Restore (00016 8-Cylinder Formula Engine Restorer & Lubricant - 16 oz.

Absolutely yes. I've got a second hand 2500 Yukon XL with an 8.1 and it came to me with a rough idle and check engine light with codes for misfire on #1 and &#3. That's the drivers side two front plugs. I pulled the plugs and found some of the ceramic insulator chipped away on both those plugs(towing on cheap low test pump gas in southern USA heat with a large plug gap makes spark-knock and this vortec is just like the smaller ones in they don't appreciate spark knock, this is probably what killed the ceramic insulators). I pulled the rest but they all looked fine. I compression tested and found #1 was 60#'s less than the average (the rest were all within like 17psi of one another((the average was something around 200 or 205)) and #3 was 20#'s less than the average of the rest. I replaced the plugs, gapped them .020 tighter than the sticker says (there's a service notice about using a smaller gap to improve idle and reduce missfire codes) and cleared the codes. Idle improved greatly but it was still noticeably missfire at an almost regular rate. And the miss went away as soon as a little throttle was applied. I added an 8cyl bottle of Restore in I had (I already researched a lot before I bought the truck and had stuff in my amazon cart). I fired the truck and by the time the idle settled down to its low idle it used to miss at, it was silky smooth. I did a good test rip out in the cornfield loop by my house for about 8 miles and came home with a very big smile on my face as a very happy big block owner. I tested all the cyls and the average had raised by about 10psi and both bad cyls came up to about 7 psi of each other and of the average.I now run a bottle in it every year unless I tow a lot in the summer, then 2x a year. If I go 2 oil changes without it, or about a year, I start to notice its less punchy and it starts to get a little random idle stumble. Not even a miss fire but just a very random stumble. I give this product 12 of ten. I have a lot of experience with using it to bring free junk small engines I get for free, back to life. This stuff even works in splash lubed small engines! It keeps amazing me.

Works great. Does what it says on the can! This product literally restored our 1972 Dodge Dart's 318 motor. Noticeable difference from day one and every drive after just got better and better. The 318 had some serious compression issues but after 3 cans of the magic product it is running like new - really - totally amazing. Makes one wonder how many beautiful old cars would still be on the road if this product was a main-stream recognized item. So impressed I used it on my 1995 BMW 525i and 1984 Toyota Sunrader 22R motor. All my cars run much better, smoother and use much less gas after using this BRILLIANT product. VERY Highly recommend. A++ 10 Stars!

I never bother to write reviews. Escalade 143K miles. Out of nowhere we ere sitting in line at Whataburger when the truck suddenly started misfiring and shaking. The check engine light started flashing off and on and the anti-skid system light came on. I just happened upon this additive on Amazon, read the reviews and said WTH! I’ll give a try. Delivered to my door the next evening. I had my doubts, but I poured this product into the oil filler and started it up. Right away the misfire and shaking was almost totally gone. Drove it and it drove really smooth at highway speed. It did misfire just a little at idle but the change was incredible. The check engine light came back on. I went and had all my compressions checked and all 8 were way low. So I’m probably going to rebuild the engine. BUT this stuff absolutely works! I would HIGHLY RECOMMEND this product if the misfire is not too bad or if your compression is pretty good. It will definitely be worth trying. It really is a mini-overhaul and tuneup in a $10 can. It works!

Reduced oil consumption.

I've been using Restore in higher-mileage (60K+) vehicles for many years now. Admittedly I have no way to measure its effectiveness on the engines of these vehicles, but I can tell you the engines still run very smoothly, don't burn oil, and still seem to have that "new car" power and acceleration. I'll continue to use this stuff as it's not much more expensive than synthetic oil.

Love this stuff

I didn't run a compression test before or after, but I can tell you I noticed the immediate difference in the way the truck ran after pouring this in. I had more power, my fuel economy picked up three to four miles per gallon, the engine was quieter. The truck can now spin the tires on dry ground, this is pretty impressive. It's only a 318, and a full size bed truck with extended cab. The truck has less than $150,000 miles on it.

Are use this in every car that I bought that had high mileage Amazon has it for the cheapest price everywhere else is five to $10 more. I use this every three months with an oil change they give my car/truck are more power compression. I have worked on cars for 30 years. I used it in my Lexus my Toyota both my dodges untell I sold them and my 1999 GMC full size suburban I still dive it’s worth the money!!! Ease to use don’t need a filter to put in