---
product_id: 16442409
title: "GTX MAGNATEC 5W-30 Full Synthetic Motor Oil, 5 Quart"
brand: "castrol"
price: "¥29828"
currency: JPY
in_stock: true
reviews_count: 10
category: "Castrol"
url: https://www.desertcart.jp/products/16442409-gtx-magnatec-5w-30-full-synthetic-motor-oil-5-quart
store_origin: JP
region: Japan
---

# Instant protection from startup 4X smoother engine wear protection Full synthetic 5W-30 viscosity GTX MAGNATEC 5W-30 Full Synthetic Motor Oil, 5 Quart

**Brand:** castrol
**Price:** ¥29828
**Availability:** ✅ In Stock

## Summary

> 🛡️ Protect your engine like a pro—because every start counts!

## Quick Answers

- **What is this?** GTX MAGNATEC 5W-30 Full Synthetic Motor Oil, 5 Quart by castrol
- **How much does it cost?** ¥29828 with free shipping
- **Is it available?** Yes, in stock and ready to ship
- **Where can I buy it?** [www.desertcart.jp](https://www.desertcart.jp/products/16442409-gtx-magnatec-5w-30-full-synthetic-motor-oil-5-quart)

## Best For

- castrol enthusiasts

## Why This Product

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

## Key Features

- • **Save More, Stress Less:** Extended oil life means fewer changes and more savings without compromising protection.
- • **Start Smart, Drive Confident:** Instant protection from the moment you turn the key—because 75% of wear happens in the first 20 minutes.
- • **Engine Wear? Not on Our Watch!:** Unique intelligent molecules cling to critical parts, reducing wear by 4X during warm-up.
- • **Trusted by High-Mileage Drivers:** Proven to keep engines quiet and smooth even past 200,000 miles—your engine’s new best friend.
- • **Synthetic Strength for Every Mile:** Premium full synthetic 5W-30 oil engineered for superior performance and longevity.

## Overview

Castrol GTX MAGNATEC 5W-30 Full Synthetic Motor Oil features intelligent molecules that cling to engine parts, providing up to 4X smoother wear protection during critical warm-up periods. Designed for universal fit and high mileage, this 5-quart jug delivers instant, lasting protection from startup, helping reduce engine wear and extend oil change intervals—all backed by a trusted brand with over 9,000 positive reviews.

## Description

ONLY Castrol GTX MAGNATEC IS UNIQUELY FORMULATED TO PROVIDE INSTANT PROTECTION FROM THE MOMENT YOU START. Did you know testing confirms that up to 75% of engine wear occurs during the first 20 minutes of warm up?When your engine stops, oil drains off critical engine parts, but the intelligent molecules in Castrol GTX MAGNATEC don’t – they form an extra layer of protection during warm up, when your engine needs it most, dramatically reducing engine wear and keeping critical parts up to 4X smoother.As tested in the industry Sequence IVA wear test.

Review: I've tried pretty much every oil.... - Oil today is a lot different than it used to be. It really doesn't matter what manufacturer you go with. After building engines and tearing them apart for years. From racing cars at the local drag strip and just fixing up every day drivers I've learned that all that matters is keeping your oil regularly changed and using the right weighted oil for your driving behavior. Oil does not cause problems in an engine... poor maintenance does. Going too long between oil changes, running your engine under strenuous loads the oil weight can't provide enough protection against (aka high performance engines), ignoring car maintenance like replacing engine seals when they go bad, changing bad lifters, oil pumps, etc. and driving a car with mechanical issues and then blaming it on your oil when things go wrong is mostly what I've seen people do in my car repair lifetime. Castrol,Valvoline,Mobile 1, Quaker State... whatever you choose just make sure you get what's right for your application and intended purpose and change it 3K miles or 3 months and your engine will be just fine. This particular Synthetic GTX is 5W-30 it has a very fluent viscosity and will lubricate your engines components just fine. Your motor does not care at all what brand of oil is in it just so long as that oil is able to go through all the the little cracks, holes, and crevices in your engine and lubricate the components that need to be lubricated. Just make sure you keep that oil fresh and change it out when it's time. Most people decide to start buying expensive oil when their engine is already acting funny hoping that will fix the mechanical problem they're really having and then picking on the oil when the problem still persists. You'll never in your life hear a mechanic diagnosing a certain brand of oil as the cause for mechanical engine failure... but you will hear them diagnose a lack of maintenance as the cause for it.
Review: excellent oil - First, those reviews showing the oil leaking in the shipping box from desertcart? they are not able to leak because the package I received had the 5qt jug in a sealed plastic bag! How can that leak? It can't.. Also, the date code on this jug was new oil, 120th day of 2020, so end of april beginning of may of production. Today it's august, so about 4months.. not bad. Now.. onto the oil. I've been using it in my civic (1996) for a couple years now. I've had the oil tested by blackstone and it's tested out to be awesome! No wearing, and I actually forgot to change my oil for about a year! I did not mean to do that, but had a personal issues take my concentration. But.. usually I only do 4-6 months intervals. so the testing after 1 year showed the same exact low wear that I have seen at the 6month mark! It does make the engine more quiet. I'd say about 10-15%! The fuel economy has increased in my engine or I should say it returned to what it should be. It does not burn off at all. this is excellent oil! Good job Castrol! And thanks to desertcart to have the lowest price around and delivered in 2 days! Thanks!

## Features

- ATTENTION: Castrol GTX Magnatec will be transitioning to a brand NEW Castrol product, GTX Full Synthetic, on January 1st 2022.
- Dramatically reduce engine wear
- Leave critical engine parts 4X smoother. As tested in the industry Sequence IVA wear test
- Superior wear protection on critical engine parts
- For best performance, follow the manufacturer's recommendations in your vehicle owner’s manual.

## Technical Specifications

| Specification | Value |
|---------------|-------|
| ASIN | B00TS9ZYWI |
| Automotive Fit Type | Universal Fit |
| Best Sellers Rank | #204,036 in Automotive ( See Top 100 in Automotive ) #968 in Motor Oils |
| Brand | Castrol |
| Brand Name | Castrol |
| Compatible with Vehicle Type | Car |
| Container Type | Jug |
| Customer Reviews | 4.8 out of 5 stars 9,182 Reviews |
| Global Trade Identification Number | 00079191230572 |
| Included Components | Motor Oil |
| Item Type Name | Motor Oil |
| Liquid Volume | 160 fluid ounces |
| Manufacturer | Castrol |
| Manufacturer Part Number | 03057C |
| Manufacturer Warranty Description | 12 Months |
| Model Number | 3057 |
| Package Information | Jug |
| SAE J300 Viscosity Grade | 5W-30 |
| Size | 5 Quart |
| UPC | 079191230572 |
| Unit Count | 160 Fluid Ounces |
| Vehicle Service Type | Car |
| Viscosity Level | Medium to High |

## Product Details

- **Brand:** Castrol
- **Liquid Volume:** 160 fluid ounces
- **Package Information:** Jug
- **SAE J300 Viscosity Grade:** 5W-30
- **Vehicle Service Type:** Car

## Images

![GTX MAGNATEC 5W-30 Full Synthetic Motor Oil, 5 Quart - Image 1](https://m.media-amazon.com/images/I/71Y0CAowaaL.jpg)

## Available Options

This product comes in different **Configuration, Size, Style** options.

## Customer Reviews

### ⭐⭐⭐⭐⭐ I've tried pretty much every oil....
*by M***R on November 20, 2021*

Oil today is a lot different than it used to be. It really doesn't matter what manufacturer you go with. After building engines and tearing them apart for years. From racing cars at the local drag strip and just fixing up every day drivers I've learned that all that matters is keeping your oil regularly changed and using the right weighted oil for your driving behavior. Oil does not cause problems in an engine... poor maintenance does. Going too long between oil changes, running your engine under strenuous loads the oil weight can't provide enough protection against (aka high performance engines), ignoring car maintenance like replacing engine seals when they go bad, changing bad lifters, oil pumps, etc. and driving a car with mechanical issues and then blaming it on your oil when things go wrong is mostly what I've seen people do in my car repair lifetime. Castrol,Valvoline,Mobile 1, Quaker State... whatever you choose just make sure you get what's right for your application and intended purpose and change it 3K miles or 3 months and your engine will be just fine. This particular Synthetic GTX is 5W-30 it has a very fluent viscosity and will lubricate your engines components just fine. Your motor does not care at all what brand of oil is in it just so long as that oil is able to go through all the the little cracks, holes, and crevices in your engine and lubricate the components that need to be lubricated. Just make sure you keep that oil fresh and change it out when it's time. Most people decide to start buying expensive oil when their engine is already acting funny hoping that will fix the mechanical problem they're really having and then picking on the oil when the problem still persists. You'll never in your life hear a mechanic diagnosing a certain brand of oil as the cause for mechanical engine failure... but you will hear them diagnose a lack of maintenance as the cause for it.

### ⭐⭐⭐⭐⭐ excellent oil
*by R***0 on August 26, 2020*

First, those reviews showing the oil leaking in the shipping box from amazon? they are not able to leak because the package I received had the 5qt jug in a sealed plastic bag! How can that leak? It can't.. Also, the date code on this jug was new oil, 120th day of 2020, so end of april beginning of may of production. Today it's august, so about 4months.. not bad. Now.. onto the oil. I've been using it in my civic (1996) for a couple years now. I've had the oil tested by blackstone and it's tested out to be awesome! No wearing, and I actually forgot to change my oil for about a year! I did not mean to do that, but had a personal issues take my concentration. But.. usually I only do 4-6 months intervals. so the testing after 1 year showed the same exact low wear that I have seen at the 6month mark! It does make the engine more quiet. I'd say about 10-15%! The fuel economy has increased in my engine or I should say it returned to what it should be. It does not burn off at all. this is excellent oil! Good job Castrol! And thanks to amazon to have the lowest price around and delivered in 2 days! Thanks!

### ⭐⭐⭐⭐⭐ Great oil for the price. Helps ALOT on cold starts
*by J***7 on July 6, 2018*

I am the type of guy who normally uses the top of the line oil like royal purple (40$-50$ for 5 Quarts). I recently started using this oil in my 04 Silverado with 210,000 miles. I've never had any engine issues whatsoever on my L59 5.3. I wanted to try this oil because first off, I was tired of spending well over $60 for 6 quarts of royal purple and a filter and I wanted to see if the "Magnatec" was just a gimmick or a thing these days (most products are with engine products). I have to say the oil definitely keeps the top end of the motor quiet with lifter noise on startup, especially in the winter which is what I wanted. Will continue to use this as the oil seems to hang around in the critical parts when the motor isn't running. With that being said, I have never had to tear down the motor and dont plan on it, so it is difficult to truly tell. Update as of 10/5/18: Getting ready to drain this out of my motor as it is time for an oil change. Dipstick and oil coloration still looks new even at 215,000 miles. This oil still helps on those cold starts where I used to get some lifter noise. Have not heard it since using this.

## Frequently Bought Together

- Castrol GTX MAGNATEC 5W-30 Full Synthetic Motor Oil, 5 Quart
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- FRAM Ultra Synthetic Automotive Replacement Oil Filter, Designed for Synthetic Oil Changes Lasting up to 20k Miles, XG7317 with SureGrip (Pack of 1)

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*Product available on Desertcart Japan*
*Store origin: JP*
*Last updated: 2026-10-15*