Checked oil specs by engine
2009 Cadillac STS oil capacity, type & filter
The 2009 Cadillac STS oil capacity is 6 qt (3.6L V6) and 8 qt (4.6L V8) and 9 qt (4.4L V8). All engines use 5W-30 oil.
| Engine | Capacity | Oil Type | Filter |
|---|---|---|---|
| 3.6L V6 | 6 qt | 5W-30 | AMSOIL EA15K28 |
| 4.6L V8 | 8 qt | 5W-30 | WIX 51522 |
| 4.4L V8 | 9 qt | 5W-30 | AMSOIL EA15K01 |
Match one of 3 checked engine options before buying oil or a filter.
AMSOIL EA15K28 is copied into the checkout checklist below. Other listed filters are source-backed alternatives.
WIX 51522 is copied into the checkout checklist below. Other listed filters are source-backed alternatives.
AMSOIL EA15K01 is copied into the checkout checklist below. Other listed filters are source-backed alternatives.
Search paths only — confirm your OEM viscosity spec and quantity before checkout.
2009 Cadillac STS oil specs: capacity conditions and filter notes
Check the door jamb sticker, owner's manual, or displacement badge on the engine cover. Match it to the engine options listed above before buying oil or a filter.
All listed filter part numbers are compatible alternatives for your vehicle. Choose any one brand, then confirm the exact part number at checkout.
Retailer fitment tools may use different data. Confirm oil capacity, viscosity, and filter part number before ordering.
Source coverage for the 2009 Cadillac STS
Supported by Pennzoil OATS, AMSOIL Lookup, and Castrol (Olyslager).
Supported by Pennzoil OATS, AMSOIL Lookup, and Castrol (Olyslager).
Supported by RockAuto, Purolator Part Finder, and AMSOIL Lookup.
5 checked source rows for the 2009 Cadillac STS.
Before ordering for this 2009 Cadillac STS
- Capacity
- 6 qt
- Oil type
- 5W-30
- Filter
- AMSOIL EA15K28
- Capacity
- 8 qt
- Oil type
- 5W-30
- Filter
- WIX 51522
- Capacity
- 9 qt
- Oil type
- 5W-30
- Filter
- AMSOIL EA15K01
Source check: Last checked 2026-06-24 from AMSOIL Lookup, Pennzoil OATS, RockAuto, Purolator Part Finder, and Castrol (Olyslager).
Cadillac STS oil specs by year
This table includes checked Cadillac STS model years available in our database.
| Year | Capacity | Oil type | Filter |
|---|---|---|---|
| 2011 | 6 qt | 5W-30 | R84090 |
| 2010 | 6 qt (multiple engines) | 5W-30 | AMSOIL EA15K28 |
| 2009 Current page | 6 qt (multiple engines) | 5W-30 | AMSOIL EA15K28 |
| 2008 | 6 qt (multiple engines) | 5W-30 | AMSOIL EA15K28 |
| 2007 | 6 qt (multiple engines) | 5W-30 | AMSOIL EA15K28 |
| 2006 | 6 qt (multiple engines) | 5W-30 | AMSOIL EA15K28 |
| 2005 | 6 qt (multiple engines) | 5W-30 | AMSOIL EA15K28 |
How we verified 2009 Cadillac STS oil data
How we verify fitmentChecked fitment data. Last checked: 2026-06-24.
This page checked 5 sources for the 2009 Cadillac STS. The table lists which checked source contributed capacity, oil type, or filter evidence.
We checked leading oil brands and aftermarket filter catalogs so you don't have to.
- Confidence
- Verified fit
- Sources checked
- 5
- Last checked
- 2026-06-24
- Capacity: Pennzoil OATS, AMSOIL Lookup, and Castrol (Olyslager)
- Oil type: Pennzoil OATS, AMSOIL Lookup, and Castrol (Olyslager)
- Filter: RockAuto, Purolator Part Finder, and AMSOIL Lookup
| Source | Supports | Checked | Link |
|---|---|---|---|
| AMSOIL Lookup | Capacity, Oil type, Filter | 2026-06-24 | Visit brand site |
| Pennzoil OATS | Capacity, Oil type | 2026-06-24 | Visit brand site |
| RockAuto | Filter | 2026-06-24 | Checked source |
| Purolator Part Finder | Filter | 2026-06-24 | Visit brand site |
| Castrol (Olyslager) | Capacity, Oil type | 2026-06-24 | Visit brand site |
2009 Cadillac STS oil FAQ
Which engine configuration applies to my vehicle?
Use the door jamb sticker, owner's manual, or engine cover badge to identify your engine, then match it to the engine options listed above.
Is the oil capacity measured with or without the filter?
Capacity condition matters. With filter includes a new filter. Service fill is the typical drain-and-fill amount. Dry fill is for a fresh empty engine only.
Why should I confirm before buying?
Retailer catalogs can update separately. Confirm the exact 2009 Cadillac STS selector at checkout before you buy.
Do I also need to match the OEM oil approval?
Yes. Viscosity is only one part of the oil spec. Match the oil approval listed in your owner's manual or on the bottle before checkout.
How often should I change the oil on a 2009 Cadillac STS?
Use the oil-life monitor or the interval in your owner's manual for this engine. Severe service can require a shorter interval.
Do I need a new drain plug gasket?
Replace it when your vehicle uses a serviceable gasket or crush washer. Confirm the gasket size and drain plug torque from the service manual or parts counter.
2009 Cadillac STS maintenance checklist
One part checked. Look up the rest while you're here.
- Cabin air filter 2009 Cadillac STS cabin filter part numbers
- Engine air filter 2009 Cadillac STS engine filter part numbers
- Oil type & capacity 5W-30 · 6 qt Checked
Where to buy
These are retailer search paths for your vehicle's oil and filter specs. Verify final fitment at checkout.
This section may include affiliate or sponsored retailer links. They are purchase paths, not fitment evidence.
Walmart
Compare oil and filter listings for the 2009 Cadillac STS. Confirm capacity, viscosity, and filter part number before checkout.
Search 2009 Cadillac STS oil & filter →AutoZone
Use AutoZone's vehicle selector for the 2009 Cadillac STS before checkout to confirm oil capacity, viscosity, and filter fitment.
Search 2009 Cadillac STS oil & filter →Amazon
Search Amazon listings for the 2009 Cadillac STS and check listing fitment notes against the specs above.
Search 2009 Cadillac STS oil & filter →O'Reilly
Open O'Reilly's fitment search for the 2009 Cadillac STS and verify oil capacity, viscosity, and filter part number before ordering.
Search 2009 Cadillac STS oil & filter →Look up another vehicle
Find checked oil capacity, type, and filter data by exact year, make, and model.