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

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 concentrated fuel system cleaner

💧400ml easy-dose bottle for full tank treatment

⚙️restores engine power & throttle response

R692

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Sold byAmazon South AfricaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

⚡ Unlock your engine’s hidden potential with every fill-up!

FUEL ECONOMY BOOSTER - Advanced cleaning tech optimizes combustion, helping you squeeze more miles per gallon.
EFFORTLESS MAINTENANCE - One 400ml bottle per tank—simple, quick, and ideal for regular preventative care.
ENGINE LONGEVITY GUARD - STP Wearguard reduces friction and conditions fuel system components for long-term protection.
UK MADE QUALITY ASSURANCE - Trusted British engineering delivering reliable, concentrated cleaning power.
PEAK ENGINE PERFORMANCE RESTORED - Powerful formula removes carbon deposits and fuel build-up for smoother acceleration and idle.

STP Ultra 5 in 1 Petrol System Cleaner is a concentrated 400ml fuel additive designed to clean injectors, intake valves, and the entire petrol system. It restores engine power, improves throttle response, enhances fuel economy, and protects engine components with advanced Wearguard technology. Easy to use and made in the UK, it’s the perfect preventative maintenance solution for professional drivers seeking peak performance and efficiency.

Specifications

ASIN	B00NC1GZ7G
Allergen Information	Allergen-Free
Best Sellers Rank	68 in Automotive ( See Top 100 in Automotive ) 3 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 (2,145)
Global Trade Identification Number	05020144800125
Included Components	STP Ultra 5-in-1 Petrol System Cleaner 400ml
Item Form	Liquid
Item Highlight	Restores Power and Protects your Engine, Mechanical Car Cleaning Products, Concentrated Cleaning Formula, Made in the UK
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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R692

Duties & taxes included

In stock

Sold byAmazon South AfricaDelivered 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 South Africa.

Secure transaction

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TrustScore 4.5 | 7,300+ reviews

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