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Product reference: ADDSTP16
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This STP Oil Treatment for Diesel engines is an exclusive formula that fortifies motor oil with an extra measure of additives to protect against engine wear, reduce oil consumption and prevents piston deposits in the ring zone.

Providing increased levels of viscosity improver plus anti-wear and anti-friction agents, it has been specially designed, following extensive research and testing, to be used specifically for all diesel engines. Fortified with dispersant, it is ‘shear’ stable to help counteract diesel fuel dilution.


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About Deevys

Established in 1935 by Clement Joseph Deevy (C.J. Deevy) and succeeded by Alan Deevy. Developed into Motor accessories in 1964 then also Marine chandlery in 1996. Mark & Colm Deevy have been running the business since the mid 1990's expanding and developing the business. Our key focuses have been consumer satisfaction and expert advice.

Contact Us

+353 51 874477
Deevys Motor & Marine Accessories
Parnell Street

Opening Hours:
Monday – Friday | 8am – 6pm
Saturdays | 8:30am - 5:30pm
Sundays | 1pm - 4pm