1999 Porsche Boxster Oil Type & Capacity: 10W-40 (8.7 quarts)
The 1999 Porsche Boxster takes 10W-40 motor oil — 8.7 quarts with a filter change, per the factory service manual.
Factory-spec answer
10W-40 — 8.7 quarts with filter
Oil capacity by engine
| Engine | Oil Type (viscosity) | Capacity w/ Filter | Capacity w/o Filter | Notes |
|---|---|---|---|---|
| Automatic | API - SH, SAE 10W-40 | 8.70 QTS. | 8.20 QTS. | Manufacturer's approved fluid only. |
| Standard | API - SH, SAE 10W-40 | 8.70 QTS. | 8.20 QTS. | Manufacturer's approved fluid only. |
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More factory specs & repair guides for your Boxster
🛞 1999 Porsche Boxster Tire Size & Pressure →🌧️ 1999 Porsche Boxster Wiper Blade Sizes →💡 1999 Porsche Boxster Light Bulb Sizes →📖 1999 Porsche Boxster Factory Service Manual →All fluid capacities (transmission, coolant, brakes)Powered by factory manual data from our partner network AllOEMManuals.com.
Coolant capacity
18.0 quarts (17.03 L). Manufacturer's approved fluid only.
Frequently asked questions
What type of oil does a 1999 Porsche Boxster take?
The 1999 Porsche Boxster takes 10W-40 motor oil (API - SH, SAE 10W-40), per the factory service manual.
What is the oil capacity of a 1999 Porsche Boxster?
The 1999 Porsche Boxster oil capacity is 8.7 quarts with a filter change, or 8.2 quarts without changing the filter.
How often should I change the oil in my 1999 Porsche Boxster?
Most 1999 Porsche Boxster 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 — Porsche recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1999 Porsche Boxster?
Yes. 10W-40 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1999 Porsche Boxster. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.