A buddy of mine just purchased a 2007 Dmax with 15x,xxx miles. He will be doing a Transynd flush Sunday, as well as an oil change. He asked me for an oil recommendation so I figured, where else to turn except BITOG? He uses Mobil 1 in his modded Camaro with good results and wanted to stay with a Mobil 1 product but, the 5w-40 TD isn't readily available at wally world. I'd like to get him to use a more cost effective & good conventional oil, with the ability to follow the OLM, do y'all have any recommendations? His driving style is aggressive to moderate, mostly highway with some stop'n'go traffic, central Texas climate with temps from 15F - 110F from winter to summer. If you don't think a conv oil can perform for the OLM with these driving conditions, then any wally world synth's or synth blends rec's are welcome too.