Question
Hi, I had a brand new engine put into my 1990 eclipse, it came with forged pistons, new rods, crank, bearing, etc...I also got a bigger 16g turbo (new as well).  I then got a new bigger intake header and a 264 cam (i) and 272 cam (e) and I put 1000 miles on it.  I spun all the rod bearings and scored the crank.  Then 2 weeks ago, I paid $3000 to fix the bearings and crank and had ONLY the block flushed from the spun bearing fragments which I was told was only necessary (didn't have to flush the whole engine).  Anyway...here's my problem...I ran 86 miles on my car (mostly light driving (under 3K rpm)) and did an oil change (using GTX 10w-40) and the oil came out very dark almost black and smelled badly of gas.  The mechanic said he thinks I need a better fuel management system...what happened to my oil???  black after only 86 miles.

Thanks !!  

Answer
Zac: Just an idea on my part, what happen to breaking in a new engine? I have come up behind new cars, with little or no miles on them; they are almost smoking. I thought there was a break in time for that engine, why not go 200 miles and see what happens. I don't know about the better fuel management system. Ask him about breaking in the new parts and the engine. And see what he tells you, or get a second mechanic to check the car. If you are not happy with the first get someone else to see what they will say. It is all better to have two different mechanics check things over. As the second guy about the break in time? Now this is only my idea, I will check around and see what my friends say that works on cars too. You know the oil removes dirt well what not from inside that engine, new parts have to seat themself's and so think about this for a bit.  Hope this helps and good luck! Linda