1990 Ford Ranger Is Leaking Oil

Common Causes of Oil Leaks in Your 1990 Ford Ranger and How to Fix Them Effectively

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Reviewed by
Aisha
Written by RepairPal Car Genius
Updated January 14, 2025
0%
80% chance it's the
Oil System Components
0%
20% chance it's the
Engine Gaskets
The most common reasons a 1990 Ford Ranger is leaking oil are oil system component failure and leaking engine gaskets.
  • Oil System Components: A worn or damaged oil pump or filter can lead to low oil pressure, resulting in inadequate lubrication and potential engine damage.
  • Engine Gaskets: A worn or damaged engine gasket can lead to oil or coolant leaks, resulting in engine overheating or loss of lubrication.
Proper diagnosis will determine the exact cause of your symptom, saving you money on unnecessary repairs. The diagnostic experts at RepairPal Certified shops have the right tools and experience to solve any symptom.

How much does it cost to fix a 1990 Ford Ranger is leaking oil?

Common Repairs

The total repair cost will vary based on the condition of your vehicle and the number of repairs needed to fix your symptom. Proper diagnosis will save you money by finding the exact repairs needed to fix your car right the first time.

Oil pans don't wear out or break like other parts, they generally only need to be replaced because of external damage from an accident or an improperly tightened drain plug. The main symptom you will experience is an oil leak underneath the engine of your car. The oil that leaks from a damaged oil pan will range from dark brown to dark black. If the leak is large enough or occurs for long enough the oil level will be low enough to turn the oil pressure or low oil level warning light on.

An oil leak may be noted on the ground where the vehicle is parked. However, many vehicles have plastic trays underneath the engine that may catch leaking oil and conceal the leak. In such cases, a low oil level, a burning oil smell, or even smoke from oil burning in the engine bay may be noted.

»MORE: Signs of a bad oil pan gasket

The engine oil pressure warning light will come on if the engine oil pressure is low, or if the oil pressure sensor is faulty. In either case, engine power may be reduced significantly. The check engine light may also illuminate, and an on-board diagnostic (OBD) trouble code will be stored in the vehicle's computer.

What are the steps to diagnose the oil leak in a 1990 Ford Ranger?

To effectively diagnose an oil leak in a 1990 Ford Ranger, start by identifying the leak's location. This involves inspecting the underside of the vehicle to see where oil is dripping, focusing on common leak points such as the rear main seal, cam cover gasket, and oil pan. Once you have a clear idea of where the leak is coming from, check the oil levels in the engine; low levels can indicate a significant leak that requires immediate attention. Next, inspect the gaskets and seals for any signs of wear or damage, as these are often the culprits behind oil leaks. Cleaning the engine and surrounding areas is also crucial, as it allows you to better observe any new leaks that may appear after driving the vehicle. After addressing any visible issues, take the Ranger for a short drive and monitor for any new leaks, which will help confirm whether the problem has been resolved. By following this diagnostic approach, you can systematically assess and address oil leaks, ensuring your vehicle remains in good working condition.

What are the common causes of oil leaks in a 1990 Ford Ranger?

When dealing with oil leaks in a 1990 Ford Ranger, it's crucial to understand the common culprits that may be at play. One of the primary issues is a worn or damaged oil pan gasket, which can deteriorate over time, leading to oil pooling beneath the vehicle. Another frequent source of leaks is the valve cover gasket; if this seal becomes compromised, it can allow oil to escape from the engine. Additionally, a faulty oil filter, whether due to improper installation or damage, can also result in leaks. It's important to check the oil seals around the crankshaft and camshaft, as these can wear out and contribute to oil loss. Lastly, inspect the oil pan itself for any signs of damage from road debris or corrosion, as this can also lead to leaks. By regularly inspecting these components and addressing any issues promptly, you can maintain your Ford Ranger's performance and prevent further engine damage.

How urgent is it to address the oil leak in my 1990 Ford Ranger?

Addressing an oil leak in your 1990 Ford Ranger is not just a matter of routine maintenance; it is an urgent issue that requires immediate attention. Ignoring an oil leak can lead to a significant drop in oil levels, which compromises the lubrication of essential engine components. This lack of lubrication can result in severe engine damage over time, leading to costly repairs that could have been easily avoided. Furthermore, an oil leak increases the risk of engine overheating, as insufficient lubrication can cause friction and heat buildup, potentially resulting in catastrophic engine failure. The safety implications are also considerable; leaking oil can drip onto hot engine parts, creating a fire hazard that endangers both the vehicle and its occupants. Additionally, the environmental impact of oil leaks cannot be overlooked, as spilled oil can contaminate soil and water sources, contributing to pollution. Therefore, it is crucial to address any signs of an oil leak promptly to protect your vehicle, ensure your safety, and minimize environmental harm.

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