Best Engine Oil for Petrol & Diesel Cars: Top Picks for 2026

The engine oil you select will determine how well your car runs and the lifespan of the engine. As a result, choosing the best engine oil for petrol & diesel cars in 2026 can be challenging due to the vast array of options available. Engine oil maintains your engine's temperature, keeps friction low, provides protection from wear and tear, and even improves mileage. We have outlined some expert recommendations below, along with practical advice to read and follow, as well as a guide on lubricants to help narrow down your final decision.

Why is it Important to choose the Best Engine Oil for Petrol & Diesel Cars?

Using low-quality engine oil sooner or later leads to engines losing performance at an early age. The best engine oil for petrol & diesel vehicles can ensure:

• Smooth gear shifting and acceleration

• Less engine noise and vibration

• Longer engine life

• Better fuel economy

• Protection against rust & deposits

It’s important to remember that every vehicle needs oil that is suitable for the engine specification, possible driving conditions, and throughout the manufacturer.

Best Car Engine Oil for Petrol and Diesel Vehicles – The Top Picks of 2026

Given below are the most trusted types of car engine oil you can choose for your vehicle in 2024-25:

1. Full Synthetic Oil

The best product for modern engines. It has excellent flow even in cold temperatures and provides the best protection when temperatures rise.

2. Semi-Synthetic Oil

A combination of mineral and synthetic oils. The best oil for drivers looking for performance without the price tag.

3. Mineral Oil

Best for older cars and budget-minded consumers. Although inexpensive, it needs to be changed frequently.

The common viscosity grades for Indian weather are 5W-30, 10W-40, and 15W-40. Check your car owner’s guide for the right grade.

Best Lubricant Oil Manufacturer in India

NITCO Lubricants is proudly regarded as the Best Lubricant Oil Company in India. Having manufactured world-class car engine oils, grease, and coolants to international standards for 25 years, NITCO Lubricants is known as one of the Best Lubricant Oil manufacturers in India. NITCO ensures unmatched quality through the use of advanced manufacturers and strict testing of our products.

Why does NITCO Lubricants stand out as an industry leader in the Best Lubricant Oil Manufacturer category?

• A proven track record with over 60 trusted distributors throughout India.

• A state-of-the-art, modern technology-based manufacturing plant in New Delhi.

• Export to over 7 countries.

• A full-range category of products

If you’re looking for the Best Lubricant Oil Company that values performance, durability, and customer satisfaction, NITCO is your reliable partner.

Car Lubricant Guide: How to Choose the Right Oil

This concise car lubricant guide helps you determine the right product for your petrol or diesel automobile: 

1. Check the Oil Grade 

Whenever possible, select the grade given in your car literature (10W-40, for example). The numerical characters explain oil performance at colder and warmer temperature boundaries.  

2. Check the API rating (or ACEA rating) 

The API and ACEA are recognized global standards that validate quality and performance.

3. Understand your driving habits 

City driving: semi-synthetic oil. 

Highway driving: fully synthetic.

 

4. Change your oil regularly 

Perform an oil change regularly, with the 8,000-10,000 km range recommended generally; however, follow the manufacturer’s guidelines. 

This car lubricant guide makes oil column readings less complicated and helps you keep your car efficient.

The science of car engine oils

I am going to break down engine oils into “base” oils and additives. Base oils give the car lubrication tendency, and additives protect against corrosion and prevent deposits. A quality car engine oil is designed to provide lubrication by reducing friction, maintaining engine temperature, and cleaning internal engine components. 

Some studies have indicated that high-quality synthetic engine oils can decrease engine wear as much as 47% (Source: SAE International). Meaning, it will decrease maintenance costs and performance over a period.

Why Choose NITCO Lubricants

• Over 25 years of manufacturing experience

• Top-grade raw materials from trusted international suppliers

• Products tested at every stage of production

• Wide distribution network across India

• Trusted by mechanics, workshops, and vehicle owners alike

NITCO’s modern facilities in Bahadurgarh, Delhi, and Guwahati make it one of the most reliable lubricant brands in India. The company believes that quality is not an accident but the result of effort and skill.

Quick Tips from the Car Lubricant Guide

• Always warm up the car before checking the oil level.

• Avoid mixing different types of oil.

• Replace the oil filter during every oil change.

• Store oil in a cool, dry place away from sunlight.

Following these small steps from the car lubricant guide can keep your engine healthy for years.

Selecting the right engine oil for petrol or diesel vehicles in 2026 can be straightforward if the focus is on quality and reputation. A reputable company like NITCO Lubricants can offer your engine the treatment it should have for reliable performance and peace of mind.

If you're interested in exploring high-quality oils, grease, or collants, visit NITCO Lubricants today and see what they offer for any vehicle.

FAQ’s

Q1. How frequently do I need to change the oil in my car engine?

Changing oil should be performed every 8,000 to 10,000 km, depending on the condition of the vehicle and how you drive the vehicle.

Q2. Can I use the same oil in petrol and diesel engines? 

Some oils can work in both types of engines. However, you should check the label to see if it is approved for dual usage.

Q3. What if I use the wrong oil? 

Using the wrong oil may result in lower engine efficiency, deposits forming, and a shorter life of the engine.

Q4. Where can I buy NITCO Lubricants? 

You can contact NITCO distributors around India or go to their website for more information.