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
Item weight
400 Grams
Number of items
1
Scent
Citrus

⚡Performance boost

⛽Fuel-saving tech

🛠️Advanced engine protection

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6151 kr

Duties & taxes included

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Sold byAmazon IcelandDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Unlock your engine’s hidden potential—drive smarter, not harder!

DEPOSIT DESTROYER - Cleans fuel injectors for smoother rides
CONCENTRATED POWER - One bottle treats a full tank—effortless maintenance
STP WEARGUARD TECHNOLOGY - Engineered to reduce friction and wear
FUEL EFFICIENCY MAXIMIZER - Cut costs and emissions with every tank
PEAK PERFORMANCE RESTORER - Brings back that new-car acceleration feel

STP Ultra 5-in-1 Petrol System Cleaner is a UK-made, concentrated liquid formula designed to clean and condition petrol engines. It reduces friction, removes deposits, and restores peak engine performance while improving fuel economy. Trusted by thousands with a 4.6-star rating, it’s an easy, cost-effective way to maintain your vehicle’s fuel system between services.

Specifications

ASIN	B00NC1GZ7G
Best Sellers Rank	154 in Automotive ( See Top 100 in Automotive ) 8 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 (2,033)
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
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
Surface Recommendation	Metal
Unit Count	400.0 millilitre

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