Very good for washing, but not quite enough to completely clean the rings, at least in my case

This is a amazing product. Cleans the engine really good.The performance of this car now is great.

Good product and good for car crank case.

I used this in the fall to clean my VW Tiguan Wolfsburg TFSI 4Motion engine. I was having noises and excessive oil consumption the past two years. This is a great product and after 3000 kms in Canadian fall/winter it did the trick. Less noise and much improved oil consumption. I recommend buying the pack of 4; great value! When flushing the engine do it right. On these TFSI engines you need to change oil every 5000 kms to avoid carbon particles damaging your engine. My car just turned 100,000 kms so going forward i plan to flush every year in the late fall as a winter prep. Also check your spark plugs. I flush the old oil first but kept the oil filter. Then I put cheaper conventional oil (not synthetic) and added ERP to that., ran for 15 min at high idle per recommendations. You can really see the engine cleaning performed from the oil colour. Do this during daytime. Then I flushed this oil out and replaced the oil filter. Finally filled with synthetic oil 5W40 Euro. The car never sounded better. I also recommend checking PCV valve at 100,000 kms or sooner. It will avoid major engine problems and of course unnecessary oil consumption.

Take your car for a spin before you add BG to heat up your engine. BG is heat activated in your oil. I ran the BG for a half hour in my vehicle. Ran the RPMs up to about 1000 for 25 minutes. Every five minutes I would Rev it up to 2000 3000 RPMs and then let it go back to 1000 RPMs. At 25 minutes I let the car idle normal to filter out the clumps if there were any. BG says to run the chemical in the oil for a minimum of 10 minutes at 1200 RPMs. My son’s Toyota Camry has 167,800 miles and is consuming oil. My theory is that the oil rings are sticking and not moving at all. I’m hoping this chemical frees up the rings so that they can move in and out to prevent oil burning in the future. Time will tell. I only use Mobil 1 in this engine and so I’m confident that it’s not very bad in the inside of the engine. I recently had the valve cover off and it was very clean inside the engine. I’m very confident that this product did some good in my engine because the oil came out super black. Never ever drive your vehicle with this BG chemical in the oil. My advice heat up your car engine so that this chemical can work right away. Don’t just add those to a cold engine and let it run inside of it for only 10 minutes because that would be a waste of money and wouldn’t work as well. It’s been 2 weeks since the review above. The oil has remained very clean and hasn’t gotten dirty yet. Before it wound get dark immediately. Car seems smoother and I believe the MPG went up. It’s my son’s vehicle took it on a 100 mile spin going to an A@W by myself with out him. Hasn’t used oil yet but it’s only been 2 weeks.

I purchased a 4-pack of cans. Product arrived with only 3 cans and the pack was obviously damaged. Amazon corrected the issue overnight and I used the product the next day. Works as advertised and the seller can't be beat. Thank you!!

I’ve used this on all of our gas engines with amazing results. I just did it to my duramax and the oil is noticeably cleaner!!! Usually after an oil change it’s black as night almost instantly. This pic is a substantial improvement after using the product and doing a fresh oil change in a Diesel engine!!

One of the few "mechanic in a bottle" that can actually help. Even fresh oil will come out dark with this added to it which confirms EPR can break down deposits in the crankcase.

The product works

Both my vehicles run so much better with this addition to the fuel.

I'm a master mechanic and I was introduced to this product at the dealership I worked at. We tested it to make sure it really boosted compression by freeing up the rings on the pistons. Used as directed and it restored compression back to our 2001 Maxima test vehicle. I have also used this product in my Jeep Wrangler JK and JKU to stop the oil consumption. I've used it in my 1990 Civic, 1997 Camry, and 2006 Silverado to clean out sludge from previous owners' neglect and restore compression. This product is by far the best. Better than AC Delco top engine cleaner, Marvel mystery oil, other flushes, etc. The only thing I recommend about this product is the longer you run your engine, the cleaner it will get (e.g. follow directions but run for 30 minutes instead of 10). I also recommend using the MOA product.

I was skeptical but it does work. My 2000 Tahoe developed a lifter tick that was getting worse. After running this stuff it cleaned out my sticky lifter. No leaks, but it is stinky stuff when you drain it out.

These chemicals (BG) seem to me to work very well. I have no definitive/absolute proof but having worked on autos/engines since the 70's that's my personal assessment. I think these products are far more effecive than most retail junk sold at parts stores.

I love this stuff, used it on my c5 vette just turned 95k and wanted to do more than just oil change. Ok changed oil , drove almost 2 weeks on oil , oil didn't change color, I mean clear like first oil change. Engine runs smoother. I would recommend this to everyone I know.

We have done one treatment of the EPR so far on our 2012 GMC Terrain and I'm impressed. With the EPR added, I ran the engine for 25 minutes at 1200 rpm. Drained the blackest, thinnest oil ever. With fresh oil and filter, we are now over 1200 miles and the oil level on the stupid wire thing they call a dip stick hasn't moved yet! It would have been almost a quart low by now. I will update this review as the miles progress. But wow what a start!