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Shop Local. Support Independent. 9 products available
Motor Oil Additives

Shop 9 motor oil additives at National Hardware Group — from trusted brands like Bar'S Leaks, Hot Shot'S Secret, Howes and more. Every item is an authorized, warranty-backed purchase, with prices starting around $7.59. Ships nationwide, free over $75 on most items, or find it at your local store.

Trusted brands only Ships nationwide Pro accounts welcome Support your local hardware store
9 products
Howes Diesel Fuel Treatment 64 oz
6 per case

Howes

Howes Diesel Fuel Treatment 64 oz

MPN: 103060

$137.94
Save 15% at $75+ Case of 6
Hot Shot's Secret Stiction Eliminator Engine Oil Treatment/Stabilizer 16 fl. oz.
USA

Hot Shot'S Secret

Hot Shot's Secret Stiction Eliminator Engine Oil Treatment/Stabilizer 16 fl. oz.

MPN: HSS16Z

$19.99
Hot Shot's Secret FR3 Friction Reducer Oil Additive 16 fl. oz.
USA

Hot Shot'S Secret

Hot Shot's Secret FR3 Friction Reducer Oil Additive 16 fl. oz.

MPN: HSSFR316Z

$19.99
Motor Medic Motor Flush 32 oz
USA

Motor Medic

Motor Medic Motor Flush 32 oz

MPN: MF3

$7.59
Lucas Oil Products Heavy Duty Oil Stabilizer Oil Stabilizer 32 oz
USA

Lucas Oil Products

Lucas Oil Products Heavy Duty Oil Stabilizer Oil Stabilizer 32 oz

MPN: 10001

$15.99
Slick 50 Engine Treatment 15 oz
USA

Slick 50

Slick 50 Engine Treatment 15 oz

MPN: 750001

$19.99
Sea Foam Gasoline/2 and 4 Cycle Engine Motor Treatment 16 oz
USA

Sea Foam

Sea Foam Gasoline/2 and 4 Cycle Engine Motor Treatment 16 oz

MPN: SF16

$12.99
Sea Foam Diesel/Gasoline Fuel Treatment 20 oz
USA

Sea Foam

Sea Foam Diesel/Gasoline Fuel Treatment 20 oz

MPN: ST20

$12.99
STP Oil Treatment 15.73 oz
USA

Stp

STP Oil Treatment 15.73 oz

MPN: U66079

$8.99
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The stores we send you to are local and independently run — often for generations, the kind of place where someone behind the counter knows the regulars. We don't own them. We just think they deserve the foot traffic. They can put most of what we sell on their next truck. Ask there before you check out here.

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About our directory. National Hardware Group is an independent retailer and directory. The local stores we list and link to are separately owned and operated — we have no ownership stake in any of them, and most pay us nothing to be included. That includes plenty of stores flying a familiar banner that people don't realize are locally owned and run, not operated by a corporation. Store owners can choose to upgrade their listing for an enhanced presence or pickup features, but the base directory is free, and inclusion is never a paid endorsement.

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