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30% Off Online Orders of Select Parts and Accessories. Enter Promo Code PEP30 in Cart

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30% Off Online Orders of Select Parts and Accessories
Receive 30% Off Your Online Purchase. Use promotional code PEP30 at checkout to receive discount. Not valid in combination with any other discounts or promotions. Not valid on gift cards, special orders, installed merchandise, commercial or fleet purchases. Excludes the following categories: Tires, Wheels, Batteries, Powerstop Brake Kits, Oil, Antifreeze, Refrigerant, Truck Boxes, Vent Visors, Bug Shields and BRANDS: Razor, Traxxas, Superchips, Hypertech, Edge, Bully Dog, Diablo, Edelbrock, Holley, NOS, Proform, Specialty Auto, Thule, Autometer, Accel, K&N, Kenwood, Pioneer, Sony, JVC, MSD and BBK Performance. Valid online until 2:59 am EST on 10/27/16. Online orders scheduled for in-store pick up must be completed by closing on 10/26/16 for discount to apply.

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  • Part #: 65148 |
  • SKU: 118536

Available today

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    • Oil additive helps protect against engine wear
    • Motor oil additive helps reduce oil consumption
PayPal available for online purchases. Major credit cards accepted online and in store. Pay online, in-store or take advantage of our Pep Boys credit card. Learn more and see additional details in cart.

STP Oil Additive

This high-viscosity formula is specially formulated to help fight metal-to-metal friction by providing a thicker cushion between moving engine parts
  • Oil additive helps protect against engine wear
  • Motor oil additive helps reduce oil consumption
  • Oil treatment helps protect engine parts


Rated 4.8 out of 5 by 10 reviewers.
Rated 5 out of 5 by stp oil additive It works great, I use it twice a year. October 21, 2016
Rated 5 out of 5 by Works great Been using this product since my car went over 100,000 miles. It's now over 200,000 I just add it midway before my next oil change. October 9, 2016
Rated 5 out of 5 by Work grate My old 1985 Dodge has almost 150000 miles on it It use to burn 1Qt of oil every 1000 miles witch seem to be the norm for them 318 ci as i had a few .Then i started to see a lil blue smoke at lights. I new it was ether valve seals or the ring's so being i was really hoping to get another 50000 out of it before rebuild.I wasn't happy.Then i saw the STP Thor t i will give it a try.Not only did the blue smoke stop but when i chk the oil at the next 1000 mile mark it did not burn any.I still don't believe it so next 1000 mile mark we will see .I do hear a Lil lifter noise in the morning for a very short time sometimes . September 13, 2016
Rated 5 out of 5 by Alternate use. Used as an additive for worn out knee action shocks. August 30, 2016
Rated 4 out of 5 by Thick!!! It's pretty good for what you need August 8, 2016
Rated 5 out of 5 by Love this stuff Great! October 27, 2015
Rated 4 out of 5 by Good product. STP contains extra zink needed for high performance equipment. August 11, 2015
Rated 5 out of 5 by Oil Change parts Wonderful ... I got Valvoline oil for the car and a new filter PLUS STP oil additive all for $27. That will keep my 99 Camry running smooth for 4,000 miles. January 3, 2015
  • 2016-10-23 T08:12:43.818-05:00
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