In addition, many industrial lubricants and metalworking oils also contain LOAs. The major functional additive types are dispersants, detergents, oxidation inhibitors, antiwear agents, extreme-pressure additives, and viscosity index improvers.

Controlling chemical breakdown Typical detergents are magnesium sulfonates. Corrosion or rust inhibiting additives retard the oxidation of metals inside an engine. Antioxidant additives retard the degradation of the oil stock by oxidation. Typical additives are organic amines and phenols.

Motor oil additives have three basic roles: Enhance existing base oil properties with antioxidants, corrosion inhibitors, anti-foam agents and demulsifying agents. Suppress undesirable base oil properties with pour-point depressants and viscosity index (VI) improvers.

Engine oil additives improve lubrication, performance in extreme temperatures and extend the life of the engine oil. Some additives improve the viscosity of the engine oil for optimum performance under varying operating temperatures, thereby reducing wear and tear.

Generally speaking, the longer oil is used, the more additives will be lost. Over time, using motor oil that lacks important additives can cause increased wear and tear on your engine. It may result in poor fuel economy, rust and corrosion, oil sludge, overheating, breakdowns and other serious engine damage.

1. Editor’s Pick: Lucas Heavy Duty Oil Stabilizer.
2. Marvel Mystery Oil.
3. Hot Shot’s Secret Original Stiction Eliminator.
4. Archoil Oil Additive (AR9100)
5. Prolong Super Lubricants Engine Treatment (PSL11000)
6. REV X High Performance Oil Additive.
7. Liqui Moly Cera Tec Friction Modifier.
8. Restore Engine Restorer & Lubricant.

High-mileage motor oil doesn’t hurt and it could prevent leaks from starting. Some mechanics recommend switching to a thicker (higher viscosity) oil — such as 10W-30 full synthetic oil instead of 5W-20 full synthetic — or using oil additives to stop leaks.

Since using this product, I usually don’t lose more than half a quart between oil changes and the engine seems to run smoother. I highly recommend Lucas for any high-mileage vehicles, it really works!

Engine oil treatment can help to improve older engine issues. Fuel leaks, caused by fuel lines and their fittings, occur when parts crack or sustain damage due to normal wear and tear. Treating engine oil keeps older lines and fittings healthy to increase effectiveness at containing the fuel in the fuel tank.

The composition of a typical engine oil is as follows:

• 78% base oil.
• 10% viscosity improvement additive (to improve flow)
• 3% detergent (detergent substances which clean the engine)
• 5% dispersant (for the suspension of dirt particles)
• 1% wear protection.
• 3% other components.

Some after-market oil additives contain corrosive chemicals, including chlorine-based lubricating compounds that may be harmful to internal engine parts. STP® products do not contain any corrosive components and are safe for use in all engines.

STP Synthetic Oil Treatment delivers all the same benefits of our traditional oil treatment but has been re-formulated for use with low-viscosity oils. Use STP Synthetic Oil Treatment in addition to five quarts of oil at every oil change. Detergent helps combat deposits and keep the engine running clean.

Directions. STP® Oil Treatment Petrol should be added to the engine oil when the engine is warm, at a rate of one 300ml can to 3 litres of oil, or one 450ml bottle to 4 or 5 litres of oil (10% treat rate).

Scientifically Treated Petroleum

10,000 mile normal operation.

My Conclusion: Pennzoil Platinum or Mobil 1? It is almost 3x stronger against viscosity breakdown than Mobil 1 Extended Performance Synthetic Motor Oil. You can drive up to 15000 miles without worrying about the oil change.

The traditional recommendation is to change the oil every 3,000 miles or three months, whichever comes first. This rule of thumb came about in the 1950s as a safe estimate of how long engine oil holds up. This might be true for older cars, but most new cars can go longer than that between changes.

6 of the Best Synthetic Oils for Protecting Your Car’s Engine

• Mobil 1’s 0W-40 Synthetic. Mobil 1 amazon.com. Shop Now.
• Pennzoil Ultra Platinum 0W-40. Pennzoil amazon.com.
• Motorcraft Synthetic Blend 5W-30. Ford amazon.com.
• Motorcraft Full Synthetic 5W-50. Ford amazon.com.
• Castrol Edge Professional OE Full Synthetic 0W-20. Castrol amazon.com.
• Castrol Edge Supercar 5W-50. Castrol amazon.com.

• Mobil 1 Extended Performance Synthetic Oil.
• Pennzoil Platinum Full Synthetic Motor Oil.
• Mobil 1 High Mileage Synthetic Oil.
• Castrol GTX MAGNATEC Full Synthetic Oil.
• Liqui Moly Synthoil Premium.
• Valvoline SynPower Full Synthetic Oil.
• Castrol EDGE Advanced Synthetic Oil.
• Valvoline High Mileage Synthetic Oil.

If you are looking for better preservation qualities, Mobil 1 is generally a better choice than the Castrol Edge. But for conventional motor oils, Castrol Edge’s magnatec additives make it the better and more suitable choice.

No. Switching brands is not harmful to your engine as long as you choose an oil marked with the API donut of the same level, e.g., API SN. You may give up enhanced performance if you switch from synthetic or high mileage to conventional oil. MYTH: When motor oil becomes dark, that means it’s time to change it.

Top 10 Best Motor Oils

• Table of contents. Editor’s Pick: Castrol GTX Motor Oil.
• Editor’s Pick: Castrol GTX Motor Oil.
• Featured Product: Liqui Moly Molygen New Generation.
• Valvoline Daily Protection Motor Oil.
• Quaker State Advanced Durability Motor Oil.
• AmazonBasics Motor Oil.
• Havoline Motor Oil.
• Pennzoil Motor Oil.

Multiple tests run concluded that Valvoline SynPower was four times better than Mobil 1 in terms of wear protection when measured in 5W-30 grade tests.

Yes, you can safely mix one brand of oil (e.g. Mobil 1) with a different brand (e.g. AMSOIL) or conventional oil with synthetic oil (in fact, that’s what a synthetic blend is). Most synthetics today are fully compatible with conventional oils and can safely be mixed.

Keep in mind oils do not mix if you have 5w30 and add 10w30 it won’t give you a blens both oils will stay seperate so you will have a few quarts 5w30 and a quart 10w30 they never mix. By industry agreement/specification, all brands of oils will work fine together. Different viscosities will work fine.

80% or more of the cost of the finished oil is due to the additive package in the base oil. The cheaper it is the lower quality or fewer additives are in the oil. Do not go cheap on engine oil, it’s literally the life blood of your engine.

As posted above, mixing 5w30 with 10w40 will give you an oil that performs somewhat better in the cold than 10w40, but less good cold than 5w30, and that has a viscosity a bit higher than 5w30 but a bit lower than 10w40.

If you use 10-w-40 instead of 5-w-30 specified by the manufacturer then the viscosity of 10-w-40 used by you will be higher and oil thicker than what is specified during winters. Similarly the oil viscosity will be higher and oil thicker than specified during summers. How does 5w30 oil compare to 10w40?

5w30 is less viscous while 10w40 is more viscous. The 5w30 has a viscosity of 30 at high temperature while a 10w40 has a 40 viscosity at high temperatures. When at high temperatures, the 5w30 oil becomes thinner than the 10w40 oil since 30 is lower as compared to 40.

Using the wrong oil can lead to reduced lubrication and shorter engine life. If the manual says to use synthetic oil, do so. Contrary to what some believe, adding synthetic oil to regular oil won’t harm the engine, but there’s also no benefit in doing so.