Question 1

What is a piston soak with Berryman B-12?

Accepted Answer

A piston soak is an engine decarbonizing method where Berryman B-12 Chemtool (#0116) is poured into each cylinder through the spark plug holes and left for 12–48 hours to dissolve carbon deposits and free stuck piston rings — without removing the engine.

Question 2

What do you save with piston soak vs disassembling the engine?

Accepted Answer

Piston soak with Berryman B-12 avoids full engine teardown. You save money (product from ~€12.90 vs thousands in workshop labour and parts), time (12–48 hours at home vs 1–3 weeks off the road), complexity (no head removal or timing), and reassembly risk. It targets carbon and stuck rings — not worn cylinders, broken rings or valve seal leaks.

Question 3

Can Berryman B-12 fix high oil consumption?

Accepted Answer

When oil consumption is caused by carbon buildup on stuck piston rings, a piston soak with Berryman B-12 Chemtool can significantly reduce burning oil. It does not fix worn rings, damaged cylinders, or valve seal leaks.

Question 4

Which Berryman product is used for piston soak?

Accepted Answer

Use Berryman B-12 Chemtool Fuel Injector Cleaner, part #0116 (444 ml can). Berryman Products officially recommends this product for piston soak — not the carb cleaner spray or total fuel system variants.

Question 5

How long should Berryman B-12 soak in the cylinders?

Accepted Answer

Minimum 1–2 hours per Berryman guidance; most users soak 12–24 hours or overnight. For severe carbon, 24–48 hours with a top-up is common. Evacuate fluid before starting the engine.

Question 6

Where can I buy Berryman B-12 in Europe?

Accepted Answer

pistonsoak.eu ships genuine Berryman B-12 Chemtool 444 ml bottles across the EU. Order online with courier delivery from Babatac EOOD, Bulgaria.

Question 7

How much Berryman B-12 do I need for a piston soak?

Accepted Answer

Typical 4-cylinder: 2–4 bottles (30–60 ml per cylinder, possibly two cycles). V6/V8: 6–12 bottles due to cylinder count and angled pistons. Use the dosage calculator on our shop page.

Question 8

Is Berryman B-12 the same as Sea Foam?

Accepted Answer

No. B-12 Chemtool uses high-strength solvents (acetone, toluene, etc.) for aggressive carbon removal. Sea Foam is petroleum-based and gentler — better for maintenance, less effective on hardened ring carbon.

Question 9

Do I need to change the oil after a piston soak?

Accepted Answer

Yes. Solvent leaks past the rings into the crankcase. Change oil and filter after the procedure, even if only a small amount entered the sump.

Question 10

Will piston soak damage my engine?

Accepted Answer

When done correctly on a sound engine, piston soak is widely used without issues. Risks include solvent on paint (B-12 damages clear coat), hydrolock if too much liquid is left before starting, and running with contaminated oil if you skip the oil change.

Question 11

What engines benefit most from piston soak?

Accepted Answer

Gasoline direct-injection (GDI) engines with carbon-related oil consumption: VW/Audi TFSI, BMW petrol GDI (e.g. N20/N55), Hyundai/Kia GDI, Toyota with oil consumption TSBs, and high-mileage petrol engines with gradual oil use increase. Do not use Berryman B-12 on diesel engines.

Question 12

Does pistonsoak.eu sell genuine Berryman products?

Accepted Answer

Yes. We sell authentic sealed Berryman B-12 Chemtool 444 ml (#0116). Babatac EOOD is an independent EU retailer, not affiliated with Berryman Products Inc.

Question 13

How is Berryman B-12 shipped in Europe?

Accepted Answer

Orders ship via EU courier from Bulgaria. Delivery times vary by country, typically 3–7 business days. Shipping cost is calculated at checkout based on weight and destination.

Frequently Asked Questions — Berryman B-12 & Piston Soak

Piston soak & oil consumption

What you save with piston soak

Buying in Europe

Fuel system use

Still have questions?