I have a 2006 Nissan Frontier with the 4.0L V6, and it’s now blowing serious blue/white smoke out the tailpipe while the oil pressure gauge reads so low at idle that it throws a red idiot light. The oil level is normal according to the dipstick, and the oil has been changed twice in a few months with no improvement. I’m guessing a bad piston ring or something - not a cracked block or blown head gasket, as it’s not leaking any oil at all - so I’d like recommendations for a repair shop in Tulsa that can tackle the job. Southwestern Engine Rebuilder is one possibility; anyone else you folks know do a good job? Thanks.