Engine Oil Types Explained: Conventional vs Synthetic vs Semi-Synthetic

Conventional (Mineral) Engine Oil

Conventional oil is the most affordable and commonly used engine oil made directly from crude oil. You can view it like refined petroleum, which is free from impurities but contains its natural molecular structure. 

Conventional oil is ideal for cars that require basic engine lubrication and protection. While it’s the most affordable compared to others, it breaks down faster under extreme temperatures and driving conditions, so choose accordingly. This oil is ideally recommended for old cars or cars with a relatively simple engine.
 

Synthetic Engine Oil

Synthetic engine oil is chemically engineered and highly refined to deliver superior engine lubrication. Since it delivers exceptional performance and protection, it’s much expensive than conventional and semi-synthetic oils. 

If you’re looking for an engine oil that flows better in cold weather, resists breaking down in high heat, and lasts significantly longer, then you should consider synthetic oil for your car. People who have modern cars, premium vehicles, turbocharged engines, etc., often choose synthetic car engine oil.
 

Semi-Synthetic Engine Oil

Semi-synthetic engine oil features a blend of conventional and synthetic engine oils. Their synthetic component improves the oil’s stability and protection, whereas their conventional part keeps the costs reasonable. 

Unlike synthetic engine oil, it isn’t highly priced, but it delivers comparable protection. You can choose semi-synthetic engine oil for mid-range cars, two-wheelers, or other vehicles that need moderate protection without the higher cost of synthetic oils.
 

Choosing the Right Engine Oil

Engine Type

Car owners must choose a car engine oil based on their vehicle’s engine design and age. Newer engines with advanced technology benefit from synthetic engine lubrication because it flows more easily through narrow passages to provide superior protection. 

Older engines with good mileage may actually perform better with conventional engine oil because their thicker formulation can help seal worn gaskets and reduce oil consumption. 

Driving Conditions

‘How’ and ‘where’ you drive should determine your choice of car engine oil, as varying conditions place varying demands on the lubricant. If you frequently make short trips, drive in stop-and-go traffic, or operate in extreme temperatures, then synthetic engine oil can provide significantly better protection and performance. 

If high price is a concern, then you can choose semi-synthetic engine oil. Conventional engine oil is a better choice if you primarily drive on highways at moderate speeds for extended periods. 

Manufacturer Recommendations

If you’re looking for the best recommendation for engine oil types, then you must check your car manual. Car manufacturers share recommendations after testing several engine oils. Hence, their recommendations are tested and backed by extensive research. 

If you want your car’s engine to last longer and perform optimally, then you should follow the manufacturer’s recommendation. If the manual isn’t available, then consider asking for a recommendation from your car dealership or a trusted mechanic.
 

Cost vs Performance Analysis

Basis of Analysis	Conventional (Mineral) Engine Oil	Synthetic Engine Oil	Semi-Synthetic Engine Oil
Performance	Basic protection, frequent wear	Superior protection	Balanced protection
Best Suited For	Older cars or cars with low usage or protection requirement	Premium cars, turbo engines, cars driving in harsh conditions	Mid-range cars used for daily commutes
Temperature Resistance	Low (breaks down at high heat)	High (withstands extreme heat and cold)	Moderate (stable in Indian conditions)
Cost	Low	High	Budget-friendly for most
Lubrication Quality	Basic; adequate for older engines	Superior; consistent under all conditions	Better than conventional oil; aids smooth running
Fuel Efficiency	Low to moderate	High	Moderate to good
Sludge Formation	High (deposits form faster)	Lower than conventional oil	Very low

 

Conclusion

Choosing between common engine oil types, such as conventional, synthetic, and semi-synthetic, can overwhelm new drivers. Hence, use the tips and comparative analysis of all engine oil types shared in this blog to make an informed decision. 

If you’ve purchased a new car, ensure you don’t just stop at choosing the right engine oil for your vehicle. Give equal attention to choosing the right car insurance for financial security. 

You can explore the comprehensive car insurance policy by Shriram General Insurance as it provides enhanced coverage and affordable premiums. We also provide a wide range of add-on covers, such as engine protection cover, zero-deprecation, roadside assistance, etc., for instant coverage personalisation.
 

FAQs

What is the difference between synthetic and conventional engine oil?

Synthetic engine oil is chemically engineered for better performance and higher temperature resistance, whereas conventional engine oil is refined from crude oil and breaks down faster under stress.
 

Is semi-synthetic oil good for Indian road conditions?

Yes, semi-synthetic oil is good for most Indian road conditions.
 

How often should I change engine oil?

The oil changing frequency depends on multiple factors, such as the engine oil type you’re using, the vehicle’s age, your driving conditions, etc.
 

Can synthetic oil improve fuel efficiency?

Yes, synthetic oil can improve fuel efficiency by reducing engine friction. It facilitates smoother operations.
 

Is synthetic oil worth the additional cost?

Yes, synthetic oil is worth the additional cost because it provides unmatched performance and protection.
 

What oil is best for turbocharged engines?

Full synthetic engine oils are better for turbocharged engines.
 

Does engine oil affect vehicle performance?

Yes, engine oil can directly affect vehicle performance by reducing friction, cooling engine parts, etc. Choosing poor-quality oil can lower the engine’s power and efficiency.
 

Can I switch from conventional to synthetic oil?

Yes, you can switch from conventional to synthetic oil if your budget permits.
 

What are the signs of poor engine oil quality?

Dark and gritty oil, reduced mileage, slow acceleration, unusual engine noise, etc., are common signs of poor engine oil.
 

How do I know which oil grade suits my car?

You can check your car’s manual for the manufacturer’s recommendation. If it’s not available, you can ask a trusted mechanic for recommendations.