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.Duty & taxes paid at delivery

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AR$52559

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Sold byAmazon ArgentinaDelivered byDesertcartCustomer service byDesertcartReturns14 days · 30 with PRO

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Description

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

TRUSTED BY THE PROS - Chevron’s top-rated formula, perfect for vehicles over 75,000 miles, keeps your engine humming smoothly.
FUEL ECONOMY MAXIMIZER - Keep your rides efficient and save more at the pump with cleaner fuel systems.
UNIVERSAL COMPATIBILITY - Works seamlessly with all gasoline and ethanol blends, including hybrids.
CORROSION DEFENSE SHIELD - Advanced inhibitors guard metal parts from rust and corrosion, extending engine life.
POWER BOOST FOR HIGH MILEAGE - Revive your engine’s lost vigor by eliminating gum and varnish buildup.

Chevron Techron High Mileage Fuel System Cleaner is a 12 oz treatment designed for vehicles with over 75,000 miles. It cleans fuel system deposits, restores engine power, maximizes fuel efficiency, and protects metal components from corrosion. Compatible with all gasoline and ethanol blends, it treats up to 21 gallons of fuel and is safe for catalytic converters and oxygen sensors.

Specifications

ASIN	B086FJV5J8
Best Sellers Rank	#613 in Automotive ( See Top 100 in Automotive ) #3 in Fuel System Cleaners
Brand	Chevron
Customer Reviews	4.7 4.7 out of 5 stars (1,955)
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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