So how do y'all start your engines? I'm not really scientific with my WMO, a little settling and a little filtering, and about 10% rug....... kinda.....but in north west Florida it's hot enough I run almost straight wmo. So when I started using this stuff more than a year ago I would start up and shut down on diesel, and then I got less scientific and started using ether. Over 50°F, it's a brief shot and it fires almost immediately. Under 50°, it's a brief shot some cranking another shot and a little more cranking and she's usually alive. And that's in a turbo 7.3idi.