Big Indy 500 advertiser (3 letters)

{ Answer }

STP

{ Related Clues }

500 initials
500 letters
500 letters?
Engine additive
Fuel additive
Gasoline additive
Indy initials
Indy letters
Nascar sponsor
P.O. item
"The Racer's Edge"
"The racer's edge"
The Racer's Edge
Speedway letters
Sponsor at Indy
1999 Clorox acquisition
60's-70's hallucinogen
Auto additive brand
Big race sponsor
Brand at a gas station
Brand of octane booster
Car care product
Engine additive: Abbr.
Engine additive letters
Engine-cleaning brand
Fuel additive brand
Gas station product
Indy 500 advertiser
Indy 500 letters
Indy 500 logo
Indy racer sponsor
Longtime Nascar sponsor
Maker of fuel additives
Motor Up alternative
Popular fuel additive
Popular oil additive
Race car sponsor
Racecar fuel additive
"The Racer's Edge" sloganeer
Racing car product
___ 500, annual race in Ridgeway, Va.
Auto additive with a red oval logo
Longtime sponsor of racing's #43 car

{ Tags }

additive, advertiser, big, brand, car, edge, engine, fuel, gas, indy, initials, item, letters, nascar, product, race, racers, racing, sponsor, stp, 500

{ Notes }

The answer STP is seen frequently, appearing about once every 140 puzzles.

{ Definition }

STP as a noun:

1. (STP, s.t.p.) = standard temperature and pressure