Royal Purple 11750 HMX SAE 10W-30 High-Mileage Synthetic Motor Oil - 5 qt., Model:ROY11750

Ok. I'm starting to think about using this oil more. I just did and oil change on my 2500hd 6.0 gas engine. Noticed a more smooth idle and less lifter tick. But will wait and see how it holds up. But I like it so far

Very good quality oil. No problem at all with my 20 years old engine. Last also long, very happy with it.

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!

I was previously using RP 5W-30 HPS w/ Purolator Synthetic filter w/ 1qt of oil burnoff. After switching to this w/ the RP filter at 112K miles on a 98' Toy Corolla 4-spd. The noise disappeared & my car runs much smoother & quieter. I've tried 5W-30 API RP & Valvoline MaxLife Full Synthetic, this doesn't compare. Valvoline & RP API will burn-off. & Valvoline was very viscous compared to RP. (Update) I've noticed less oil burn-off than HPS, no more than a quart so far for my long oil drain intervals. I was getting an oil change every 6 months or twice a year (winter & summer) w/ HPS, & i commute to work. I expect my oil change intervals to be the same. But its also because i should've been using 10W-30 instead of 5W-30 for this heat & because my car is high mileage. My car's manual says i can either use 5W-30 or 10W-30. Don't completely trust what's said on the oil cap; instead trust what the owner's manual says. If u want your engine to last a long time, always use the thicker oil whenever possible & forget about the temporary fuel economy benefits of the thinner "recommended" oil. The same goes with tire inflation, don't overinflate more than 1-2psi extra if u hwy drive; if u city/mix drive then don't add an extra 1psi. It isn't available in any store in my high-desert town in AZ. I prefer the 5-qt. single jug instead of the 6qt. pack because i still have 2 qt.'s of 5W-30 HPS left that i don't wanna use & my car's motor only uses 3.9qts. And it's cheaper in the long run, unless u burn a lotta oil.

I’ve been running this Royal Purple HMX 10W-30 for a while now and I can confidently say it’s one of the best oils I’ve used. My engine runs noticeably smoother and quieter, especially on cold starts. You can tell right away it’s doing a better job protecting internal components. What really stands out is how well it holds up over time. Even after putting some miles on it, the oil still performs strong and doesn’t break down like cheaper options. I also like the added protection for higher-mileage engines—it gives peace of mind knowing everything is staying well-lubricated and clean. If you actually care about your engine and want something that performs consistently, this stuff is worth every penny. I’ll definitely keep using it.

Love

Best oil there is and the only type I buy! Lawn mower, pressure washer, cars, trucks, literally everything I own runs this one

well known for quality and brand name. i use royal purple in all my classic cars.

Hear good things about royal purple. I did an oil change on my father's 170k mile chrysler 300 using the royal purple. Seems OK. Now nice need one for transmission. Lol. Hate cars...

Good Soup