Comma Diesel Magic 400ml



Fitted bundle deal

includes Accessories + Fitting

Item: 264671

Comma Diesel Magic 400ml


(Unit price: £16.23 per litre)

How can I get it?

FREE Click & Collect

  • Description
  • Reviews
  • Delivery Options
  • Help & Advice
  • Buying Options
  • Comma Diesel Magic

    The Comma Diesel Magic is a concentrated diesel additive, which rapidly removes harmful deposits, restoring lost power and acceleration. It also helps to increase fuel economy and improves cold start performance while reducing 'Diesel knock' noise. The Comma Diesel Magic contains a Cetane improver to boost performance.

    Comma Diesel Magic Extra Info

    • Concentrated diesel additive rapidly removes harmful deposits
    • Restores lost power and acceleration
    • Helps increase fuel economy
    • Improves cold start performance
    • Helps reduce 'Diesel knock' noise
    • Contains Cetane improver to boost performance
  • Comma Diesel Magic 400ml is rated 4.4 out of 5 by 20.
    Rated 5 out of 5 by from Wonderful Stuff!! I have a 15 YO BMW 320D. It was getting a bit sluggish up hills and accelerating. I picked this on a whim because it had no flashy advertising and was cheap! I put it in with a full tank. I did a 130 mile round trip to Ikea then back to my normal 10 mile per day commute. I noticed the improvement in acceleration after just over a 1/4 tank used!
    Date published: 2017-10-20
    Rated 5 out of 5 by from Works in 25 miles - British made Loads of choice in store - opted for this one as it treats 60ltrs not half a tank like some. British made and not expensive can't recommend this more.
    Date published: 2017-06-21
    Rated 5 out of 5 by from Works Well I have used this product before and I am very please with the results. Keeps the black clouds away from the emmissions.
    Date published: 2014-10-23
    Rated 3 out of 5 by from Will try again.. Bought this product to try and clean the fuel injectors on my Megane, I read other reviews to find the best method to use it all the reviews suggest to fill the tank half full and pour the entire bottle in it but It didn't work for me as my methane still had no power and puffing out white smoke.. I am going to give it another chance and buy it again and pour in with very little diesel in the car so it is diluted stronger! Will post results again. Stay classy
    Date published: 2014-10-01
    Rated 5 out of 5 by from Seriously good stuff Well worth the investment, I bought this because my van started to smoke quite badly, a bottle of Diesel magic straight in the tank sorted it out. Does what it says on the tin.
    Date published: 2013-10-18
    Rated 3 out of 5 by from Good Good to have it then any other product. Will consider buy again
    Date published: 2013-09-15
    Rated 5 out of 5 by from Good product I have used this for many years . I notice the difference after a few miles and an improvement of about 3 mpg at a 1000 miles a mouth this is money well spent
    Date published: 2013-08-10
    Rated 4 out of 5 by from Does the job! I have used this for some time now and it does seem to make a difference. If using for the first time in a car i mix with half a tank of fuel to give the system a good clean then as product directions after that.
    Date published: 2013-02-10
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    • clientName_halfords
  • UK Delivery

    £3.99 NEXT DAY Delivery available on orders under £40 placed by 8pm*

    Your delivery date will be communicated at checkout. Delivery times are Monday to Saturday.


    UK Delivery

    FREE Click & Collect - you can reserve an item online and pick it up from a store of your choice

    Simply enter your Postcode on the product page to check availability, and select Click & Collect at checkout. What's more, you pay for your items on collection. Click here to learn more.

    Items in stock - collect from 1 hour
    If your item is in stock at your chosen store, you can collect it from one hour after ordering online. We'll hold your item in-store for seven days.

    Items not in stock - collect next day*
    If your item isn't in stock, we can order it to your chosen store for collection.
    *If you place your order before 8pm you can collect it from 4pm the following day (except Sundays), and we'll hold your item in-store for seven days.

    Built Bikes
    Collection time will increase by 24 hours if you'd like us to build your bike for you.

    Please note that items sent directly from the supplier need to be ordered by 3pm for collection two days later. All delivery times will be shown during checkout.


  • You can buy this product from one of our carefully selected Approved Partners. The full list of options available are below. Simply add your chosen option to your basket and proceed to checkout when you're ready.

    You can purchase products supplied by Halfords and selected other suppliers on

    Checkout is always via and all payment will be taken via In checkout the products will be split into separate deliveries for each supplier.

    Showing 1 - X of our buying options
    Price Seller Info Purchase

Some of the parts we sell here at Halfords have been reconditioned. These will carry a Refundable Deposit or an extra surcharge amount. When you add one of these reconditioned items to your basket, we'll add this extra cost automatically.

Once you've sent us your old item we'll check it over, and then refund you the full surcharge as long as everything is ok.

Before you return your old unit please make sure it's in re-serviceable condition. So if you're returning caliper casings, you'll need to double check they aren't badly damaged or broken. If the part you've sent is found to be unserviceable, we reserve the right not to refund the surcharge.

Please note that if you're returning your old unit to our National Returns Centre then this will be at your own expense.

Comma Fuel & Oil Additives

Comma Diesel Magic 400ml

£6.49 The Comma Diesel Magic is a concentrated diesel additive, which rapidly removes harmful deposits.