Can this be used on modern car engines. my mb vito 2015, diesel states no addeditive should be added to the fuel. some say it may damage the cat?

If your user manual or manufacturer literature states that no additives should be used, then I would follow that directive. However, it is something that you might want to check with the manufacturer. If you use fuel from a recognised oil company, like shell or BP etc. you don’t need to use this cleaner as the additives are already in your fuel. If you use supermarket fuel like Asda or Sainsburys, then you would want to use an additive, but like I said, check with your manufacturer first.

How does the MPG gains maintain for the full 4000 miles before the recommended time to add a new bottle to it?

I renew after approx. 3500 miles and am satisfied with the MPG since I have been using the product. An approx. gain of 3/4 MPG.

Is it safe for BMW x1 2016 diesel engine ?

Don’t see any reason why not, added to Mini Countryman Diesel engine, which is the same I believe

do i use this before or after filling in full tank?

I take it with me when I’m filling the tank so I can pour it in after the petrol

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STP Diesel Fuel Additive Treatment Bundle, Includes Diesel Injector Cleaner

Product ID: 564953065

Details

Brand
STP
Contains liquid contents
Yes
Item form
Other
Manufacturer
STP
Number of items
1
Package information
Gel

⛽600ml total fuel system cleaner volume

🌿Lowers emissions & fuel consumption

⚙️Dual-action injector & system cleaning

₨709

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Description

⚡ Unlock your diesel’s hidden power and efficiency — don’t let deposits hold you back!

ECO SMART ENGINE CARE - Reduces emissions and fuel use for a greener, wallet-friendly ride
QUICK EFFORTLESS MAINTENANCE - Just pour into a full tank and feel smoother acceleration within 80km
TRUSTED LEGACY PROVEN RESULTS - STP’s 60+ years of expertise delivering reliable engine rejuvenation
UNIVERSAL DIESEL COMPATIBILITY - Works seamlessly with DI, IDI, common rail engines & catalytic converters
TURBOCHARGE YOUR DIESEL PERFORMANCE - Dual formula bundle cleans injectors & entire fuel system for peak power

The STP Diesel Fuel Additive Treatment Bundle combines a 200ml Diesel Injector Cleaner and a 400ml Ultra 5-in-1 Diesel System Cleaner to effectively remove deposits, restore engine performance, reduce rough idling, and lower emissions. Suitable for all diesel engines including DI, IDI, and common rail, this easy-to-use treatment improves fuel efficiency and engine smoothness with just one application.

Specifications

ASIN	B0BWFG75G8
Best Sellers Rank	18 in Automotive ( See Top 100 in Automotive ) 1 in Fuel Systems
Brand Name	STP
Container Type	Gel
Contains Liquid Contents?	Yes
Customer Reviews	4.6 4.6 out of 5 stars (480)
Included Components	1 x STP 400ML Ultra Diesel, 1 x STP 200ML Diesel Injector Cleaner
Item Form	Other
Item Highlight	Includes Ultra 5-in-1 Diesel System Cleaner, Cleans Injectors and Restores Performance For A Smoother Engine, Made in the UK
Item Type Name	STP Diesel Kit
Manufacturer	STP
Model Number	SMVP-1-1EN
Number of Items	1
Part Number	E303916100
Recommended Uses For Product	diesel engine maintenance and cleaning
Size	600 ml (Pack of 1)
Unit Count	600.0 millilitre

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₨709

Duties & taxes included

In stock

Sold byAmazon SeychellesDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

Buyer Protection · Full refund if your order doesn't arrive as described.

Desertcart purchases this item on your behalf and handles shipping, customs, and support to Seychelles.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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The product exactly matches the description. Very satisfied with my purchase.

5 days ago

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