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 engine young, your wallet happy, and never miss a mile!

HIGH MILEAGE HERO - Specifically engineered for vehicles over 75,000 miles to combat age-related carbon buildup and wear.
ENGINE POWER REVIVAL - Eradicates gum & varnish buildup to restore lost horsepower and smooth acceleration.
FUEL EFFICIENCY BOOSTER - Optimizes fuel combustion, helping you save at the pump with every 21-gallon treatment.
CORROSION DEFENSE SHIELD - Advanced inhibitors protect iron, steel, copper, and silver components from damaging corrosion.
ETHANOL BLEND COMPATIBLE - Safe and effective with all ethanol fuel blends (E10, E85), including gasoline hybrids.

Chevron Techron High Mileage Fuel System Cleaner is a premium 12 oz treatment designed for vehicles with over 75,000 miles. It cleans fuel injectors, removes deposits, and protects against corrosion across multiple metal types, enhancing engine power and fuel economy. Compatible with all gasoline and ethanol blends, it treats up to 21 gallons per bottle and is safe for modern and classic engines alike.

Specifications

ASIN	B086FJV5J8
Best Sellers Rank	#902 in Automotive ( See Top 100 in Automotive ) #8 in Fuel System Cleaners
Brand	Chevron
Customer Reviews	4.7 4.7 out of 5 stars (1,893)
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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