We only have a couple left that don't have manifold pre-heaters. or I swear buy the ether for getting a few pops to get some heat going in there. It is a bit harsh on pistons/bearings. Our medium garbage trucks are all ISC, ISB, C7, 3406, Isuzu, and a Detroit here & there. 90 trucks have to turn rubber 5 days a week. Every diesel has an outboard jumper quick connect so we can put extra amps to the starter off another truck or starting unit. Sometimes we use a torpedo type kerosene heater and setit under the bumper and blow on the oil pan for a while and that will enable faster cranking once the oil loosens up.