Search  for anything...
Royal Purple

Royal Purple (11751-4PK HMX SAE 10W-30 High-Mileage Synthetic Motor Oil - 5 Quart, (Case of 3)

Based on 900 reviews
Condition: New
Checking for the best price...
$169.18

Buy Now, Pay Later

As low as $28.20 / mo
  • – 6-month term
  • – No impact on credit to apply
  • – Instant approval decision
  • – Secure and straightforward checkout

Ready to go? Add this product to your cart and select a plan during checkout.

Payment plans are offered through our trusted finance partners Klarna, Affirm, Afterpay, Zip, Apple Pay, and Google Pay. No-credit-needed leasing options through Acima may also be available at checkout.

Learn more about financing & leasing here.

Selected Option

Free shipping on this product

30-day refund/replacement

To qualify for a full refund, items must be returned in their original, unused condition. If an item is returned in a used, damaged, or materially different state, you may be granted a partial refund.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

Availability: 13 left in stock
Fulfilled by Performance Guarantee✅
Arrives Thursday, Nov 5
Order within 16 hours and 59 minutes

Available payment plans shown during checkout

Protect Your Purchase

Easy claims online, fast replacements, no fees

Checking for protection plans...

Recently Viewed

At a glance

Condition
New
Size
5 qt, Case of 4
Weight
30.2 lb
Liquid Volume
640 fl oz
Package Information
Can
Vehicle Service Type
Car, Truck
Viscosity Level
Low to Medium

Features 4

  • For best performance, follow the manufacturer's recommendations in your vehicle owners manual
  • HMX is chemically enhanced to revitalize hardened seals, reducing oil consumption common in high-mileage engines
  • Also provides outstanding oxidation resistance to safely extend oil drain intervals, and an ionic attraction to metal surfaces, providing protection and minimizing wear at start-up
  • Formulated with robust zinc/phosphorus anti-wear compounds combined with Royal Purple's proprietary additive technology

Description

Royal Purple HMX SAE 10W-30 High-Mileage Synthetic Motor Oil, 5 quart (Case of 4) is specifically designed to minimize wear and restore lost performance in engines with more than 75,000 miles. Formulated with robust zinc/phosphorus anti-wear compounds combined with Royal Purple's proprietary additive technology Synerlec, HMX is chemically enhanced to revitalize hardened seals, reducing oil consumption common in high-mileage engines. In addition, HMX is fortified with stout detergents to remove engine build-up and deposits, maintain cleanliness and promote engine longevity. The advanced Synerlec technology in HMX provides exceptional film strength, reducing friction and metal to metal contact for peak engine performance. It also provides outstanding oxidation resistance to safely extend oil drain intervals, and an ionic attraction to metal surfaces, providing protection and minimizing wear at start-up. Engineering formulations is a balancing act as engine oil has several key functions to perform. Higher mileage engines require a shift in this balance in certain regards as compared to new engines, such as anti-wear, detergency and preserving and restoring seal elasticity. Recommended for gasoline passenger car and light-truck engines beyond 75,000 miles, HMX can safely extend oil drain intervals up to 15,000 miles or 12 months in unmodified, mechanically-sound engines with proper filtration. When using HMX, Royal Purple recommends first performing two short clean-up drain intervals of 3,000 miles each with HMX to thoroughly clean the engine before extending drain intervals. Royal Purple HMX is suitable for use in engines specifying API service SJ, SL, SM and SN.

Specs 19

SAE J300 Viscosity Grade 10W-30
Brand Royal Purple
Liquid Volume 640 fluid ounces
Package Information Can
Vehicle Service Type Car, Truck
Brand Name Royal Purple
Manufacturer Part Number 11751-4PK
UPC 641330117510

Frequently asked questions

If you place your order now, the estimated arrival date for this product is: Thursday, Nov 5

Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.

To initiate a return, please visit our Returns Center.

View our full returns policy here.

  • Klarna Financing
  • Affirm Pay in 4
  • Affirm Financing
  • Afterpay Financing
  • Zip Pay in 4
  • Financing through Apple Pay
  • Financing through Google Pay
Leasing options through Acima may also be available during checkout.

Learn more about financing & leasing here.

Similar Products

Top Amazon Reviews

Another great product from RP!
Size: 1 Quart, (Case of 6)
First off, I'll admit I've become a royal purple fan boy of late. I always knew RP made great stuff, but I didn't want to spend the extra $. After a complete RP fluid changeover in my truck, I am 100% satisfied with every RP fluid I've used. I run the hmx in my motor, max atf in my transmission and transfer case, as well as their gear oil in both front and rear differentials. This hmx high mileage oil is the best high mileage oil out there, by FAR. I've tried just about every high mileage oil available and this hmx stuff goes far beyond what the others did. My Dodge Dakota has the 4.7L V8 and has over 160k miles, so I wanted to do everything I could to keep it running as long as possible. On cold start ups, my truck has a few sticky/lazy lifters that make a bit of noise for a few seconds. So after I switched to the RP HMX, the sound is GONE. I couldn't be happier. The motor sounds much, much better and runs nice and smooth. I can't comment on longetivity, as I've only had it in my truck for a couple hundred miles. However, if it's anything like RP's gear oil and transmission fluid, then it will perform better than any other oil I could put in my truck. If you're on the fence about spending the extra $ on this premium high mileage oil, just do it. Plus you can extend your oil change intervals after just 2 short 3,000 mile oil changes! ... show more
Reviewed in the United States on July 8, 2015 by krivs388
Good oil
Size: 5 Quart, (Case of 3)
My go to oil since it doesn't cook off as fast as penzoil platinum. I drive a Miata with over 200,000 miles and so far so good
Reviewed in the United States on February 6, 2024 by Dylan E
Great product
Size: 1 Quart, (Case of 6)
I use this particular oil in my Honda EU7000is inverter generator. I started with regular royal purple at 100 hrs. At 1000hrs I switched to the high mileage version. I recently completed the 2000 hour service and the engine internals look brand new. Bearing wear was non existent and zero evidence of blow by. After measuring clearances I literally put the engine back together as-is. Keep in mind Honda does not use oil filters on these smaller engines. I change the oil every 200 hours and honestly it looks the same coming out as it does going in. I could probably go 400-500 hrs on a change but at about a quart per oil change it’s cheap insurance to just do it more frequently. I use royal purple products in my other small engines and vehicles and it has always performed excellently. ... show more
Reviewed in the United States on May 23, 2024 by W. Stevens
great price
Size: 5 Quart, (Case of 3)
Great price but it is listed as case of four(4) on the listing and in product description it says three when you buy so be aware of the description and what your ordering
Reviewed in the United States on February 4, 2024 by Misnurse
One of the best brands in the market
Size: 1 Quart, (Case of 6)
I take care of my vehicle with the best products.
Reviewed in the United States on August 11, 2024 by Amazon Customer
Best oil on the market
Size: 5 Quart, (Single Unit)
Works great for high mileage vehicles
Reviewed in the United States on February 29, 2024 by Michael Cali
Ah yes, forbidden grape juice.
Size: 5 Quart, (Single Unit)
I used this product in my 94 Toyota with a 3VZE engine, an engine not known for gas mileage or even being a silent running engine. I religiously change my oil every 3500 miles at maximum as highway driving is not the friendliest to these vehicles with their gearing. This oil went in a beautiful dark purple, and came out a modest dark caramel. I guess the purple breaks down as it ages. The oil could have had a longer life and it almost seemed like I was changing it prematurely. When I put this oil in, after 10 miles the engine would idle silently to where you could only hear the injectors firing. When driving the vehicle delivered an extra 3mpg on this oil compared to Mobil 1. I ended up having to go back to Mobil this oil change because timing didn't line up to get this, and none of my local auto stores even carry the HMX (though they should) just the regular. I highly recommend this to anyone looking at trying a new oil. Best oil I've ever used. Period. ... show more
Reviewed in the United States on August 26, 2022 by 2Stroke GoBrrrr
Muy bueno lo recomiendo mucho
Size: 5 Quart, (Single Unit)
Mi carro tiene mejor calidad con este aceite
Reviewed in the United States on July 18, 2024 by Eso no sirve no agarra nada de nada es una estafa
How it works
Checking for best price...