Best Oil Additive For High Mileage Cars to Buy Right Now (2023)

Sometimes it might be quite difficult to find the best oil additive for high mileage cars. With every niche market offering so many different products, it makes sense that this is the case.

Unfortunately, this very fact can make it incredibly difficult to find the item that best suits your needs, which is why we’ve put together this oil additive for high mileage cars buying guide.

Our 15 Best Picks:

The 15 Best Oil Additive For High Mileage Cars Reviews:

SaleBestseller No. 1
High Mileage Oil Stabilizer
  • Package Dimensions: 28.956 H x 8.128 L x 8.382 W (centimetres)
  • Package Weight: 0.93 kilograms
  • Country of Origin : United States
  • Fit type: Universal Fit
Bestseller No. 2
High Mileage Oil Treatment, Stop Leak Formula for Cars and Trucks, 15 Oz, STP
  • One 15 fl oz bottle of STP High Mileage Oil Treatment + Stop Leak
  • ZDDP oil additive prevents wear to protect your high-mileage vehicle
  • High-viscosity formula creates a thick cushion between moving engine parts to reduce friction
  • Leak stopper helps prevent engine leaks, noises and smoking and helps to rejuvenate seals and gaskets
  • Add this oil treatment to engine oil during every oil change
Bestseller No. 3
Bar's Leaks High Mileage Engine Repair, 16.9 oz
  • Increases Oil Pressure
  • Reduces Friction
  • Helps Clean Internal Parts
  • Quiets Noise
Bestseller No. 4
Rislone High Mileage Engine Treatment, 16.9 oz
  • Reduces friction and wear
  • Quiets noisy lifters and valves
  • Removes and prevents sludge
  • Add to engine oil anytime
  • Will not void manufacturer's new vehicle
SaleBestseller No. 5
Slick 50 750002 Recharged High Mileage Engine Treatment, 15-Ounce
  • High Mileage solution to protect against power robbing friction heat and wear
  • Restores performance in engines due to wear and oil consumption in older engines
  • Revitalizes seals to help stop oil leaks and prevent them from ever occuring
  • Powerful detergents to remove and prevent oil sludge, use during your next oil change or between changes to replace lost additive content
  • Powerful detergents to remove and prevent oil sludge, use during your next oil change or between changes to replace lost additive content
Bestseller No. 6
TriboTEX Nano Oil Additive Car Engine Treatment: Add to Engine Lube - Makes High Mileage Cars Like New with a Synthetic Material (Treats One Regular Car, Truck, Tractor or Small Diesel)
  • GROUNDBREAKING: Made in the USA – TriboTEX is a revolutionary engine oil additive. It contains synthetic nanoparticles developed with funding from the U.S. Department of Energy, NASA, & the National Science Foundation.
  • QUIETER & SMOOTHER PERFORMANCE: Reverses wear in bearings by building a diamond-like carbon coating.
  • UNIVERSAL: Compatible with all types of motor oil and can be used in gas or diesel engines. Use for both old and new cars. It is an excellent engine booster.
  • EFFICIENT: Our masterfully engineered engine treatment improves fuel consumption and reduces engine noise. It is time to improve your engine and take your driving experience to a new level.
  • GUARANTEED QUALITY: We know you will be delighted with this ground-breaking technology. Our treatment comes with a 100% satisfaction guarantee.
Bestseller No. 7
TRIAX High Mileage Oil Treatment, Seal Revitalizers, Corrosion Inhibitors, Viscosity Stabilizers, Anti-wear, 12 Oz (1 Bottle)
  • Stops engine oil leaks and engine vibration at startup
  • Quiets noisy valves, lifters, and various engine noises
  • Stabilizes viscosity
  • Prevents oil burning, piston blow-by, and oil from getting into the combustion chambers
  • Coats moving parts, like pistons, rings, bearings, valves and lifters helping to prevent wear and noise
Bestseller No. 8
Rislone High Mileage 4 6 8 Compression Repair, 16.9 oz.
  • Restores lost compression
  • Repairs blow-by
  • Frees sticky rings
  • Viscosity improver
  • Use on any gasoline or diesel engine
Bestseller No. 9
Pennzoil High Mileage Conventional 10W-30 Motor Oil for Vehicles Over 75K Miles (5-Quart, Single-Pack)
  • Conventional High Mileage 10W-30 engine oil specially formulated for new or late model SUVs, light vans and trucks, and passenger cars
  • Recommended for vehicles with over 75, 000 miles
  • Helps prevent sludge and other damaging deposits
  • Contains seal conditioning agents for dry or cracked engine seals to help reduce leaks and oil consumption
  • Provides proven wear protection for engine parts
Bestseller No. 10
TriboTEX Small Oil Additive Engine Treatment: Add to Engine Oil - Makes High Mileage Engines Like New with a Synthetic Material (Treats One Motorcycle, Lawn Mower, Generator) 4 & 2 Stroke
  • Contains synthetic nanoparticles developed with the U.S. Department of Energy, NASA, & National Science Foundation
  • Reverses wear in bearings by building a diamond-like carbon coating
  • Compatible with all types of motor oil and can be used in gas or diesel engines
  • Improves fuel consumption and reduces engine noise
  • Safe for wet clutches in motorcycles
SaleBestseller No. 11
Valvoline Full Synthetic High Mileage with MaxLife Technology SAE 5W-30 Motor Oil 1 QT
  • ENHANCED MAXLIFE TECHNOLOGY PREVENTS engine breakdown in extreme conditions with 50% better wear protection than the industry standard
  • TREAT AND PREVENT LEAKS with premium seal conditioners to keep oil out of places it shouldn’t be
  • 25% EXTRA DEFENSE AGAINST DEPOSITS, sludge, corrosion and rust via interior-cleansing detergents
  • EXTREME TEMPERATURE PROTECTION through our high-quality base oils and superior viscosity modifiers
  • MEETS OR EXCEEDS ALL REQUIREMENTS of ILSAC GF-6A, API SP, API SN with SN PLUS, API SN
Bestseller No. 12
Castrol 03112 GTX High Mileage 20W-50 Motor Oil - 5 Quart
  • Superior detergency that helps prevent deposit build up
  • Superior oil burn off protection versus leading conventional oils
  • Seal conditioners help reduce leaks; Bottle Color: Green
  • Advanced additives that help prevent engine wear
  • Exceeds ILSAC GF-5, API SN
Bestseller No. 13
Valvoline High Mileage with MaxLife Technology SAE 5W-20 Synthetic Blend Motor Oil 5 QT (Packaging May Vary)
  • 40% Better wear protection than the industry standard with enhanced anti-wear additives, keeping critical engine components safe and preventing metal surfaces from making contact
  • Exceptional temperature protection no matter the weather with superior viscosity modifiers to ensure oil flows more easily, coats more completely, and resists thermal breakdown even in the fiercest driving conditions
  • Enhanced friction performance helps maximize power with advanced friction-fighting agents that properly lubricate moving parts and help your older engine maintain its horsepower to perform its best for longer
  • Reduce sludge, deposits, corrosion, and rust with added detergents and anti-corrosion additives, sustaining your engine’s performance and preventing higher emissions
SaleBestseller No. 14
Rislone 4405 Engine Oil Supplement Concentrate with Zinc Treatment - 11 oz, Yellow
  • Prevents Camshaft Wear
  • Reduces Piston Scuffing
  • Increases Engine Life
  • Makes Newer Oils Work In Older Engines
Bestseller No. 15
Prolong Super Lubricants PSL11000 Engine Treatment - 12 oz. , White
  • Includes a Formula with Anti-Friction Metal Treatment Technology
  • Features Engineering Designed to Treat Metal Surfaces of Both Gasoline and Diesel Fueled Engines
  • Offers Molecules that Interact with Metal Surfaces and Chemically Bond to Create a Protective Layer that Reduces Damaging Friction and Heat
  • Offers to Protect the Engine Even when the Motor Oil is Not Yet Fully Circulating
  • Features a Formula Containing No Solid Particles Such as PTFE Resins, 'Molys', Zinc, Copper, or Graphite

Last update on 2023-01-12 / Affiliate links / Images from Amazon Product Advertising API

How to find the best oil additive for high mileage cars?

Here, we’ll be going over a number of factors that you can use to ensure that you’re purchasing the best oil additive for high mileage cars for you.

Regardless of which type of item you’re looking to buy, chances are that there are existing buying guides on the internet, all of which aim to give you good oil additive for high mileage cars recommendations.

Despite these recommendations, however, it’s always a good idea to do your own research. In addition to this research, asking yourself the following questions is also super helpful:

  • What features does the oil additive for high mileage cars need to have to be perfect for my needs?
  • What is my budget?
  • Do I need to purchase a certain brand?

Once you’ve answered these questions and have a good idea of what you’re looking for and the buying process becomes much easier. Keep in mind that when looking for the best product, there’s no need to rush. In fact, very rarely are the ideal products found by choosing the first one you see or by basing your decisions on only one factor. Take your time and enjoy the process!

Now, with the answers to the previous questions in mind, we urge you to use our upcoming buying guide for oil additive for high mileage cars to find what you’re looking for:

Brand

In some cases, the brand of oil additive for high mileage cars is very important. For example, if you’re looking for an item that works in tandem with another, you might very well need both products to be the same brand. If this is the case, it’s vital to pay attention to this factor, as choosing the wrong product can mean the difference between wasting your money and buying a great product that functions as it should.

Features

The features in any given oil additive for high mileage cars are important because they can dictate which version of an item you need and how much money you need to spend. Consider all the key features that you want your item to have and don’t settle for anything that doesn’t check at least ¾ of your boxes.

Reviews

Customer reviews about oil additive for high mileage cars are crucial – especially when you’re buying a product that costs a lot of money or serves a big importance. Luckily, most products can be found online, which means that it’s common for there to be scores of customer reviews from those who have already purchased any given product.

Pay attention to these reviews. Take note of the pros and cons that they mention, and factor these into your big decision. In some cases, you’ll be forced to sacrifice one con in order to gain a particular pro, but being aware of the potential con is going to be beneficial in either case.

Quality

Of course, quality is key. You don’t want to purchase a low-quality product. If you do, you run the risk of your item breaking, not working properly, or otherwise proving to be very disappointing, as well as a waste of money.

You can compare oil additive for high mileage cars quality by researching what your potential purchases are made from, contrasting the individual items against each other to discern which one is made of the best materials.

Warranty

Warranty isn’t always going to be important, but it definitely can be. This is especially true if the item in question is tech-related or expensive. A good warranty will be valid for an extended time after purchase and cover a variety of problems ranging from item defects to random accidents, water damage, and other miscellaneous events that could ruin your product.

Conclusion

The quest to find the best oil additive for high mileage cars can be daunting – but it doesn’t have to be. It can be made much easier by asking yourself a few simple questions and then thinking critically about the items you want to buy. Consider their features, quality, brand, warranty, and customer reviews and you’re more likely to make a great purchase.