Oil & Engine Additives

Most recent test Apr 2026

Older tests below are kept for reference. Products change; lead with the newest result.

Earlier tests

STA-BIL

Oct 2025 · 13 tested

After 5 Years, I Found The Only Fuel Stabilizer That Works!

Oil & Engine Additives

CERAKOTE

Sep 2025 · 10 tested

I've Never Seen A Plastic Car Trim Restorer This Good! Wow!

Oil & Engine Additives

Red Line Supercool

Mar 2025 · 10 tested

Do "Super Coolants" Lower Engine Temperature By 30 Degrees?

Oil & Engine Additives

Hot Shot’s Secret

Jan 2025 · 15 tested

Are Diesel Anti Gel Fuel Additives a Scam? Let's Settle This!

Oil & Engine Additives

AT-205

Feb 2023 · 14 tested

Do Stop Leak Products Work? Do They Damage Engine Seals? Will They Destroy an Engine? Let's Find Out

Oil & Engine Additives

CeraKote Ceramic Trim Coat

Sep 2020 · 9 tested

Best Plastic Car Trim Restorer? 303 Protect vs Mothers, Turtle Wax, Meguiars, CeraKote

Oil & Engine Additives

Hot Shot's

Nov 2019 · 6 tested

Which Diesel Anti-Gel Additive is Best? Power Service Diesel, Howes, Hot Shots, Stanadyne

Oil & Engine Additives

Dec 2018 · 2 tested

Is HEET better than Seafoam for Water in Fuel? Let's find out!

Oil & Engine Additives

Aug 2018 · 3 tested

Did the Seafoam fix last? Update on the Ford Ranger

Oil & Engine Additives

Jun 2018 · 3 tested

Did the "Engine Restore" Compression Improvement Last? One year later (Episode 2)

Oil & Engine Additives

Seafoam Deep Creep

Jun 2018 · 4 tested

Penetrating Oil Showdown Episode 2. Will Seafoam Deep Creep prevail?

Oil & Engine Additives

Apr 2018 · 3 tested

Is Techron better than Seafoam? Let's see the proof!

Oil & Engine Additives

Lucas Synthetic

Dec 2017 · 2 tested

Which engine self-destructs first? Zmax or Lucas Synthetic?

Oil & Engine Additives

Nov 2017 · 2 tested

Which engine self-destructs first? Lucas or STP?

Oil & Engine Additives

Jul 2017 · 3 tested

Does Restore Work? Will it Improve Engine Cylinder Compression?

Oil & Engine Additives

May 2017 · 3 tested

Is Marvel Mystery Oil Better than Seafoam? Let's find out!

Oil & Engine Additives

May 2017 · 2 tested

Seafoam--can't believe what it did to my engine episode 6--Seafoam vs ATF!!

Oil & Engine Additives

Mar 2017 · 3 tested

Seafoam--can't believe what it did to my engine!!

Oil & Engine Additives