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Adding a third radiator will boost the car’s overall cooling capacity, but at considerable expense and work as you will need to color match a new bumper, add the third radiator system kit, etc. Moving the car to a larger oil cooler will actually aid in lowering the car’s operational temps by accelerating removing retained heat from the oil before they have a chance to build up. Swapping out the cooler is a simple, and much cheaper, move (four bolts and new o-rings and you are in business), which when combined with a switch to the lower temp stat, for which you need to drain the cooling system anyway, typically goes a long way in improving the car’s overall running temps. We have had several customer’s note how much cooler the car stays, even on track days, after doing this; plus the UoA’s show the oil was happier as well. For reference purposes, data collection on base cars running the larger cooler, the 160 stat, and the third radiator, versus base cars with only the stat and cooler showed that the addition of the third radiator slowed down the rate of temp rise as well as cooled off more quickly than base cars without the extra radiator, but both eventually return to very similar lower steady state operating temps. Obviously, adding the larger cooler, the stat and a third radiator is the optimum setup, but not everyone is ready to spend that kind of money, particularly if doing two of the three gets you most of the way there.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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