any opinions on what could have caused this. I check my oil dipstick regularly (once every 3 fill ups) and it remained in the operating range. Just changed the oil (2nd oil change on synthetic) and less than a quart of oil came out. I'm located in Los Angeles, San Fernando Valley to be exact. I've had multiple shops take a look at it ranging from Moorpark to South Central and so far none of them have the LT1 know how necessary to tell me what's going on. If any local Los Angeles Impala Club members could point me towards a good shop it'd be greatly appreciated.