Changing the oil in your classic car the right way – with LIQUI MOLY

Changing the oil in your classic car the right way – with LIQUI MOLY

An oil change in classic cars is much more than just draining and refilling the engine oil. Older engines, in particular, benefit from a structured approach that cleans the engine, removes deposits, and provides long-term protection with modern additives. LIQUI MOLY offers a perfectly coordinated range for this: from engine flushes and high-quality oils to protective additives for the engine, fuel system, and transmission.

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1. Engine flushing – the clean start

Before adding fresh oil, it's worth flushing the engine. This removes deposits, sludge, and old residue that have built up over the years.

• LIQUI MOLY Pro-Line engine flush is added to the warm used oil shortly before draining.
• The flushing process cleans the inside of the engine, keeps oil channels clear, and allows the new oil to develop its full effect.

This step is particularly valuable for classic cars that have been standing for a long time.

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2. High-quality engine oil – the heart of the

After flushing and changing the oil filter, fresh oil is added. Robust multigrade oils are suitable for classic cars, as they provide a stable lubricating film even in fluctuating temperatures.

• LIQUI MOLY HD engine oils (e.g. 15W-40) are classics for historic vehicles.
• LIQUI MOLY Molygen New Generation oils or special Top Tec oils offer the latest additive packages if the engine is approved for them.

The choice depends on the year of manufacture and the engine's characteristics. Important: Always consider the manufacturer's specifications and the condition of the engine.

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3. Additives for the engine – wear protection and smooth running

In addition to the oil itself, additives offer decisive advantages:

• LIQUI MOLY Ceratec : A state-of-the-art ceramic additive that reduces friction, minimizes wear, and ensures smoother engine running. Ideal even for older engines.
• LIQUI MOLY MoS₂ Additive : The classic solid lubricant. Particularly proven in older engines operating with larger tolerances.
• LIQUI MOLY Oil Loss Stop : Can help with minor leaks in the engine by regenerating seals.

These additives are added directly to the fresh oil and distribute themselves as it warms up.

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4. Gasoline additives – protection for the fuel system

The fuel system of older vehicles also deserves special attention. Deposits on injectors or carburetors, condensation in the fuel tank, or low-quality fuel can cause problems.

LIQUI MOLY offers various solutions:

• Gasoline system cleaner : Removes deposits on valves, injectors or carburettors.
• Valve protection additive : Important for vintage cars without hardened valve seats when running on unleaded fuel.
• Gasoline stabilizer : Protects against fuel aging during extended periods of inactivity – a must for seasonal vehicles.

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5. Transmission additives – smooth gear shifts

The transmission can also benefit: Older manual or automatic transmissions in particular are sensitive to wear.

• LIQUI MOLY Gear Oil Additive MoS₂ : Ensures smoother gear shifts, reduces running noise and extends the service life of the gears.
• LIQUI MOLY Automatic Transmission Cleaner : Helps remove dirt and deposits from the transmission before an oil change.

This also ensures that the power transmission remains protected for a long time.

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6. Step-by-step procedure for changing the oil in a classic car

1. Warm up the engine so that the used oil is thin.
2. Fill with LIQUI MOLY engine flush and let it idle briefly.
3. Drain old oil , change oil filter.
4. Fill with fresh LIQUI MOLY oil according to the manufacturer's instructions.
5. Add additives : Ceratec, MoS₂ or oil loss stop as required.
6. Start the engine and let it warm up , the additives will distribute themselves.
7. Optional: Maintain the fuel system with LIQUI MOLY gasoline additives.
8. Optional: Change transmission oil if necessary and optimize with additive.

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Conclusion – All-round protection for classic cars

A simple oil change is often not enough to preserve the mechanical system in classic cars over the long term. With a LIQUI MOLY engine flush, you lay the foundation, with a high-quality LIQUI MOLY oil, you ensure lubrication, and with additives such as Ceratec, MoS₂, and fuel and transmission additives, you ensure long-lasting protection.

LIQUI MOLY offers a holistic system that is perfectly coordinated – so that your classic car runs reliably, shifts quietly, and provides long-lasting enjoyment.