The 2018 Cadillac XTS has 38 engine parts with verified fitment on this page — 15 part types and 13 brands, covering both the 3.6L V6 and the 3.6L V6 Turbocharged. Each part includes a manufacturer part number and application notes.
On the 2018 Cadillac XTS, the engine covers the internals and hard parts that build compression and keep oil where it belongs — gaskets, bearings, camshafts, lifters, seals and timing components. Most of the listed parts are Connecting Rod Bearing (6 parts), Conversion / Lower Gasket Set (6 parts) and Crankshaft Seal (6 parts). The other 12 part types cover the remaining 20 parts.
The 2018 Cadillac XTS was sold with both the 3.6L V6 and the 3.6L V6 Turbocharged. Every part on this page is engine-specific. Each part shows which engine(s) it fits.
The most listed brands for 2018 Cadillac XTS engine parts are GM GENUINE (19 parts), KING ENGINE BEARINGS (4 parts) and MAHLE / CLEVITE (3 parts), plus 10 more brands. Quality grades include Standard Replacement and High Performance.
6 parts on this 2018 Cadillac XTS page carry a "Popular" badge — the source catalog's flag for options frequently chosen for this vehicle — including GM GENUINE 12643667 (Connecting Rod Bearing) and FEL-PRO CS263761 (Conversion / Lower Gasket Set). Click any part number to see every vehicle that part fits.
Barometric Pressure Sensor
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 3.6L V6 Turbocharged | 12711681 | 🇺🇸 US 🇨🇦 CA | In Air Cleaner | View on Amazon |
This table covers the Barometric pressure sensors. Typical signs include a check-engine light for MAP or fuel-rail pressure, or a limp mode under load. A vacuum leak or a clogged reference line will fake a bad pressure sensor.
This group shows a single part: GM GENUINE 12711681.
Camshaft
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 3.6L V6 Turbocharged | 12638172 | 🇺🇸 US 🇨🇦 CA | Lifter Type: OHC Roller TappetIncludes Ring | View on Amazon |
| GM GENUINE Fits: 3.6L V6 Turbocharged | 12641988 | 🇺🇸 US 🇨🇦 CA | Computer Controlled Compatible: YES | View on Amazon |
| GM GENUINE Fits: 3.6L V6 Turbocharged | 12638402 | 🇺🇸 US 🇨🇦 CA | Includes Ring | View on Amazon |
| GM GENUINE Fits: 3.6L V6 Turbocharged | 12669978 | 🇺🇸 US 🇨🇦 CA | Exhaust Duration at .050 inch Lift: 118 DD | View on Amazon |
This table covers the camshafts that open the valves.
4 Camshaft parts for the 2018 Cadillac XTS come from GM GENUINE.
Listed part numbers: GM GENUINE 12638172, GM GENUINE 12641988 and GM GENUINE 12638402, plus the other parts above.
Camshaft Alignment Tool
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| LISLE Fits: 3.6L V6 Turbocharged | 37530 | 🇺🇸 US 🇨🇦 CA | GM | View on Amazon |
This table covers the Camshaft Alignment tools. This is a service tool, not a wear part — match the application in the notes.
One part is listed for the 2018 Cadillac XTS — LISLE 37530.
Camshaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 3.6L V6 Turbocharged | 12574477 | 🇺🇸 US 🇨🇦 CA | Camshaft Sprocket Seal | View on Amazon |
This table covers the seals at each camshaft end. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
One part is listed for the 2018 Cadillac XTS — GM GENUINE 12574477.
Connecting Rod
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 3.6L V6 Turbocharged | 12641607 | 🇺🇸 US 🇨🇦 CA | POWDERED METAL | View on Amazon |
This table covers the connecting rods between each piston and the crankshaft.
This group shows a single part: GM GENUINE 12641607.
Connecting Rod Bearing
High Performance
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| KING ENGINE BEARINGS Fits: 3.6L V6 Turbocharged | CR6826XPX | 🇺🇸 US 🇨🇦 CA | Race bearings, Trimetal [Pmax Black]Set | View on Amazon |
| KING ENGINE BEARINGS Fits: 3.6L V6 Turbocharged | CR6826XP | 🇺🇸 US 🇨🇦 CA | SetRace bearings, Trimetal [Pmax Black] | View on Amazon |
Standard Replacement
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Popular Fits: 3.6L V6 Turbocharged | 12643667 | 🇺🇸 US 🇨🇦 CA | Use with 2012 and BeyondExcept Brazil (CV2) | View on Amazon |
| KING ENGINE BEARINGS Popular Fits: 3.6L V6 Turbocharged | CR6826SI | 🇺🇸 US 🇨🇦 CA | SetBimetal (Aluminum Silicon Base) | View on Amazon |
| MAHLE / CLEVITE Fits: 3.6L V6 Turbocharged | CB2037A | 🇺🇸 US 🇨🇦 CA | A Series (Aluminum)Coated | View on Amazon |
| MAHLE / CLEVITE Fits: 3.6L V6 Turbocharged | CB2037A6 | 🇺🇸 US 🇨🇦 CA | A Series (Aluminum)Coated | View on Amazon |
This table covers the bearings in the connecting-rod big ends. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly.
6 Connecting Rod Bearing parts for the 2018 Cadillac XTS come from 3 brands — KING ENGINE BEARINGS, MAHLE / CLEVITE and GM GENUINE. The "Popular" part is GM GENUINE 12643667.
The High Performance section lists 2 options from KING ENGINE BEARINGS — engineered beyond original-equipment specification. KING ENGINE BEARINGS CR6826XPX is listed in this group.
In the Standard Replacement grade, MAHLE / CLEVITE, GM GENUINE and KING ENGINE BEARINGS supply 4 parts: built to original-equipment specification. A representative part number is GM GENUINE 12643667.
This group includes GM GENUINE 12643667, KING ENGINE BEARINGS CR6826XPX and KING ENGINE BEARINGS CR6826XP and the remaining parts above.
Connecting Rod Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 3.6L V6 Turbocharged | 11519680 | 🇺🇸 US 🇨🇦 CA | M9X1X53 | View on Amazon |
This table covers the Connecting Rod bolts.
One part is listed for the 2018 Cadillac XTS — GM GENUINE 11519680.
Conversion / Lower Gasket Set
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO Popular Fits: 3.6L V6 Turbocharged | CS263761 | 🇺🇸 US 🇨🇦 CA | Includes RTV Sealant | View on Amazon |
| SKP Popular Fits: 3.6L V6 Turbocharged | SKCS263761 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| AJUSA Fits: 3.6L V6 Turbocharged | 54277700 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| APEX Fits: 3.6L V6 Turbocharged | ACS11064 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| ITM ENGINE COMPONENTS Fits: 3.6L V6 Turbocharged | 0929106 | 🇺🇸 US 🇨🇦 CA | View on Amazon | |
| MAHLE / CLEVITE Fits: 3.6L V6 Turbocharged | CS54661 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers lower / conversion gasket sets for oil-pan and related joints. Typical signs include the leaks that sent the engine or gearbox to the bench. Use every gasket the set is meant for that opening — leftover unused pieces usually belong to another configuration.
6 Conversion / Lower Gasket Set parts for the 2018 Cadillac XTS come from 6 brands — FEL-PRO, SKP, AJUSA and 3 other brands. The "Popular" part is FEL-PRO CS263761.
Part numbers include FEL-PRO CS263761, SKP SKCS263761 and AJUSA 54277700, among others listed above.
Crankshaft
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| ENGINETECH Fits: 3.6L V6 Turbocharged | 112950 | 🇺🇸 US | Includes Connecting Rod Bearings & Crankshaft Main BearingsReman | View on Amazon |
| GM GENUINE Fits: 3.6L V6 Turbocharged | 12642339 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the crankshafts that turn piston motion into rotation.
2 Crankshaft parts for the 2018 Cadillac XTS come from 2 brands — ENGINETECH and GM GENUINE.
This group includes ENGINETECH 112950 and GM GENUINE 12642339.
Crankshaft Main Bearing
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 3.6L V6 Turbocharged | 12643668 | 🇺🇸 US 🇨🇦 CA | Except Brazil (CV2)# 3 | View on Amazon |
| GM GENUINE Fits: 3.6L V6 Turbocharged | 12643670 | 🇺🇸 US 🇨🇦 CA | Except Brazil (CV2)# 1,2,4 | View on Amazon |
| KING ENGINE BEARINGS Fits: 3.6L V6 Turbocharged | MB4272SI | 🇺🇸 US 🇨🇦 CA | SetBimetal (Aluminum Silicon Base) | View on Amazon |
This table covers the main bearings that support the crankshaft in the block. Typical signs include a growl that rises with speed, or play in the shaft or hub. Set preload the way the notes specify. A dry or crushed bearing fails quickly.
3 Crankshaft Main Bearing parts are listed for the 2018 Cadillac XTS, from GM GENUINE and KING ENGINE BEARINGS.
Listed part numbers: GM GENUINE 12643668, GM GENUINE 12643670 and KING ENGINE BEARINGS MB4272SI.
Crankshaft Main Bearing Cap Bolt
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 3.6L V6 Turbocharged | 12560272 | 🇺🇸 US 🇨🇦 CA | M10X2X102.5 | View on Amazon |
| GM GENUINE Fits: 3.6L V6 Turbocharged | 11518861 | 🇺🇸 US 🇨🇦 CA | SINGLE USEOUTBOARD | View on Amazon |
| GM GENUINE Fits: 3.6L V6 Turbocharged | 11589001 | 🇺🇸 US 🇨🇦 CA | M8X1.25X25Hexflange | View on Amazon |
This table covers the Crankshaft Main Bearing Cap bolts.
3 Crankshaft Main Bearing Cap Bolt parts for the 2018 Cadillac XTS come from GM GENUINE.
This group includes GM GENUINE 12560272, GM GENUINE 11518861 and GM GENUINE 11589001.
Crankshaft Repair Sleeve
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| BCA Fits: 3.6L V6 Turbocharged | NS99166 | 🇺🇸 US 🇨🇦 CA | Front | View on Amazon |
This table covers the sleeves used to restore a grooved crankshaft seal surface.
One part is listed for the 2018 Cadillac XTS — BCA NS99166.
Crankshaft Seal
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| FEL-PRO Popular Fits: 3.6L V6 Turbocharged | BS40711 | 🇺🇸 US 🇨🇦 CA | PTFE Rubber Seal | View on Amazon |
| GM GENUINE Popular Fits: 3.6L V6 Turbocharged | 12608750 | 🇺🇸 US 🇨🇦 CA | Material: Steel Fluoro ElastomerSeal Type: Spring Loaded Multi Lip | View on Amazon |
| APEX Fits: 3.6L V6 Turbocharged | ABS1164 | 🇺🇸 US 🇨🇦 CA | Rear | View on Amazon |
| GM GENUINE Fits: 3.6L V6 Turbocharged | 12637710 | 🇺🇸 US 🇨🇦 CA | Seal Type: Spring Loaded Multi LipIncludes Seal | View on Amazon |
| SKF Fits: 3.6L V6 Turbocharged | 38085 | 🇺🇸 US 🇨🇦 CA | Rear | View on Amazon |
| VICTOR REINZ Fits: 3.6L V6 Turbocharged | 191001101 | 🇺🇸 US 🇨🇦 CA | Set | View on Amazon |
This table covers the front and rear seals that keep oil in at the crankshaft. Typical signs include a wet housing, a drip after sitting, or fluid flung off a rotating shaft. Fix the surface the seal rides on. A new seal on a grooved shaft will leak again.
6 Crankshaft Seal parts are listed for the 2018 Cadillac XTS, from GM GENUINE, FEL-PRO, APEX and 2 other brands. FEL-PRO BS40711 carries the "Popular" badge.
This group includes FEL-PRO BS40711, GM GENUINE 12608750 and APEX ABS1164 and the remaining parts above.
Cylinder Head
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 3.6L V6 Turbocharged | 12709312 | 🇺🇸 US 🇨🇦 CA | Right6 speed Automatic trans. | View on Amazon |
This table covers the cylinder heads that close the top of the block.
One part is listed for the 2018 Cadillac XTS — GM GENUINE 12709312.
Cylinder Head Alignment Dowel Pin
| Brand | Part Number | Markets | Notes | Buy |
|---|---|---|---|---|
| GM GENUINE Fits: 3.6L V6 Turbocharged | 12570326 | 🇺🇸 US 🇨🇦 CA | View on Amazon |
This table covers the Cylinder Head Alignment Dowel pins.
This group shows a single part: GM GENUINE 12570326.
Buying Engine Parts for a 2018 Cadillac XTS
On this vehicle, the engine covers the internals and hard parts that build compression and keep oil where it belongs — gaskets, bearings, camshafts, lifters, seals and timing components.
- Match the engine first. Every engine part here is engine-specific; each row shows which engine(s) it fits.
- Read the notes on each row for position, trim and spec qualifiers before you order.
- Where labor overlaps, replace the seals and gaskets for anything you open up; a timing job should always include the tensioner and guides, not just the belt or chain.
- Cross-reference the manufacturer part number against your old part or a service-manual listing.
Start with the largest groups on this page: Connecting Rod Bearing and Conversion / Lower Gasket Set .
Frequently Asked Questions
How many engine parts fit the 2018 Cadillac XTS?
Our catalog currently lists 38 engine parts for the 2018 Cadillac XTS across 15 subcategories and 13 brands, covering both the 3.6L V6 and the 3.6L V6 Turbocharged. Each part is matched to the engine(s) it fits.
Do engine parts differ between 2018 Cadillac XTS engines?
Yes. Every engine part on this page is engine-specific. Each row shows which engine(s) it fits — use the filter at the top to hide the rest. If you're unsure which engine you have, check the emissions label under the hood or the 8th character of your VIN.
What are the signs of engine problems on a 2018 Cadillac XTS?
Common symptoms include oil spots under the vehicle, blue or white exhaust smoke, ticking from the valvetrain, or coolant mysteriously disappearing. If you notice any of these, identify the affected subcategory above and cross-reference the part numbers listed.
What should I replace at the same time?
Where labor overlaps, replace the seals and gaskets for anything you open up; a timing job should always include the tensioner and guides, not just the belt or chain.
What do the market flags (US, CA, MX) on each part mean?
They show the market for which the manufacturer published application data for that part — where the vehicle was first sold, not where the part was made. If your 2018 Cadillac XTS was originally sold in the US, the safest choice is a part marked for the US market.
How do I make sure a part fits my 2018 Cadillac XTS?
First match the engine — each row shows which engine(s) the part fits. Then engine hard parts are unforgiving of guesswork — confirm the casting or engine code before ordering, because one model year can hide two different blocks. The notes column carries position and trim qualifiers where they apply.
Other Parts for the 2018 Cadillac XTS
Engine Parts for Other Cadillac XTS Years
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