Here's why and what you should do instead:
* Engine Oil Viscosity: Oil viscosity (thickness) is crucial. The correct viscosity is printed on your owner's manual or oil cap sticker. It's usually a 5W-30 or 10W-30 for a 1998 F-150.
* Engine Condition: Older engines might benefit from higher viscosity oil (like a 10W-40) to compensate for wear. However, modern synthetics can be beneficial even in older engines.
* Climate: Cold climates require thinner oil (5W-30) for easier starting. Hot climates or heavy towing often benefit from thicker oil (10W-40 or even 20W-50).
* Oil Type: Your 1998 F-150 might have an oil type specified (conventional, synthetic blend, fully synthetic).
Here's what you should do:
1. Check Your Owner's Manual: This is the most important resource for your vehicle. It will have the recommended oil type, viscosity, and oil change intervals.
2. Inspect your Oil Cap: The oil cap sticker may have the recommended viscosity, but it's always best to consult the manual for full details.
3. Consider your Driving Conditions: Take into account the climate you live in and whether you regularly tow heavy loads.
4. Consult a Mechanic: If you're unsure, a trusted mechanic can assess your engine's condition and provide personalized recommendations.
General Recommendations:
* Conventional oil: Typically a good choice for older engines, especially if you are on a budget.
* Synthetic blend: Offers improved performance and protection compared to conventional oil, at a moderate price point.
* Full synthetic: Provides the best performance and protection, but it's also the most expensive option.
Remember: Using the wrong type of oil can damage your engine, so make sure to choose the correct oil for your 1998 F-150!
