Water-cooling improves mechanical durability and lengthens the turbocharger’s life. Many turbochargers are designed without water cooling ports and are suffi ciently cooled by air and the lubricating oil that fl ows through them. Other turbochargers, such as many in the Garrett® GT & GTX ball bearing lineup, are designed from the beginning to be cooled by oil and water. How can we tell the difference between an air/oil-cooled turbo and an oil/water-cooled turbo? If the turbocharger’s center housing has threaded ports on either side, at 90° from the oil inlet/ outlet fl anges, then it is water-cooled. In order to meet durability targets defi ned by Garrett® engineers during its development, it needs water fl owing through it