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.

Techron High Mileage Fuel System Cleaner 12 Oz Pack 1

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Description

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

FUEL ECONOMY MAXIMIZER - Keep your engine running lean and efficient, saving you money at every fill-up.
CORROSION DEFENSE SHIELD - Advanced inhibitors safeguard both ferrous and non-ferrous fuel system metals from aging damage.
ETHANOL BLEND COMPATIBLE - Seamlessly protects engines running on E10, E85, and other ethanol blends without compromise.
POWER BOOST FOR HIGH MILEAGE - Revive your engine’s lost vigor by eliminating stubborn gum and varnish deposits.
TRUSTED BY THE ROAD WARRIORS - Recommended for vehicles over 75,000 miles to maintain peak performance mile after mile.

Chevron Techron High Mileage Fuel System Cleaner is a 12 oz treatment designed for gasoline-powered vehicles with over 75,000 miles. It cleans fuel injectors, removes deposits, protects against corrosion in metal components, and is compatible with ethanol blends. Ideal for cars, light trucks, and SUVs, it helps restore engine power, improve fuel economy, and maintain long-term engine health.

Specifications

ASIN	B086FJV5J8
Best Sellers Rank	#534 in Automotive ( See Top 100 in Automotive ) #4 in Fuel System Cleaners
Brand	Chevron
Customer Reviews	4.7 4.7 out of 5 stars (1,996)
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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