Answer
Apr 27, 2026 - 11:21 AM
Yes, this KC Turbos rebuild kit (SKU: 300482) is compatible with a BorgWarner S300 58/70 turbo on your 1998 12-valve Cummins.
Compatibility Details
The KC Turbos Borg Warner S300-SXE rebuild kit works with all S300-SXE frame turbochargers, specifically including models S357 through S369. Your S300 58/70 falls within this compatibility range.
Since you're experiencing oil smoke when cold and your cooler tubes check out fine, this rebuild kit should resolve the problem as it replaces all the seals and bearings that typically cause oil leakage in these turbos. The upgraded 360-degree thrust bearing is particularly important for durability in diesel applications.
