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

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

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

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.

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

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.

item is top notch amazon best place to buy

I'll tell you why. I was running Mobil 1 High Mileage in my 1990 Dodge Dakota with about 300,000 miles on it. It was due for a change so I fed it the Purple and gave it the matching filter just 2 days ago. All the engine noise has completely disappeared. There was lifter knock, now not a peep. Oil pressure is straight in the middle of the L and H, even with the fresh Mobil 1 I'd only reach 1/3 across the gauge and less when it got hot. RP is straight up on the gauge all the way to work and back. ~$7.50 a quart to keep my old Dodge alive for another few years is a bargain, and Royal Purple is the best oil money can buy. Backstory: The reason I switched my truck over to RP is because I did it to my wife's 96 Dakota first. Her's got the 10W-40 HPS. The oil pump is/was worn in her truck and oil pressure was low. I took her truck to a mechanic who tried to clean all the gunk out, but oil pressure remained low, so he changed the oil to 10W40 (cheap stuff) and added a quart of Lucas. That kept her oil pressure just above the L when hot. A few months later I changed her over to RP and her oil pressure problems were solved, and her engine runs quiet and smooth. No more Lucas, no more oil warning lights. Going forward, I'll never use another brand of motor oil (unless RP gets bought out by the Chinese or something) in any of my vehicles. It's worth every penny.

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...

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