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Engine & Oil Additives

58 engine & oil additives from Liqui Moly, Lubegard, Hot Shot's Secret and more.

Recommended Engine & Oil Additives

A/C Pro

1 oz

+UV dye helps find oil, fuel, and fluid leaks
+Works in engine oil, transmissions, and power steering
+1 oz size treats a small system
−Small 1 oz size covers only one treatment
No price recorded yet.
Vizela
+Two-pack gives two 120ml bottles
+Designed to clean exhaust system pipes and catalytic converters
+Works with both oil and fuel systems
−Small 120ml capacity per bottle
No price recorded yet.
Kanlube

5 oz

+Contains WS₂ and MoS₂ anti-friction ingredients
+Labeled for high mileage gasoline engines
+5 oz bottle for smaller oil changes
−Small 5 oz volume treats limited oil quantity
No price recorded yet.
Hot Shot's Secret

32 oz

+Large 32 oz bottle treats 16 quarts
+Formulated to reduce wear and restore power
+Designed as a stiction eliminator oil additive
−Larger bottle takes more storage space
No price recorded yet.
Yamaha

12 oz

+Fuel stabilizer and conditioner for outboard engines
+12 ounce bottle for storing fuel over time
+Designed for use in outboard motors according to the product name
−Only treats fuel, not engine oil or other engine parts
No price recorded yet.
Spicer

4 oz

+Friction modifier made for limited slip differentials
+4 oz bottle for a small, measured dose
+Designed for Posi differentials specifically
No price recorded yet.
Archoil

16 oz

+Two 16 oz bottles in one pack
+Friction modifier for Powerstroke engine treatments
+Each bottle covers one treatment, per the title
No price recorded yet.
Atom Oil

16 oz

+Nano technology formula
+Designed for high mileage engines
+Comes in a 16 oz bottle
No price recorded yet.
Bardahl

16 oz

+Thick formula fills worn tolerances
+Designed to stop oil burning and leaks
+Comes in a 16 oz bottle
No price recorded yet.
Hot Shot's Secret

32 oz

+Friction reducer with nano-lubricant wear protection
+Large 32 oz bottle for repeated use
+Reduces friction within the engine
No price recorded yet.
Hot Shot's Secret

8 oz

+Friction reducer oil additive in an 8 oz bottle
+Treats 5 quarts of oil per bottle
+Reduces friction and wear in the engine
No price recorded yet.
Liqui Moly
+Engine flush formula for cleaning out old oil residue
+250 ml bottle for motorbike engine service
+Compact size suited to a small motorbike oil system
No price recorded yet.
Liqui Moly
+Ceramic-based additive for wear protection
+Suitable for petrol and diesel engines
+300 ml bottle size
No price recorded yet.
Marvel Mystery Oil

48 oz

+Two-pack of 48 ounces total for repeated use
+Cleans and lubricates the fuel system
+Works as both engine oil and fuel treatment
No price recorded yet.
Motor Purr
+Cleans engine crankcase and automatic transmission
+Formulated to expand seals
+7.5 fl oz bottle for a single treatment
No price recorded yet.
Motul
+Works for both gasoline and diesel engines
+Helps remove sludge and improve oil flow
+300 ml bottle for a single treatment
No price recorded yet.
Prolube

16 oz

+Engine oil additive for gas and diesel engines
+Advertised to reduce wear, noise, and vibration
+Advertised to boost fuel economy
No price recorded yet.
Rislone

11 oz

+Real zinc ZDDP supplement for engine oil
+Supplies zinc for older engine oil compatibility
+Comes in an 11 ounce bottle
No price recorded yet.
STA-BIL
+Protects against ethanol in fuel
+Cleans carburetor and injectors
+Sized at 16 fl oz for small engines
No price recorded yet.

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Spec scores, pros and cons, and prices are explained in the How it works section of the About page.