If there was no oil in it and you just had the oil changed, I would check to see where it leaked from. The people who did the oil change may be responsible for the damages. THere is no way you should have used 6 qts of oil in 1200 miles. Check for evidence of a major leak.
Next, don't even bother with a different engine size. I'm not saying it can't be done, but it isn't worth the effort and will end up costing you much more. Everyting needs replaceds, computer, vacuum harness, wiring harness, sensors and the list goes on and on and on. Stay with a direct fit part and you will be much further ahead.
Let me know about leaks.
Joe
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Sunday, January 3rd, 2010 AT 4:33 PM