1990 Plymouth Horizon Oil Type & Capacity: 5W-30 (4.5 quarts)
The 1990 Plymouth Horizon 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 |
|---|---|---|---|---|
| Automatic | API - SAE 5W-30 (Below 100Deg.F), 10W-30 (Above 0Deg.F) | 4.50 QTS. | 4.00 QTS. | — |
| Standard, A523 | API - SAE 5W-30 (Below 100Deg.F), 10W-30 (Above 0Deg.F) | 4.50 QTS. | 4.00 QTS. | — |
| Standard, A525 | API - SAE 5W-30 (Below 100Deg.F), 10W-30 (Above 0Deg.F) | 4.50 QTS. | 4.00 QTS. | — |
| Standard, A543 | API - SAE 5W-30 (Below 100Deg.F), 10W-30 (Above 0Deg.F) | 4.50 QTS. | 4.00 QTS. | — |
| Standard, A568 | API - SAE 5W-30 (Below 100Deg.F), 10W-30 (Above 0Deg.F) | 4.50 QTS. | 4.00 QTS. | — |
More factory specs & repair guides for your Horizon
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Coolant capacity
9.0 quarts (8.51 L) — PRESTONE II, PEAK, or antifreeze containing the ALUGARD 340-2 inhibitor system. Includes: 1 pt. in coolant reserve tank.
Frequently asked questions
What type of oil does a 1990 Plymouth Horizon take?
The 1990 Plymouth Horizon takes 5W-30 motor oil (API - SAE 5W-30 (Below 100Deg.F), 10W-30 (Above 0Deg.F)), per the factory service manual.
What is the oil capacity of a 1990 Plymouth Horizon?
The 1990 Plymouth Horizon 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 1990 Plymouth Horizon?
Most 1990 Plymouth Horizon 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 — Plymouth recommends intervals based on driving conditions, not just mileage.
Can I use synthetic oil in my 1990 Plymouth Horizon?
Yes. 5W-30 is widely available as a full synthetic, and synthetic is safe (often recommended) for the 1990 Plymouth Horizon. What matters most is matching the factory viscosity and specification, then changing the oil and filter on schedule.