hwp
Platinum Member
A magnetic heater that attaches to the oil pan is OK for gas engines. It will keep the oil warm but not the block, but that is OK because ignition comes from the spark plugs. OTH, a diesel engine uses compression for combustion and if the block is cold it is more difficult to get combustion, so a heater that warms the coolant and hence the block is required. BTW, in colder climates, a battery heater can be a godsend as it will enable the battery to deliver more punch on cold days.