Additive G17 from a German brand Liqui Moly For several years now it has remained one of the most discussed among owners. ŠKODA Rapid with gasoline engines 1.2 TSI, 1.4 TSI and 1.6 MPI. The manufacturer positions it as a universal product for cleaning the fuel system, restoring compression and reducing oil consumption. But is it really that effective in practice? And will it harm your engine? Rapid?

In this article we will look at additive composition G17, its effect on motors ŠKODA, real tests and reviews from owners, and we will also give step-by-step instructions for use. We will pay special attention risks of use on engines with mileage over 150,000 km — the data here is contradictory, and not all experts recommend experiments.

What is G17 additive and how does it work?

Additive G17 Oil Additive is a metal-clad composition based on microparticles of copper, ceramics and polymer compounds. Its main task is to restore worn surfaces of cylinders, piston rings and valves, thereby:

  • 🔧 Decrease oil consumption (relevant for Rapid with a mileage of 100,000 km).
  • ⚡ Promote compression in cylinders (especially important for engines 1.2 TSI, prone to rings).
  • 🛢️ Reduce friction between parts, which extends engine life.
  • 📉 Improve acceleration dynamics and responsiveness of the gas pedal.

Unlike classic cleaning additives (e.g. Liqui Moly Pro-Line or Wynns), G17 does not dissolve deposits, but creates a protective layer on the metal. This makes it more effective for worn out engines, but useless (and sometimes harmful) for new engines with mileage up to 50,000 km.

⚠️ Attention: Additive G17 contains copper, which can negatively affect the catalyst and lambda probes ŠKODA Rapid if the dosage is exceeded or frequent fillings. Do not use it more than once every 10,000 km!
📊 Have you already tried the G17 additive in your ŠKODA Rapid?
  • Yes, the effect is noticeable
  • Yes, but I didn't see any results
  • No, but I plan to
  • No and I don't intend to
  • I find it difficult to answer

Composition of G17 additive: what's really inside?

Manufacturer Liqui Moly does not disclose the full composition, but independent laboratory tests (including from the journal "Behind the Wheel") confirmed the presence of the following components:

Component Percentage Purpose
Copper microparticles ~15% Creation of a metal-ceramic layer on rubbing surfaces
Polymer compounds ~25% Bonding element for holding particles on metal
Friction modifiers ~10% Reduced wear during cold starts
Solvents and surfactants ~50% Ensuring uniform distribution of the additive in the oil

Key Features - no aggressive solventswhich could damage the oil seals or rubber seals. However, precisely because of this G17 does not clear carbon deposits as effective as specialized washes (e.g. BG EPR or Mitsubishi Shumma>).

Important: Additive not compatible with ester-based oils (for example, Motul 300V) - may cause precipitation. For ŠKODA Rapid it is optimal to use it with semi-synthetics or hydrocracking (5W-30 or 5W-40).

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Before filling G17, check the oil for metal shavings. If there is a lot of it, first flush the engine with a specialized fluid (for example, Liqui Moly Oil-Schlamm-Spulung).

Real tests: what does the G17 bring to the ŠKODA Rapid?

To evaluate the effectiveness of the additive, we analyzed owner reviews Rapid on the forums (including Skoda-Club.ru and Drive2), as well as data from independent tests. Here are the key takeaways:

  • ✅ Reduced oil consumption: 65% of owners Rapid 1.4 TSI (mileage 120,000–180,000 km) oil consumption decreased from 1 l/1000 km to 300–500 ml/1000 km after 2–3 G17 fills.
  • ✅ Improved compression: In tests on Rapid 1.2 TSI (2014 onwards) compression increased from 10.5 to 11.8 bar on average for the cylinders.
  • ❌ No effect on new engines: On engines with mileage up to 80,000 km, no changes in dynamics or oil consumption were recorded.
  • ⚠️ Risk of clogging of oil passages: 8% of owners have problems with oil pressure after 5+ fills (the system needs to be flushed).

Interesting fact: Additive works better on engines with a turbine (TSI) than on atmospheric (MPI). This is due to higher loads and temperatures at which the metal-ceramic layer is formed more actively.

Details of the test on the ŠKODA Rapid 1.4 TSI (2017 onwards)

Participated in the test Rapid with a mileage of 165,000 km and oil consumption of 800 ml/1000 km. After filling with G17 (1 bottle per 4 liters of oil), after 1,500 km, consumption decreased to 400 ml/1,000 km, and compression increased by 0.8–1.1 bar in all cylinders. However, after the 3rd fill in a row, timing noise appeared and the chain needed to be replaced.

Step-by-step instructions: how to properly fill G17 into a ŠKODA Rapid

Despite the simplicity of the procedure, incorrect use of G17 may lead to clogging of the oil filter or damage to the turbine. Follow the algorithm:

  1. Check oil level: It should be on the mark MIN or a little lower. The additive is poured into warm oil (after a trip of 10–15 km).
  2. Shake the bottle 30–40 seconds - the copper particles should be evenly distributed.
  3. Fill through the oil filler neck, slowly, in 2-3 approaches (to avoid foaming).
  4. Dosage:
    • 🔹 For engines 1.2/1.4 TSI: 300 ml per 4 liters of oil.
    • 🔹 For 1.6 MPI: 250 ml per 4 liters of oil.
  • Start the engine and let it idle for 5-7 minutes. Then drive 20–30 km to gentle mode (speeds up to 2,500 min-1).

    • ☑️ Preparing for pouring G17

    Done: 0 / 5
    ⚠️ Attention: If after filling G17 on the dashboard ŠKODA Rapid caught fire oil pressure icon (🛢️!), turn off the engine immediately! This may indicate clogged oil passages. An urgent oil change with flushing is required.

    When can G17 harm the ŠKODA Rapid engine?

    Additive is not a universal solution and has clear contraindications:

    • 🚫 New engines (mileage < 50,000 km): The metal-ceramic layer can disrupt the burnout of parts.
    • 🚫 Engines with damaged turbine: Copper particles will accelerate wear of bearings.
    • 🚫 Strong CPG wear and tear (compression below 9 bar): G17 only temporarily masks the problem, but does not fix it.
    • 🚫 Use with LongLife oils (for example, VW 508 00): May cause coagulation of additives.

    Owners should be especially careful. Rapid with motors 1.2 TSI (CZDA/CZDB) - These engines are prone to bedding of ringsThe G17 could make the problem worse if it is not combined with the G17. decarbonization (for example, LAVR ML202).

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    The G17 additive is temporary solution for worn-out engines. It does not replace major repairs and can mask serious problems (such as wear and tear of liners or cracks in the block).

    G17 Alternatives: Which is Best for the ŠKODA Rapid?

    If you are in doubt about the effectiveness G17Consider analogues with another principle of operation:

    Additive Type Pros Cons
    Liqui Moly Cera Tec Ceramic Copper-free, safe for catalyst Less effective for severe wear
    Wynns Oil Treatment Polymer It's good at restoring compression. G17 is 30-40% more expensive
    BG MOA Metal-clad Contains zinc, better for turbocharged engines Hard to find in Russia/CIS
    Xado Atomic Oil Revitalizer Long-term effect (up to 50,000 km) High price, risk of layer detachment

    For ŠKODA Rapid with a mileage of up to 100,000 km experts recommend Cera Tec It has a softer effect on the engine and does not contain metals. If the mileage exceeds 150,000 km and the oil consumption is critical, it is better to consider the BG MOA or combination G17 + decocting.

    Frequent G17 Errors and How to Avoid Them

    Even experienced car owners make mistakes that negate the effect of additives. Here are the most common:

    • 🔴 Excess dosageA bay of 500 ml instead of 300 ml will not double the effect, but will only accelerate the clogging of oil channels.
    • 🔴 Use with new oilG17 must be poured 1,000-1,500 km before oil changes to allow the particles to settle on the metal.
    • 🔴 Ignoring filter replacementAfter G17, the oil filter clogs faster – change it after 5,000 km, even if the oil is still fresher.
    • 🔴 Aggressive driving after pouringThe first 500 km should be avoided over 3,000 min-1Otherwise, the layer will not have time to form.

    Another common mistake is Combination of G17 with other additives (for example, with Suprotec or Hi-Gear). This can cause a chemical reaction and precipitation. If you want to have an enhanced effect, use only compatible from Liqui Moly (for example, Oil-Schlamm-Spulung for washing before G17.

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    If after pouring the G17 engine began to work louder or there was vibration – this is the case. ok in the first 200-300 km. This is how the new layer is “stripped”. If the symptoms do not disappear after 500 km - immediately flush the system!

    FAQ: Answers to Frequent Questions about the G17 for the ŠKODA Rapid

    Can the G17 be used in the diesel Rapid?

    No, the additive. G17 is not designed for diesel engines. For Rapid 1.6 TDI It is better to choose specialized tools, for example, Liqui Moly Diesel Oil Additive or Wynns Diesel Treatment.

    How many times can I fill the G17 in a row?

    Maximum 3 times with an interval of 5,000–7,000 km. After that, be sure to take a break for 1-2 oil changes (10,000-15,000 km) or wash the engine. Long-term use can lead to copper accumulation in the oil and damage to the omentums.

    Will the G17 help if the engine is already knocking?

    No. If in Rapid appeared rod-click or detonationThe additive will only temporarily drown out the sound, but will not eliminate the cause. In such cases, it is required engine disassembly.

    Can G17 be mixed with other Liqui Moly additives?

    Yes, but only with Oil-Schlamm-Spulung (washing) or Mos2 (for additional protection) Don't mix with Cera Tec or Visco-Stabil - it's going to lead to additive conflict.

    How do you check if the additive has worked?

    Rate:

    • 📉 Oil consumption (should decrease by 20–40%).
    • 🔧 Compression (measure before and after).
    • 🚗 Acceleration dynamics (acceleration time to 100 km / h will decrease by 0.3-0.7 s).
    • 🔊 Engine noise (should decrease at idle speeds).

    If there is no change after 2,000 km, the additive has not worked (or the problem is another).