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Royal Purple

Royal Purple HMX Premium Synthetic High Mileage 5W20 Motor Oil - 5 Quart

$146.97 $139.59 Save $7.38

SKU: R022 37518

In Stock
In Stock
Ships by Jun 20
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Non-Returnable Item

Description

The Royal Purple 37518 is a HMX Premium Synthetic High Mileage 5W20 motor oil. It features advanced Synerlec technology for exceptional film strength, reducing friction for peak engine performance. This formulation also provides outstanding oxidation resistance to extend oil drains and maintains an ionic attraction to metal components, minimizing start-up wear.

Fitment

Fitment Guaranteed

Don’t gamble
on fit.

Log your build in the MOTORMIA app and we’ll guarantee this part fits your exact setup — or your money back, return shipping covered.

Available on iOS & Android

Specifications

BrandRoyal Purple
Part NumberR022 37518

Videos

What has royal purple done to my engine? Should you switch your oil to Royal purple? (Part 1)

What has royal purple done to my engine? Should you switch your oil to Royal purple? (Part 1)
The Truth About Royal Purple Engine Oil for Your Car

The Truth About Royal Purple Engine Oil for Your Car
Long Term Royal Purple Motor Oil Experiment (Part 1 - Setup)

Long Term Royal Purple Motor Oil Experiment (Part 1 - Setup)
Toyota Tacoma V6 engine using Royal Purple oil

Toyota Tacoma V6 engine using Royal Purple oil
Royal Purple 5000 Mile Results Are in - Let's Check It Out - Was it any good or Just Decent Oil

Royal Purple 5000 Mile Results Are in - Let's Check It Out - Was it any good or Just Decent Oil
Pennzoil Platinum Engine oil VS Royal purple HPS Full synthetic

Pennzoil Platinum Engine oil VS Royal purple HPS Full synthetic
Royal Purple HMX - Why I chose to use it

Royal Purple HMX - Why I chose to use it
Royal Purple Vs Mobil 1 Motor Oil: Which One is The Best? [2025]

Royal Purple Vs Mobil 1 Motor Oil: Which One is The Best? [2025]
Motul 8100 EcoEnergy vs Royal Purple HPS 5w30 shocking results Full Synthetic Oil

Motul 8100 EcoEnergy vs Royal Purple HPS 5w30 shocking results Full Synthetic Oil
Is Royal Purple really worth all the hype? 5,100 miles with Royal Purple XPR performance racecar oil

Is Royal Purple really worth all the hype? 5,100 miles with Royal Purple XPR performance racecar oil

Buy with Confidence

Built for enthusiasts. Every order is backed by our 30 day return window on eligible items. Unused and uninstalled products may be returned with approved RMA and no restocking fees when received in new condition. Orders placed through the MOTORMIA app with a complete build qualify for our Fitment Guarantee — free return shipping if the part doesn’t fit your exact setup. The guarantee covers fit only; installation must follow manufacturer instructions, and we recommend a qualified shop for parts marked Difficulty 4–5.

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