STP Complete System Cleaner Diesel (MPN 503) 300 ml

Name: Fuel System Cleaner STP Complete 503
Brand: STP
SKU: 11775916
Price: 27.99 EUR
Availability: InStock

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Fuel System Cleaner STP Complete System Cleaner Diesel, bottle 300 ml (MPN 503)

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Short description

STP Complete System Cleaner Diesel is a diesel fuel system cleaning additive designed to treat injectors, pumps and combustion chambers. Supplied in a 300 ml bottle (MPN 503), it helps remove deposits, improve fuel atomization and stabilize combustion to reduce smoke and rough idling. Suitable for periodic maintenance and troubleshooting diesel engine drivability issues.

Available for order: 1 pcs.

Warranty: 2 Years

SKU: 11775916

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to the Customer Service Center at Kengaraga 2b, Riga

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2b. Kengaraga str., Riga, Latvia, LV-1063

10.07.2026 {{selectedOffer.officeDeliveryString}}

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Payment Methods:

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Product information

Description

STP Complete System Cleaner Diesel in a 300 ml bottle is an additive formulated to clean diesel fuel systems by treating injectors, pumps and combustion chambers. The formulation is intended to remove carbon and lacquer deposits, improve fuel atomization and help stabilize combustion, which can reduce visible smoke and rough idling. The product is supplied by the STP brand for use during periodic maintenance or when addressing drivability symptoms in diesel engines.

Advantages

The cleaner targets deposits across the fuel system so it can improve injector spray patterns and restore more consistent fuel delivery. By assisting combustion stability and deposit removal in combustion chambers, the additive can contribute to reduced smoke and smoother idle. The concentrated 300 ml bottle provides a measured dose suitable for treating one fuel tank or performing targeted maintenance, and it is compatible with typical diesel fuels when used as directed.

Suitable for

Diesel passenger cars and light commercial vehicles
Periodic fuel system maintenance and preventive care
Troubleshooting rough idling, excessive smoke or reduced power related to deposits
Injectors and high-pressure fuel pump maintenance support

Key specifications

Form: liquid additive in 300 ml bottle
Target systems: diesel fuel injectors, pumps and combustion chambers
Main function: deposit removal, fuel atomization improvement and combustion stabilization
Application: single-dose treatment for a full fuel tank or targeted maintenance depending on vehicle capacity

How to use

Pour the entire contents of the 300 ml bottle into the vehicle's diesel fuel tank before refuelling, or follow the vehicle manufacturer and product label instructions for dosing based on tank capacity. Operate the engine under normal conditions after treatment to allow the cleaner to circulate through injectors, pump and combustion chambers. For best results on heavy deposits or persistent symptoms, repeat treatment at intervals recommended on the product label or during scheduled maintenance.

Usage recommendations

Use the product as part of routine maintenance every few thousand kilometres or when symptoms of fuel system deposits appear. Avoid over-dosing and always follow the instructions printed on the bottle and any guidance from the vehicle manufacturer. Store in a cool, dry place away from direct sunlight and sources of ignition.

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Customer questions

FAQ

How much does the STP Complete System Cleaner Diesel (MPN 503) 300 ml cost, and is it available for purchase?

The price is 27.99 € (valid at the time of publication and already includes all taxes). The item is available for order — 1 pcs. are in stock, and you can place your purchase right now with delivery across Latvia and Europe or choose pickup at the Riga collection point. We offer favorable purchase terms, including the option to split the payment into convenient monthly installments. Availability and price are updated in real time, so we recommend placing your order in advance.

If I order this product today, when will I receive my order?

If you place your order today, delivery will be as fast and convenient as possible. You will be able to pick up your order on 10.07.2026 at the Riga pickup point or choose delivery across Latvia and Europe. We carefully inspect every purchase and pack it securely for safe transportation.

What payment options are available?

AiO.lv offers several payment methods: Bank transfer, Bank cards on-line, Apple Pay, Google Pay. All transactions are 100% secure and encrypted.

Can this product be purchased for a company (with VAT)?

Yes. AiO.lv works with legal entities in Latvia and across Europe. The product price already includes VAT. For certain product categories, as well as for companies from other EU countries with a valid VAT number, a 0% VAT rate may apply. We issue the invoice immediately after the order is placed, support electronic BIS invoices, and automatically generate all necessary accounting documents. You can complete the purchase for a company online — simply select the company profile and choose bank transfer as the payment method during checkout.

What is the warranty period?

All STP products come with an official 2 Years warranty. It covers all manufacturing defects and malfunctions that may occur during use. The warranty is valid at all authorized STP service centers and through AiO.lv

Can the product be returned after purchase?

Yes, you can return the product within 14 days of purchase if you bought it as a consumer (not a legal entity). Returns are possible without giving any reason — the main condition is that the product retains its original appearance and full set of accessories. We will make the process as simple and convenient as possible: just contact our customer support team, and we will help you arrange the return.

Where should I contact for warranty service?

For warranty-related questions you can contact the AiO.lv (SIA VSPRO) customer support team. We will assist with consultation, warranty claim processing, and coordination with certified service centers.

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