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 your ride unstoppable!

TRUSTED BY MILLIONS - Chevron’s top-rated formula with 4.7 stars and nearly 2,000 reviews—join the savvy drivers who never settle.
CORROSION DEFENSE SHIELD - Guard vital metal components against rust and corrosion for lasting durability.
ETHANOL BLEND COMPATIBLE - Seamlessly works with all ethanol fuel blends, including E10 and E85.
FUEL EFFICIENCY MAXIMIZER - Slash fuel waste by keeping your system deposit-free and running lean.
POWER BOOST FOR HIGH MILEAGE - Revive your engine’s lost vigor and smoothness with every tank.

Chevron Techron High Mileage Fuel System Cleaner is a premium 12 oz treatment designed for vehicles with over 75,000 miles. It effectively removes gum, varnish, and carbon deposits to restore engine power and improve fuel economy. Featuring advanced corrosion inhibitors, it protects both ferrous and non-ferrous fuel system components. Compatible with all gasoline and ethanol blends, this cleaner is trusted by millions to maintain peak engine performance and longevity.

Specifications

ASIN	B086FJV5J8
Best Sellers Rank	#777 in Automotive ( See Top 100 in Automotive ) #6 in Fuel System Cleaners
Brand	Chevron
Customer Reviews	4.7 4.7 out of 5 stars (1,899)
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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