Piston Soak: BMW #82140428376 vs AcDelco X66p

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CA
If the Valvoline Premium Blue Restore does not work, I am interested in performing a piston soak on the spouse's Accord. AcDelco X66p was supposed to be very good for this purpose but the product is discontinued. Rumor is that BMW sells a very similar product - it is coincidentally sold in the same style bottle and happens to be the same color: https://www.eeuroparts.com/Parts/46712/Fuel-Injection-Cleaner-Concentrate-82140428376/ Does anyone know if the two products are similar?
 
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2,560
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wv
This is the new stuff https://www.amazon.com/ACDelco-10-3015-Engine-Injector-Cleaner/dp/B07CZ17LK3 Here is a review As soon as I poured this stuff into the spark plug holes, the clear liquid turned black, and the drips on spark threads turned the black carbon into shiny metal. It literally melted the carbon. I sucked out the liquid, and the carbon debris clogged my sucking tube. I can't believe how much crud has come out from the pistons. I followed the soak with MMO to flush out the carbon debris until the liquid turned to clear red, and cranked the engine (with a towel covering the holes) to blast the carbon pieces out. My car has stopped burning oil. A miracle!
 
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3,341
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Madiganistan/ChiRaq
That review is unreal. I also tried a piston soak in my 2008 accord using seafoam, MMO, I had a dry plug #1 I think after cranking After sitting about 2 days I did manage to get the 1st hole to be wet. If this works for you I may try it.
 
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Messages
313
Location
D-FW, Texas
Just did a piston soak on the '03 Accord 2.4L (154k mi) using the BMW Fuel Injection Cleaner Concentrate p/n 82140428376 (same as referenced in @The Critic's OP but ordered from BMW of South Atlanta for $32 delivered). Previously I was running Supertech 5w30 conventional HM at a run rate of a quart every 1200 mi. After comparing other posts from this and other boards, the most convincing evidence that the BMW and X66P substances were the same/similar was the ACDelco X66P SDS referencing the same components listed on the back of the BMW cleaner: Glycol ethers and Aryl alcohol. That and of course the bottles/fluid look identical and reference the same limitation to not add to the fuel tank. I largely followed the procedure listed on the drive accord site for the x66p soak. Warmed the engine up to 130F ECT and initially poured 2 oz / cylinder then added an additional ounce ~ 5 hours later. After ~ 3 more hrs I pulled the fuel pump relay/fuse and started cranking with the plugs out. Below photo shows round golden fluid stain on all 4 cylinders, almost reminicent of clean oil (I did this before the oil change). No observed carbon crud. I did find a reference to a GM service procedure not to piston soak for more than 3 hrs since it could result in dissolved deposits reforming. The aftermath: After sitting overnight (ambient temp in garage was 55F) I drained the oil and replaced with ST 5w20 conv and a new Bosch 3323. Chose to refill with 5w20 since I should know soon if I have reduced the oil consumption. A few more cranks with the plugs out to get any remaining fluid out then reinserted the plugs and fuse. That's where it got interesting. It took a few attempts turn over / start and idle was a bit rough, perhaps I didn't get all the fluid out. All the while it was spewing out more white smoke than the Blue Angles in a diamond formation LOL. After a few minutes of idling up to temp, the smoke subsided and it drove without hesitating for a 15 mi Sunday drive. I'll update if this works, but in hindsight and considering all the hassle, just dumping a quart of oil once a month isn't that bad! [Linked Image] [Linked Image]
 
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