1999 Mercury Mystique Oil Type & Capacity
The 1999 Mercury Mystique oil type depends on the engine: the GS, 2.0 3, Automatic takes 5W-20 (4.5 quarts qt with filter); the GS, 2.0 3, Standard takes 5W-20 (4.5 quarts qt with filter); the GS, 2.5 L takes 5W-20 (5.8 quarts qt with filter); the LS, 2.0 3 takes 5W-20 (4.5 quarts qt with filter); the LS, 2.5 L, Automatic takes 5W-20 (5.8 quarts qt with filter); the LS, 2.5 L, Standard takes 5W-20 (5.8 quarts qt with filter), per the factory service manual.
Factory-spec answer
It depends on the engine:
- GS, 2.0 3, Automatic: 5W-20, 4.5 quarts with filter
- GS, 2.0 3, Standard: 5W-20, 4.5 quarts with filter
- GS, 2.5 L: 5W-20, 5.8 quarts with filter
- LS, 2.0 3: 5W-20, 4.5 quarts with filter
- LS, 2.5 L, Automatic: 5W-20, 5.8 quarts with filter
- LS, 2.5 L, Standard: 5W-20, 5.8 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| GS, 2.0 3, Automatic — 2.0L Eng | SAE 5W-20 Premium Synthetic Blend Motor Oil | 4.50 QTS. | 4.00 QTS. | Refer to Engine Oil recommended applications for SAE 5W-20 and 5W-30 motor oils TSB No. 02-1-9. |
| GS, 2.0 3, Standard — 2.0L Eng | SAE 5W-20 Premium Synthetic Blend Motor Oil | 4.50 QTS. | 4.00 QTS. | Refer to Engine Oil recommended applications for SAE 5W-20 and 5W-30 motor oils TSB No. 02-1-9. |
| GS, 2.5 L — 2.5L Eng | SAE 5W-20 Premium Synthetic Blend Motor Oil | 5.80 QTS. | 5.30 QTS. | Refer to Engine Oil recommended applications for SAE 5W-20 and 5W-30 motor oils TSB No. 02-1-9. |
| LS, 2.0 3 — 2.0L Eng | SAE 5W-20 Premium Synthetic Blend Motor Oil | 4.50 QTS. | 4.00 QTS. | Refer to Engine Oil recommended applications for SAE 5W-20 and 5W-30 motor oils TSB No. 02-1-9. |
| LS, 2.5 L, Automatic — 2.5L Eng | SAE 5W-20 Premium Synthetic Blend Motor Oil | 5.80 QTS. | 5.30 QTS. | Refer to Engine Oil recommended applications for SAE 5W-20 and 5W-30 motor oils TSB No. 02-1-9. |
| LS, 2.5 L, Standard — 2.5L Eng | SAE 5W-20 Premium Synthetic Blend Motor Oil | 5.80 QTS. | 5.30 QTS. | Refer to Engine Oil recommended applications for SAE 5W-20 and 5W-30 motor oils TSB No. 02-1-9. |
More factory specs & repair guides for your Mystique
🛞 1999 Mercury Mystique Tire Size & Pressure →🌧️ 1999 Mercury Mystique Wiper Blade Sizes →💡 1999 Mercury Mystique Light Bulb Sizes →📖 1999 Mercury Mystique Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
7.5 quarts (7.09 L) — 50/50 mixture of FORD Premium Cooling System Fluid and water
Frequently asked questions
What type of oil does a 1999 Mercury Mystique take?
It depends on the engine: GS, 2.0 3, Automatic uses 5W-20; GS, 2.0 3, Standard uses 5W-20; GS, 2.5 L uses 5W-20; LS, 2.0 3 uses 5W-20; LS, 2.5 L, Automatic uses 5W-20; LS, 2.5 L, Standard uses 5W-20.
What is the oil capacity of a 1999 Mercury Mystique?
Oil capacity depends on the engine: GS, 2.0 3, Automatic holds 4.5 quarts with filter; GS, 2.0 3, Standard holds 4.5 quarts with filter; GS, 2.5 L holds 5.8 quarts with filter; LS, 2.0 3 holds 4.5 quarts with filter; LS, 2.5 L, Automatic holds 5.8 quarts with filter; LS, 2.5 L, Standard holds 5.8 quarts with filter.
How often should I change the oil in my 1999 Mercury Mystique?
Most 1999 Mercury Mystique 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 — Mercury recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1999 Mercury Mystique?
Yes. 5W-20 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1999 Mercury Mystique. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.