The SPOOLOGIC Turbo Step Gap Oil Seal Kit SL-210-112 is a complete oil seal service pack for the factory GT3788VA turbocharger on 2007.5-2016 LMM / LML / LGH Duramax applications. Includes new compressor-side and turbine-side step gap piston-ring style seal rings — the two most common oil-control failure points on this CHRA. Ships as a seal-only pack for shops and DIY builders who are servicing a turbo that has developed oil leaks past the shaft seals but still has serviceable bearings and rotating hardware. If bearings, shaft, or thrust hardware also need replacement, order the full SPOOLOGIC Turbo Rebuild Kit for this platform instead.

What's Included

• 1 SPOOLOGIC turbo step gap oil seal kit — compressor-side and turbine-side step gap piston-ring seal rings

Features

• Compressor-side and turbine-side step gap piston-ring seal rings for the GT3788VA CHRA
• Precision-ground seal rings sized for the factory CHRA
• Addresses blue smoke, oil in intake, oil in exhaust housing caused by worn shaft seals
• Built brand new, never remanufactured

Fits 2007.5-2016 6.6L Duramax LMM LML / 6.6L Duramax LMM LGH

• 2007.5 – 2016 Chevrolet Silverado GMC Sierra 2500 / 3500 6.6L Duramax LMM LML
• 2007.5 – 2016 Chevrolet Express GMC Savana 2500 / 3500 / 4500 6.6L Duramax LMM LGH

Turbo Applications

• Garrett GT3788VA (2007.5-2016 6.6L LMM/LML/LGH Duramax)
• SPOOLOGIC SL-210-022 (2007.5-2016 6.6L LMM/LML/LGH Duramax turbo rebuild kit)

Replaces Factory OEM Part Numbers

• 12632248
• 12634300
• 12635167
• 12637721
• 12642129
• 12642314
• 12643546
• 848212-5002S
• 848212-9002S
• 886976-5004S
• BD1045830
• FPE-LML-VNT-63-FMW-N

DIY Product — All Sales Final, No Warranty, No Returns

This SPOOLOGIC turbo step gap oil seal set is a professional DIY assembly product intended for experienced turbo builders and rebuild shops. Successful installation requires proper tools, OEM service procedures, cleanliness standards, correct CHRA disassembly and reassembly technique, and dynamic balancing of the completed rotating assembly on a VSR balancer before return to service. Because SPOOLOGIC has no control over installation quality, balancing accuracy, or the condition of the parts the kit is installed into, all sales are final — no warranty, no returns, no exchanges. By purchasing this kit you acknowledge that you are responsible for correct rebuild, balancing, and installation.