2005 Buick LeSabre Oil Type & Capacity: 5W-30 (4.5 quarts)
The 2005 Buick LeSabre takes 5W-30 motor oil — 4.5 quarts with a filter change, per the factory service manual.
Factory-spec answer
5W-30 — 4.5 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Custom, 4T65E/M15 | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | Use oil that meets GM Standard GM6094M. For areas of extreme cold, where temperatures fall below -20Deg.F (-29Deg.C), it is recommended a SAE 5W-30 synthetic oil or a SAE 10W-30 oil. Both will provide easier cold starting and better protection for your engine at extremely low temperatures. |
| Custom, 4T65E/MN3 | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | Use oil that meets GM Standard GM6094M. For areas of extreme cold, where temperatures fall below -20Deg.F (-29Deg.C), it is recommended a SAE 5W-30 synthetic oil or a SAE 10W-30 oil. Both will provide easier cold starting and better protection for your engine at extremely low temperatures. |
| Limited, 4T65E/M15 | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | Use oil that meets GM Standard GM6094M. For areas of extreme cold, where temperatures fall below -20Deg.F (-29Deg.C), it is recommended a SAE 5W-30 synthetic oil or a SAE 10W-30 oil. Both will provide easier cold starting and better protection for your engine at extremely low temperatures. |
| Limited, 4T65E/MN3 | API - SAE 5W-30 | 4.50 QTS. | 4.00 QTS. | Use oil that meets GM Standard GM6094M. For areas of extreme cold, where temperatures fall below -20Deg.F (-29Deg.C), it is recommended a SAE 5W-30 synthetic oil or a SAE 10W-30 oil. Both will provide easier cold starting and better protection for your engine at extremely low temperatures. |
More factory specs & repair guides for your LeSabre
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Coolant capacity
10.0 quarts (9.46 L) — 50/50 mixture of DEX-COOL and clean drinkable water
Frequently asked questions
What type of oil does a 2005 Buick LeSabre take?
The 2005 Buick LeSabre takes 5W-30 motor oil (API - SAE 5W-30), per the factory service manual.
What is the oil capacity of a 2005 Buick LeSabre?
The 2005 Buick LeSabre oil capacity is 4.5 quarts with a filter change, or 4.0 quarts without changing the filter.
How often should I change the oil in my 2005 Buick LeSabre?
Most 2005 Buick LeSabre owners follow a 5,000–7,500 mile interval with conventional oil, or up to 10,000 miles with full synthetic. Always check the oil life monitor if equipped, and consult your owner's manual — Buick recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 2005 Buick LeSabre?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 2005 Buick LeSabre. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.