Within reason, thicker oil maintains a better lubricant film between moving parts. Some have even used thicker oil in a leaky engine to prevent oil from seeping out. But really, thicker oil is not good for your engine. Not when “thicker” means higher viscosity than the manufacturer recommends.

Is it better to have thicker or thinner oil?

Engine oil viscosity

Thin oils reduce friction in engines and help engines start quickly during cold weather. Thick oils are better at maintaining film strength and oil pressure at high temperatures and loads.

Should I use thicker oil in an older engine?

A: Yes. This is a practical method to improve oil pressure in an older, high-mileage engine. The slightly thicker oil film from the heavier base weight oil - 10W - can help protect worn engine bearings as well.

Is Thicker oil better for high performance engines?

“While this is fine for stock engines, it can be disastrous for high horsepower engines. This is why many engine builders recommend using a heavier grade like 10W-30 because it only shears (drops viscosity) down and acts like a 5W-30 – just like the engine was built for.

Should engine oil thick?

Thin, low viscosity oils give better protection to engine parts at cold temperature. Thick, high viscosity oils are typically better at maintaining film strength to protect engines at high temperatures.

Will Thinner Oils Damage Your Engine?

Will thicker oil damage my engine?

Using oil that is thicker than recommended may lead to a decrease in fuel economy, a higher load on your engine, and even a shorter life for your engine. Conversely, using thinner, lighter-weight oil than recommended can cause excessive wear and shorter life.

Does thicker oil affect performance?

Thicker Oil May Not Flow Quickly Enough

His engine was designed specifically to use a lower-viscosity oil, in this case 0W-20. Its lower viscosity allows it to flow faster and fill the tiny clearances between parts, leading to a durable, consistent lubricating film.

What happens if I put 10w40 instead of 5w30?

Your vehicle does not use 5W-30 oil. The recommended oil viscosity for your vehicle, according to Kia documentation, is 10W-40. If you drive the vehicle in exceptionally cold weather, well below 32 degrees, you can use 5W-30 oil but even 10W-40 is still perfectly OK to use if outdoor temperatures are below freezing.

Why do race cars use heavy oil?

That being the case, they compete with each other for space, so to speak, like pigs competing for room at the trough. Racing oils are often formulated with a heavy dose of friction modifiers to add lubricity for maximum horsepower and torque.

Does thicker oil give more horsepower?

Oil shear is the point at which the oil begins to breakdown. Thinner oil viscosity allows the engine to produce more horsepower or maintain engine specs because the oil pump is not working as hard and rotational drag is decreased.

What kind of oil is best for high mileage engines?

10 Top-Rated Oils and Additives for High-Mileage Vehicles

• Valvoline High Mileage with MaxLife Technology Synthetic Blend Motor Oil. ...
• Pennzoil High Mileage Motor Oil. ...
• Slick 50 Recharged High Mileage Treatment. ...
• Gumout Fuel System Cleaner. ...
• Royal Purple High Mileage Synthetic. ...
• Techron Fuel Cleaner. ...
• Mobil Super High Mileage Oil.

Is 10w30 better for high mileage?

10W-30 motor oil makes for a decent high-mileage oil. It gives a better fuel economy while reducing the oil consumption for older engines. Older engines with more than 75,000 miles on them require a thicker oil that will properly lubricate their critical engine parts and prevent oil leaks, sludge, and deposits.

Is 5w30 better for older cars?

5W-20 and 5W30 motor oil are winter viscosity grade oils primarily recommended for older engines and light-duty use. These oils are best utilized in colder temperatures.

Why do new engines use thinner oil?

To prevent fuel consumption due to excessive fluid friction, automobile manufacturers (OEMs) strive to use even thinner engine oils.

What happens if you use 10w30 instead of 5w30?

Both 5w30 and 10w30 engine oils have a similar SAE rating, meaning that they will perform the same at high or operating temperatures. The digits 30 indicates the viscosity of the oils when in high temperatures. 10w30, however, will thicken more when in a cold climate. 5w30 is much suitable during the cold season.

Is 5w30 thicker than 10W40?

This means that the 5w30 oil will protect the engine better at low temperatures, usually when the engine is just starting or during weather conditions such as winter. At high temperatures, the 5w30 oil is thinner than that of 10w40 since 30 is lower than 40.

Does high performance oil make a difference?

With one high-performance car test with a leading synthetic oil, torque improved by less than 1 per cent and horsepower was up around 1.5 per cent. Fuel efficiency gains were better – up nearly 1 mile per gallon.

What oil do Top Fuel cars use?

Red Line® 70WT Nitro Drag Race Oil is utilized by NHRA Top Fuel and Funny Car champions. This race oil is designed for nitromethane, and dramatically improved fuel dilution.

Which engine oil is best for racing?

Mobil 1 Racing oils are high performance, fully synthetic formulas specially balanced for friction reduction and optimum horsepower with outstanding wear protection.
...
Mobil 1 Racing™ oils

• Mobil 1™ FS 0W-40. ...
• Mobil 1™ 15W-50. ...
• Mobil 1™ 5W-30. ...
• Mobil 1 Racing™ 0W-30. ...
• Mobil 1 Racing™ 0W-50. ...
• Where to buy Mobil 1 Racing™ oils.

Is 10W40 good for high mileage?

Designed for high mileage vehicles

Mobil 1 High Mileage 10W-40 motor oil is recommended by ExxonMobil for use in high mileage vehicles (even those that have used lower quality conventional oils^†), including: Cars. Trucks.

Which oil is better 10W30 or 10W40?

10W40 oil has a higher viscosity, retaining more thickness than 10W30 as the temperature rises. In that case, 10W-40 motor oil would technically provide better protection against engine wear contact in higher temperatures.

Is 5w30 oil thicker than 10w30?

Both the oils have similar viscosity at 100 degrees Celsius but 5w30 grade oil will thicken less than 10w30 grade oil in cold climate. This means 5w30 grade oil will flow effectively in low temperatures, whereas 10w30 oil will flow effectively in high temperatures because of the smaller temperature window.

Is 10w30 thicker than 10w40?

The difference between 10W-30 and a 10W-40 is the high temperature viscosity. Obviously, a 10W-40 is thicker than a 10W-30 at high temperature.

Is 20W 50 thick oil?

SAE 20W-50 is a thicker oil with high viscosity at hot temperatures and is highly resistant to oil thinning. Despite being one of the less popular oil viscosity grades, it's still recommended for a lot of automobile vehicles.