BARDAHL 120039 TOP DIESEL+ 1 L - Multifunctional Diesel Additive, cleans and lubricates injectors

Capacity: 1 L

BARDAHL 120039 – TOP DIESEL+ 1 L

Bardahl Top Diesel+ 120039 is the multifunctional diesel additive in the 1-litre size: it equals four standard 250 ml treatments or one Power Boost treatment in a single tank. It cleans the fuel system, lubricates the pump and injectors and raises the cetane number. It is the cost-effective choice for regular Top Diesel+ users and for workshops.

What it is for

Bardahl recommends Top Diesel+ when the car shows one or more of these symptoms:

• irregular idle;
• poor performance;
• hard starting;
• black exhaust smoke;
• higher fuel consumption.

The possible causes listed by Bardahl are dirt building up in the fuel system, biodiesel or low-quality fuel, water in the fuel and the poor lubricity of diesel, which over time wears the injectors and high-pressure pump.

Benefits

• ✅ Cleans deposits from the fuel system and prevents new ones from forming
• ✅ Keeps injector holes clear for correct diesel atomisation
• ✅ Lubricates the high-pressure pump and injectors
• ✅ Protects the system over time from the effects of water (corrosion and rust)
• ✅ Raises the cetane number and stabilises the fuel
• ✅ Improves engine efficiency, helping to save fuel and reduce polluting emissions
• ✅ 1-litre size: four standard treatments or one Power Boost treatment

Dosage and directions

• Standard treatment: 250 ml in a full tank of diesel (about 60 litres): the 1-litre bottle is enough for four treatments.
• Frequency: every 2-3 fill-ups or at least every 4,000-5,000 km.
• Stubborn deposits or loss of performance: Bardahl allows two consecutive treatments.
• Power Boost: 1 litre of product in one full tank for immediate cleaning and, according to Bardahl, a power gain of up to 1.7%.

Add the dose to the tank when you fill up.

Technical specifications

• Brand: Bardahl
• Product code (MPN): 120039
• Line: Top Diesel+ (COD 120)
• Size: 1-litre bottle
• Dosage: 250 ml for about 60 litres of diesel (standard treatment) or 1 litre in a full tank (Power Boost)
• Frequency: every 2-3 fill-ups or at least every 4,000-5,000 km
• Type: multifunctional diesel additive (cleaning, lubricating, anti-corrosion, cetane improver)
• Compatibility: all diesel engines, naturally aspirated and turbocharged, common rail and unit injector

Compatibility

Bardahl states that Top Diesel+ is suitable for all diesel engines, naturally aspirated and turbocharged, with indirect or high-pressure direct injection (common rail and unit injector). Use with diesel fuel only: Bardahl offers dedicated products for petrol engines.

When it does not help: an additive cleans and protects but does not repair an injector with a mechanical or electrical fault, nor an already damaged pump. If the ECU reports an injector fault, a workshop diagnosis is needed first.

Pair it with

• Bardahl 120018 Top Diesel+ 250 ml: the same product in a 250 ml single dose, handy to keep in the car.
• Bardahl 122031 Diesel Injector Cleaner 500 ml: concentrated shock treatment for the injectors.
• Bardahl 113018 DPF Cleaner 250 ml: to keep the diesel particulate filter clean.

Frequently asked questions

How many treatments does the 1-litre Bardahl Top Diesel+ give?
At the standard dose of 250 ml per full tank of about 60 litres, the 1-litre bottle of Top Diesel+ is enough for four treatments. Alternatively, the whole litre can be used in one tank for the Power Boost treatment.

What is the Bardahl Top Diesel+ Power Boost treatment?
It means using 1 litre of Top Diesel+ in a single full tank: according to Bardahl this gives immediate cleaning and a power gain of up to 1.7%.

How often should I use Bardahl Top Diesel+?
Bardahl recommends one treatment every 2-3 fill-ups or at least every 4,000-5,000 km.

Can Top Diesel+ be used twice in a row?
Yes. With stubborn deposits or loss of performance, Bardahl allows two consecutive treatments.

Is Top Diesel+ suitable for common rail diesel engines?
Yes. Bardahl states it is suitable for all diesel engines, naturally aspirated and turbocharged, with indirect or high-pressure direct injection, including common rail and unit injector.

Can Top Diesel+ be used with biodiesel?
Yes. Bardahl lists biodiesel and low-quality fuels among the causes of fouling that Top Diesel+ counteracts.

Is the 1-litre or the 250 ml size better value?
The product is the same. The 1 litre (120039) suits those who treat their diesel regularly or want to do the Power Boost; the 250 ml (120018) is the single dose for one tank.

What is the difference between Top Diesel+ and the Bardahl Diesel Injector Cleaner?
Top Diesel+ (COD 120) is a multifunctional maintenance treatment. The Diesel Injector Cleaner (COD 122) is a shock treatment for the injectors: 500 ml in 20 litres of diesel, every 5,000 km or before the emissions inspection.

Does Top Diesel+ also clean the particulate filter?
Top Diesel+ works on the fuel system. For the particulate filter Bardahl offers the DPF Cleaner (COD 113) or the 5-in-1 Diesel Cleaner (COD 166), which also works on DPF, EGR, turbo and catalytic converter.

Does Top Diesel+ protect diesel from freezing?
No, it is not an anti-gel. For cold weather Bardahl offers Hot Fuel (COD 121), which inhibits the formation of paraffin crystals.

Does Top Diesel+ repair a faulty injector?
No. It cleans deposits and lubricates, but does not fix mechanical or electrical faults: those need a workshop diagnosis.

Why buy from Autoricambi Tritella

Since 2007 we have supplied workshops and drivers through 4 stores in the province of Teramo, Italy (Giulianova, Mosciano Stazione, Roseto degli Abruzzi, Nereto). Genuine Bardahl products, fast shipping and technical support: if you are unsure which product suits your car, contact us before buying.