I have a small 14 L motorcycle tank. How much of this 400 ml bottle should I put in?

Half should be sufficient for that tank.it wont hurt just increases strength of you use more.

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.

I bought a set with diesel treatment. can i use them both at the same time?

I would use one at a time just follow the instructions.

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.

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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

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

Product ID: 57355323

Details

Brand
STP
Item form
Liquid
Item volume
400
Item weight
400 Grams
Number of items
1
Scent
Citrus

⛽5-in-1 fuel system cleaning

💧concentrated 400ml formula

⚙️restores engine power & response

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€ 23.78

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Description

⛽ Clean fuel, smooth ride, smarter drive.

DRIVE WITH CONFIDENCE - Removes carbon build-up to eliminate hesitation, rough idling & boost throttle response.
EFFORTLESS MAINTENANCE - One 400ml bottle per tank—simple, quick, and perfect for regular preventative care.
ENGINE LONGEVITY GUARD - STP Wearguard tech reduces friction and protects vital engine components over time.
FUEL ECONOMY OPTIMIZER - Enhances combustion for noticeable MPG improvements and smoother daily drives.
PEAK PERFORMANCE UNLEASHED - Advanced 5-in-1 formula cleans injectors, valves & fuel system for max engine efficiency.

STP Ultra 5-in-1 Petrol System Cleaner is a UK-made, concentrated 400ml fuel additive designed to clean your entire petrol system—injectors, intake valves, and fuel lines—restoring engine power, improving throttle response, and boosting fuel economy. Its advanced formula reduces carbon deposits and friction, protecting engine components and ensuring long-term performance. Easy to use with one bottle per tank, it’s the smart choice for proactive engine maintenance trusted by professionals and enthusiasts alike.

Specifications

ASIN	B00NC1GZ7G
Best Sellers Rank	121 in Automotive ( See Top 100 in Automotive ) 3 in Fuel Systems
Brand	STP
Brand Name	STP
Contains Liquid Contents?	Yes
Country of Origin	United Kingdom
Customer Reviews	4.6 out of 5 stars 2,071 Reviews
Global Trade Identification Number	05020144800125
Included Components	STP Ultra 5-in-1 Petrol System Cleaner 400ml
Item Form	Liquid
Item Type Name	STP Ultra 5-in-1 Petrol System Cleaner 400ml
Item Volume	400 Millilitres
Item Weight	400 Grams
Item form	Liquid
Item volume	400 Millilitres
Manufacturer	STP
Model Number	GST76400EN
Number of Items	1
Part Number	GST76400EN
Scent	Citrus
Size	400 ml (Pack of 1)
Special Features	Concentrated
Specific Uses For Product	Engine
Specific uses for product	Engine
Surface Recommendation	Metal
Unit Count	400.0 millilitre
Unit count	400.0 millilitre

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€ 23.78

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In stock

Sold byAmazon AustriaDelivered 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 Austria.

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