I have a 2007.5 GMC 3500 CC LMM
Every since I installed EFI (3/21/12) the oil life is dropping very quick, like 1% for every 10-12 miles.
I had the Quadzilla economy nodpf tune for 3 1/2 years the oil life was normal about 1% for every 90 miles.
I really don't go by the oil life % but it does bug the heck out of me to see this happening, something is not right.
I have put the Quad back in and the oil life is back to normal.
I would like to continue using EFI tuning, but I also would like things to be back to normal.
Any ideas from any one ?
I did e-mail EFI on this, but no reply