AMSOIL 5W-20 100% Synthetic High-Mileage Motor Oil

AMSOIL 5W-20 100% Synthetic High-Mileage Motor Oil

With rapidly rising new-vehicle pricing and the high cost of repairs, drivers are keeping their vehicles on the road longer than ever. Preventive maintenance that includes high-quality lubricants is key for keeping vehicles safe and dependable for the long haul. AMSOIL 5W-20  100% Synthetic High-Mileage Motor Oil is designed specifically for the unique demands of high-mileage engines (or engines which have been using oils which left deposits), helping extend the life of your vehicle.

This is the first step to help clean up that engine w/o needing to use an engine flush.

It delivers purpose-built protection at a time in your vehicle’s life where it could benefit from more-robust maintenance. It cleans and protects engines with boosted detergency and an additive package that fights oil breakdown and oil leaks.

I suggest a couple changes with this oil then switch to XL or Signature.  This is a great choice should you buy a used car with over 80K on the odometer or that vehicle you really don’t know the history.

LOWER Cost than the XL Line!!

Product code : HM520QT-EA

Check out pricing in the case under the Preferred Customer program! AMSOIL cost less than our competition.

Buy & Check Price& Bottle Sizes

And our resourceful printable data sheet which is always kept up to date

Download PDFProduct Datasheet

Engine Cleanliness thanks to our High Mileage Oil Line

  • Enhanced detergency to breathe new life into dirty engines.
  • Removes deposit buildup to help restore peak performance.

Cleaning Requires a Durable Viscosity

Engines can lose compression as cylinders and piston rings wear. This leads to reduced horsepower. Maintaining a consistent fluid film helps to counteract compression loss by sealing combustion chambers to maintain performance. AMSOIL’s High-Mileage 5W-20 Motor Oil is formulated to maintain viscosity, even in extreme temperatures. Many will often upgrade from a 5W-20 to a 5W-30 in older vehicles when they have issues with oil consumption but with this High-Mileage oil that is not needed.

  • High Mileage 5W-20 Maintains proper film thickness in extreme operation.

Sludge Reduction

AMSOIL 100% Synthetic High-Mileage Motor Oil reduced sludge by 67%, VV demonstrating its cleaning power that helps engines last longer and perform better.

Demonstrating the cleaning ability of AMSOIL's High Mileage Motor Oil

Chart showing reduction of sludge via checking at intervals

Cleaning Requires a Durable Viscosity

  • High Mileage 5W-20 Maintains proper film thickness in extreme operation.

This 5W-20 Synthetic High-Mileage Motor Oil provides enhanced detergency to breathe new life into dirty engines by removing deposit buildup to help
restore peak performance.

Match Your VehicleProduct Guides

Oil-Consumption Control

  • Thermally stable across a wide range of temperatures.
  • Resists volatility and oil consumption.

Oil consumption is often an issue in high-mileage vehicles. AMSOIL 100% Synthetic High-Mileage Motor Oil is thermally stable across a wide range of temperatures, resisting volatility and consumption.

Leak Protection! Yes – no other competitor uses a QUALITY additive for this because it eats profits

  • High Mileage 5W-20 Conditions seals to help prevent leaks. – Even the Signature Series is famous for reduced leaks

Oil leaks are an inconvenience and if left unchecked can lead to lack of lubrication and engine failure. AMSOIL 100% Synthetic High-Mileage Motor Oil provides a boosted dose of seal conditioners to restore aging seals and help stop leaks.


API Licensed so you don’t have to be worried about whatever

  • Licensed by the American Petroleum Institute (API) to meet and exceed requirements commonly found in owner’s manuals.

5W-20 Applications (HM1030):

API SP SN, SN Plus, SM….; ILSAC GF-6A, GF-5, GF-4…; GM dexos1 Gen 3 (supersedes dexos1 Gen 2 and 6094M); Chrysler MS-6395; Ford WSS-M2C930-A, WSSM2C945-A, WSS-M2C945-B1, WSS-M2C960-A1.

Save 25%Join for More Perks Preferred customer Program

Motor Oil Comparison Chart – Compare the purpose of AMSOIL Products for your best choice.

Amsoil's High Mileage Oil cleans up deposits more!

Slides from AMSOIL anniversary High Mileage Oils


In Review 5W-20 High Mileage Synthetic:

  • Unique chemistry for vehicles with over 75,000 miles
  • Boosted detergent and dispersant package
  • Enhanced anti-wear additives
  • Reduced sludge by 67%,VV demonstrating cleaning power that helps engines last longer and perform better
  • Guaranteed Protection For 12,000 Miles/1-Year1
  • API Licensed

5W-20 High Mileage Oil Customer Reviews:

More reviews can be found on AMSOIL’s main site

More DIY feel good.

By  JEFFREY,  a  Verified Buyer  on  February 27, 2024
This product was brought up, and recommended as I read up about a particular vehicle that I purchased as a every day driver that has some possible catastrophic piston issues due to pre ignition, as I understood it to be, and I put about 400+ miles on a week on it. I change it, and the filter every 5k miles and hope for the best, so far everything seems fine.


Great oil

By  DAN,  a  Verified Buyer  from  Idaho   on  February 24, 2024
I have been using Amsoil for years and I am very pleased with the results. I just replaced the timing chain on my Mazda3 with 126,000 miles on it. When I removed it, it looked just the same as the new one I was replacing it with. No wear on the tensioner guides either. I’m sold on Amsoil.

So far so good.

By  RANDY,  a  Verified Buyer  from  California   on  February 19, 2024
Stoked to finally try out Amsoil in our 2015 Subaru Outback. The shipping was super fast and packaged well. The ol sube has over 200k on her so I thought I’d better start using a super premium oil like Amsoil to stretch that life out of her. Really happy so far…oil consumption isn’t a problem after putting 3k on this oil change so far. Royal purple was the previous oil used for the first 200k and at this point I would have already added at least half a quart. So like I stated…so far so good.👍

Low on power

By  DAVID,  a  Verified Buyer  from  S Texas   on  February 17, 2024
Been using this on my 327000 97yukon 2door and truly think Amsoil is the only reason why my suv is still running as strong with no engine issues. I drive my truck seven hours to west texas towing a 171 jayco once I get there I idle my truck while working for 13-14 hours a day in heat, cold, rain, dust storms, and still drive it back to south Texas after my fourteen day hitch. I send my oil samples through the company I work for and have never got back a bad or concerning sample even if go over my mileage intervals. I would never leave amsoil and take a chance with any other oil