lawnmowers is this good to keep the system clean while using it and not just when storing it?

I've been using it in all the fuels for my mower, 2-stroke mixes, and my motorcycle and all three have been surprisingly clean, especially the two stroke motors.

Is this to be used prior to an oil change?

If it's like 500 miles before an oil change, that's OK. You can also use after an oil change, but TECHRON recommends NOT to use more than twice during a new oil change. I use during the last 500 miles (whole bottle) on near empty tank & run the car until the reserve light comes on. Been using this for at least 20 years. If the car runs rough, you can pour in a bottle twice, like every 2,500 miles, or repeat the process, whichever you want to do. For best results, try & do as much highway driving after pouring in & make sure to drive at least 5-10 miles to get it up in the lines & all before turning the engine off. Since you're going to be at the gas station & pouring in before refilling the tank, this is a good time. Good Luck!

What is the ratio of additive to fuel? Can it be used in nonethanol fuel?

1 oz per 10 gallons. It can be used in nonethanol fuel.

Can you reseal the 20 oz bottle and use the rest later?

You can't physically reseal the paper tab, but yes you can screw the cap back on & it will keep it sealed for later use. However, this will not guarantee the same 5 year shelf life.

Chevron Techron High Mileage Fuel System Cleaner 12 Oz Pack

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Description

⛽ Keep your high-mileage ride running like new—because every mile counts!

HIGH MILEAGE HERO - Specifically formulated for vehicles over 75,000 miles to maintain peak engine health and longevity.
ENGINE POWER REBOOT - Eradicates gum & varnish buildup to restore lost horsepower and smooth acceleration.
FUEL EFFICIENCY BOOSTER - Optimizes fuel economy by keeping injectors and fuel lines impeccably clean.
CORROSION DEFENSE SHIELD - Advanced inhibitors protect iron, steel, copper, and silver components from aging corrosion.
ETHANOL BLEND COMPATIBLE - Safe and effective with all ethanol fuel blends (E10, E85), including hybrids—no catalytic converter harm.

Chevron Techron High Mileage Fuel System Cleaner is a premium 12 oz formula designed to clean and protect fuel systems in vehicles with over 75,000 miles. It removes deposits that degrade engine performance, improves fuel economy, and prevents corrosion across multiple metal types. Compatible with all gasoline-ethanol blends and safe for catalytic converters, it’s the go-to maintenance essential for modern and classic cars, light trucks, and SUVs.

Specifications

ASIN	B086FFK5H3
Best Sellers Rank	#23,013 in Automotive ( See Top 100 in Automotive ) #49 in Automotive Fuel System Cleaners
Brand	Chevron
Customer Reviews	4.7 4.7 out of 5 stars (1,743)
Date First Available	13 August 2020
Item Weight	2.38 Kilograms
Item model number	266711163-6PK
Manufacturer	Chevron
Manufacturer Part Number	266711163-6PK
Model	Techron High Mileage Fuel System Cleaner
Product Dimensions	8.02 x 6.77 x 22.6 cm; 2.38 kg

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