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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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

Product ID: 57355323

Details

Brand
STP
Item form
Liquid
Item volume
400
Material Type Free
Alcohol Free
Material feature
Unscented
Scent
Citrus

⛽5-in-1 fuel system cleaner

💧boosts fuel economy & MPG

⚙️restores engine power & response

110.23 DT

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Description

⛽ Power up your drive, save fuel, and protect your engine like a pro!

TRUSTED UK QUALITY - Proudly made in the UK with a citrus scent and alcohol-free, allergen-free formula.
EFFORTLESS MAINTENANCE - One 400ml bottle per tank—simple, quick, and compatible with most petrol cars.
ENGINE LONGEVITY SHIELD - STP Wearguard reduces friction and protects vital engine components for long-term health.
FUEL EFFICIENCY BOOSTER - Advanced cleaning tech optimizes combustion, stretching every drop of petrol further.
PEAK PERFORMANCE REVIVAL - Concentrated formula clears injectors & valves for smooth acceleration and zero hesitation.

STP Ultra 5-in-1 Petrol System Cleaner is a concentrated UK-made fuel additive that cleans injectors, intake valves, and the entire fuel system. It restores engine power, improves throttle response, enhances fuel economy, and protects engine components with Wearguard technology. Easy to use and suitable for most petrol cars, it’s the ultimate preventative maintenance solution for millennial professionals who demand peak performance and efficiency.

Specifications

ASIN	B00NC1GZ7G
Allergen Information	Allergen-Free
Best Sellers Rank	209 in Automotive ( See Top 100 in Automotive ) 11 in Fuel Systems
Brand Name	STP
Contains Liquid Contents?	Yes
Country of Origin	United Kingdom
Customer Reviews	4.6 4.6 out of 5 stars (2,117)
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
Manufacturer	STP
Material Features	Unscented
Material Type Free	Alcohol Free
Model Number	GST76400EN
Number of Items	1
Part Number	GST76400EN
Scent	Citrus
Size	400 ml (Pack of 1)
Special Features	Concentrated
Special Ingredients	acids
Specific Uses For Product	Engine
Surface Recommendation	Metal
Unit Count	400.0 millilitre

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110.23 DT

Duties & taxes included

In stock

Sold byAmazon TunisiaDelivered 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 Tunisia.

Secure transaction

Trustpilot

TrustScore 4.5 | 7,300+ reviews

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