---
product_id: 55103063
title: "STP GST60300EN12 Oil Treatment for Petrol Engines 300 ml"
brand: "stp"
price: "$51"
currency: NZD
in_stock: true
reviews_count: 8
category: "Stp"
url: https://www.desertcart.nz/products/55103063-stp-gst60300en12-oil-treatment-for-petrol-engines-300-ml
store_origin: NZ
region: New Zealand
---

# extends oil life till next change boosts anti-wear & anti-friction 300ml precision dose STP GST60300EN12 Oil Treatment for Petrol Engines 300 ml

**Brand:** stp
**Price:** $51
**Availability:** ✅ In Stock

## Summary

> ⚙️ Keep your engine running cooler, quieter, and stronger — because classics deserve the best!

## Quick Answers

- **What is this?** STP GST60300EN12 Oil Treatment for Petrol Engines 300 ml by stp
- **How much does it cost?** $51 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.nz](https://www.desertcart.nz/products/55103063-stp-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

- • **Viscosity Mastery:** Enhances oil thickness to maintain optimal pressure and flow
- • **Heat Shield Technology:** Protects engine components from high-temperature wear and oxidation
- • **Service Interval Savior:** Use after every oil change to maximize oil performance and engine quietness
- • **Engine Armor in a Bottle:** Fortifies motor oil with advanced additives for superior protection
- • **Classic Car’s Best Friend:** Ideal for older petrol engines needing extra lubrication and longevity

## Overview

STP GST60300EN12 Oil Treatment is a 300ml mineral oil-based additive designed for petrol engines, enhancing motor oil with viscosity improvers and anti-wear, anti-friction, and anti-oxidation agents. Perfect for older or high-mileage engines, it extends oil life, improves lubrication, and protects critical engine parts under heat stress, ensuring smoother, quieter operation until the next oil change.

## 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 | 89,090 in Automotive ( See Top 100 in Automotive ) 120 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 138 Reviews |
| Global Trade Identification Number | 05018704350111 |
| Item Type Name | 33183 |
| Item Weight | 240 g |
| Liquid Volume | 300 Millilitres |
| Liquid volume | 300 Millilitres |
| Manufacturer | Armor All |
| Manufacturer Part Number | GST60300EN12 |
| Package information | Bottle |
| Unit Count | 300.0 millilitre(s) |
| Vehicle service type | Car |
| Viscosity | 5W-30 sae_grade |

## Product Details

- **Viscosity:** 5W-30 sae_grade
- **Brand:** STP
- **Liquid volume:** 300 Millilitres
- **Package information:** Bottle
- **Vehicle service type:** Car

## Images

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

### ⭐⭐⭐⭐⭐ Just the job!
*by G***Y on 26 January 2025*

Having bought my granddaughter a 10yo jalopy for her 18th birthday, I decided a tad of engine care wouldn't go amiss! I have used STP additives since I was a poor student myself (many moons ago) and have never regretted it. Prevention is always better than cure! This time the car seems to be happier and running smoothly. Let's hope it stays that way! Remember to closely follow the instructions on the container.

## 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 New Zealand*
*Store origin: NZ*
*Last updated: 2026-02-27*