---
product_id: 55103063
title: "GST60300EN12 Oil Treatment for Petrol Engines 300 ml"
brand: "stp"
price: "€ 30.06"
currency: EUR
in_stock: true
reviews_count: 13
category: "Stp"
url: https://www.desertcart.hr/products/55103063-gst60300en12-oil-treatment-for-petrol-engines-300-ml
store_origin: HR
region: Croatia
---

# extends oil life & viscosity boosts anti-wear & anti-friction 300ml universal fit GST60300EN12 Oil Treatment for Petrol Engines 300 ml

**Brand:** stp
**Price:** € 30.06
**Availability:** ✅ In Stock

## Summary

> ⚙️ Keep your engine young, even if it’s not! Stay ahead with STP Oil Treatment.

## Quick Answers

- **What is this?** GST60300EN12 Oil Treatment for Petrol Engines 300 ml by stp
- **How much does it cost?** € 30.06 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/55103063-gst60300en12-oil-treatment-for-petrol-engines-300-ml)

## Best For

- stp enthusiasts

## Why This Product

- Trusted stp brand quality
- Free international shipping included
- Worldwide delivery with tracking
- 15-day hassle-free returns

## Key Features

- • **Heat-Resistant Formula:** Protects engine components against high temperatures and oxidation.
- • **Easy Post-Service Boost:** Add after every oil change to keep your engine running smoother, longer.
- • **Engine Armor in a Bottle:** Fortifies motor oil with advanced additives for superior protection.
- • **Perfect for Classic Engines:** Ideal for older petrol engines needing extra lubrication and care.
- • **Viscosity Boost for Longevity:** Enhances oil thickness to maintain pressure and reduce wear over time.

## Overview

STP GST60300EN12 Oil Treatment is a 300ml mineral oil-based additive designed for petrol engines. It enhances motor oil with viscosity improvers and anti-wear, anti-friction, and anti-oxidation agents, extending oil life and protecting engine parts, especially in older vehicles. Compatible universally with petrol cars, it helps maintain optimal oil pressure and engine performance between oil changes.

## Description

STP Oil Treatment for Petrol Engines fortifies motor oil with an extra measure of additives, providing increased levels of viscosity improver plus anti-wear, anti-friction and anti-oxidation agents. STP Oil Treatment for Petrol Engines, a mineral oil based additive, provides extra protection against engine heat and allows oil to maintain key lubricating properties for longer to keep the engine going strong until the next oil change.

Review: Perfect for older simpler engines - I use this in a Ford Capri 2.0 to add a bit of extra zddp to the oil to protect the camshaft. Plus the engine has done 100k miles, so the extra viscosity keeps the oil pressure healthy. It may just be my imagination, but I'm sure the car runs quieter and cooler with this in. I add it to the 10w/40 semi-synthetic oil Ford originally recommended for Pinto engines, and it seems to alter the viscosity to approximately that of a 15w/50 or 20w/50, judging by the oil pressure gauge (and how it flows when I drain it). All in all brilliant for a classic engine, but probably not a good idea to put it in a post-millennial vehicle.
Review: STP GST60300EN12 Oil treatment for petrol engines (300ml) - As servicing mileage is increasing anywhere between 10,000m ~ 20,000m to support your synthetic or mineral oil--I would recommend using STP after every service to improve it's viscosity !! The best way of using it is to boil a saucepan open the STP bottle & let it simmer for about 10 minutes so that the STP is liquid & easier to pour into the engine without wasting any STP is also excellent for older engines where parts are beginning to wear & need better lubrication particularly valve guides & big-end assembly

## Features

- car parts

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B0057VT5LC |
| Automotive Fit Type | Universal Fit |
| Best Sellers Rank | 13,945 in Automotive ( See Top 100 in Automotive ) 35 in Vehicle Oil Additives |
| Brand | STP |
| Brand Name | STP |
| Compatible with Vehicle Type | Car |
| Container Type | Bottle |
| Customer Reviews | 4.6 out of 5 stars 141 Reviews |
| Global Trade Identification Number | 05018704350111 |
| Item Type Name | 33183 |
| Item Weight | 0.53 Pounds |
| Liquid Volume | 300 Millilitres |
| Liquid volume | 300 Millilitres |
| Manufacturer | Armor All |
| Manufacturer Part Number | GST60300EN12 |
| Model Number | GST60300EN12 |
| Package information | Bottle |
| Size | 300ml |
| Unit Count | 300.0 millilitre |
| Vehicle service type | Car |

## Product Details

- **Automotive Fit Type:** Universal Fit
- **Brand:** STP
- **Liquid volume:** 300 Millilitres
- **Package information:** Bottle
- **Vehicle service type:** Car

## Images

![GST60300EN12 Oil Treatment for Petrol Engines 300 ml - Image 1](https://m.media-amazon.com/images/I/61kWxccEiFL.jpg)
![GST60300EN12 Oil Treatment for Petrol Engines 300 ml - Image 2](https://m.media-amazon.com/images/I/71HBMk8n7bL.jpg)

## Questions & Answers

**Q: Can i use this in my motorbike that has a wet clutch ?**
A: hi this product thickens engine oil would say it would be too thick to use in a wet clutch I use it in an old car with a worn engine think that is what it does best

**Q: Is good for a6 2009 tdi 2.0l ? Automatic?**
A: I have a 2010 VW 2.00 litre auto and works fine on mine.

**Q: When using this product. Do you need to pour the entire bottle to the engine or half etc?**
A: Hello, First of all run a hot bowl of water and stick the bottle in and leave it for 10 minutes,reason for this its as like a set honey. In answer to your question you use the whole bottle at once preferably in a warmed up engine. Simply poor in where you top up oil and start the engine to allow it to idle for around 5 minutes this will allow it to mix with your oil properly whilst the engine is under minimal load.  It's a great product , hope this helps

**Q: Can I use this on a Diesel engine with a dpf**
A: Yes you can - Has no direct influence on DPF performance. Need a fuel additive for that.

## Customer Reviews

### ⭐⭐⭐⭐⭐ Perfect for older simpler engines
*by H***? on 15 October 2017*

I use this in a Ford Capri 2.0 to add a bit of extra zddp to the oil to protect the camshaft. Plus the engine has done 100k miles, so the extra viscosity keeps the oil pressure healthy. It may just be my imagination, but I'm sure the car runs quieter and cooler with this in. I add it to the 10w/40 semi-synthetic oil Ford originally recommended for Pinto engines, and it seems to alter the viscosity to approximately that of a 15w/50 or 20w/50, judging by the oil pressure gauge (and how it flows when I drain it). All in all brilliant for a classic engine, but probably not a good idea to put it in a post-millennial vehicle.

### ⭐⭐⭐⭐⭐ STP GST60300EN12 Oil treatment for petrol engines (300ml)
*by G***8 on 6 November 2021*

As servicing mileage is increasing anywhere between 10,000m ~ 20,000m to support your synthetic or mineral oil--I would recommend using STP after every service to improve it's viscosity !! The best way of using it is to boil a saucepan open the STP bottle & let it simmer for about 10 minutes so that the STP is liquid & easier to pour into the engine without wasting any STP is also excellent for older engines where parts are beginning to wear & need better lubrication particularly valve guides & big-end assembly

### ⭐⭐⭐⭐ A good product
*by A***R on 8 March 2025*

Rather smaller than what I expected

## Frequently Bought Together

- STP GST60300EN12 Oil Treatment for Petrol Engines 300 ml
- STP Ultra 5 in 1 Petrol System Cleaner 400ml, Restores Power and Protects your Engine, Enhances Fuel Economy, Mechanical Car Cleaning Products, Concentrated Cleaning Formula, Made in the UK

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*Product available on Desertcart Croatia*
*Store origin: HR*
*Last updated: 2026-07-24*