Engine oil is the lifeblood of any vehicle, ensuring smooth operation, reducing friction, and prolonging engine life. However, not all engine oils are the same. Mobile mechanics work with various oil types to suit different cars based on manufacturer specifications, driving conditions, and engine requirements. 

1. Conventional (Mineral) Oil

Best for: Older vehicles, standard driving conditions, budget-conscious drivers.

Conventional oil is derived from refined crude oil and is suitable for older vehicles with simple engine designs. While it provides adequate lubrication, it lacks the advanced additives found in synthetic oils. It also requires more frequent changes due to its lower resistance to high temperatures and oxidation.

Common Grades: 10W-30, 15W-40
Recommended For: Older petrol and diesel engines, light-duty vehicles.

2. Synthetic Oil

Best for: Modern engines, high-performance vehicles, extreme weather conditions.

Fully synthetic oil is engineered with advanced chemical compounds to provide superior lubrication, higher resistance to thermal breakdown, and better protection against engine wear. It lasts longer than conventional oil and performs well in both hot and cold climates.

Common Grades: 0W-20, 5W-30, 5W-40
Recommended For: Turbocharged engines, high-performance vehicles, new cars.

3. Semi-Synthetic (Synthetic Blend) Oil

Best for: Mid-range vehicles, drivers seeking better performance than mineral oil but at a lower cost than full synthetic.

This oil blends conventional and synthetic base oils, offering better protection than mineral oil but at a more affordable price than fully synthetic alternatives. It provides improved resistance to oxidation and high temperatures while maintaining good engine performance.

Common Grades: 10W-40, 5W-30
Recommended For: Light trucks, SUVs, mid-range cars.

4. High-Mileage Oil

Best for: Cars with over 75,000 miles, aging engines.

High-mileage oil contains additives that help reduce leaks, improve seals, and minimize engine wear in older cars. It often has conditioners that rejuvenate aging engine parts, reducing oil consumption and preventing sludge buildup.

Common Grades: 10W-40, 5W-30
Recommended For: Older vehicles, cars with excessive oil consumption.

5. Diesel Engine Oil

Best for: Diesel-powered vehicles, commercial trucks, heavy-duty applications.

Diesel engines require oil with a higher viscosity and additional detergents to handle the higher compression ratios and soot production in diesel combustion. Diesel-specific oils have additives that prevent sludge formation and provide superior lubrication under extreme conditions.

Common Grades: 15W-40, 5W-40
Recommended For: Vans, trucks, and diesel passenger cars.

Choosing the Right Oil for Your Car

Mobile mechanics determine the best oil based on:

Manufacturer’s Recommendation – Always check the owner’s manual for the correct oil viscosity and type.
Driving Conditions – High-performance or high-mileage vehicles may need synthetic or high-mileage oil.
Climate – Colder regions require lower viscosity (e.g., 0W-20), while hotter areas benefit from thicker oils (e.g., 10W-40).

The right engine oil enhances performance, improves fuel efficiency, and extends engine life. Mobile mechanics use various types of oils to match different vehicles and driving needs, ensuring optimal protection. If you’re unsure which oil is best for your car, consult a professional for expert guidance.