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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Fully operational. Shipping worldwide, on schedule.Customs & duties included in the price

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Description

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

ETHANOL BLEND COMPATIBLE - Safe and effective with all ethanol blends (E10, E85), including hybrids—no catalytic converter worries.
SHIELD AGAINST CORROSION - Advanced inhibitors protect iron, steel, copper & silver components from damaging corrosion.
DRIVE LONGER SPEND SMARTER - One 12oz bottle treats up to 21 gallons, optimizing fuel efficiency for every mile.
REVIVE YOUR ENGINES MOJO - Eliminates gum, varnish & deposits to restore lost power and smooth performance.
TAILORED FOR HIGH MILEAGE HEROES - Specifically formulated for vehicles over 75,000 miles to combat age-related fuel system wear.

Chevron Techron High Mileage Fuel System Cleaner is a 12oz premium additive designed to clean and protect fuel systems in vehicles with over 75,000 miles. It removes deposits that reduce engine power and fuel economy, protects against corrosion on multiple metal types, and is compatible with all gasoline-ethanol blends. Ideal for modern and classic cars, light trucks, and SUVs, it treats up to 21 gallons of fuel and supports long-term engine health without harming catalytic converters or oxygen sensors.

Specifications

ASIN	B086FJV5J8
Best Sellers Rank	#533 in Automotive ( See Top 100 in Automotive ) #5 in Fuel System Cleaners
Brand	Chevron
Customer Reviews	4.7 4.7 out of 5 stars (1,979)
Date First Available	March 26, 2020
Item Weight	12 ounces
Item model number	266711163
Manufacturer	Chevron
Manufacturer Part Number	266711163
Model	Techron High Mileage Fuel System Cleaner
Product Dimensions	3.16 x 2.66 x 8.9 inches

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