Oil & Transmission Coolers

Engine and transmission oil coolers, cooler lines, adapters, sandwich plates and thermostatic controls — Derale, Crown Automotive, Vibrant Performance and more.

A transmission cooler is the single highest-value addition to a truck that tows. Automatic transmission fluid degrades sharply above roughly 220°F and the damage accumulates rather than announcing itself, so a cooler bought before the trip is worth more than a rebuild after it. Engine oil coolers do the same job for a hard-worked engine or one carrying weight in summer heat.

Size and plumb it for the job. A stacked-plate cooler sheds more heat per unit of frontal area than a tube-and-fin, which matters when there is little room ahead of the radiator. A thermostatic bypass keeps the fluid from running too cool in a Canadian winter — an over-cooled transmission shifts poorly and holds condensation.