is this good for modern cars? whats zddp for

Answers one and two are correct. Older engines (classic cars for the most part) with older style tappets. This is an oil additive. Has nothing to to with fuel system ant Cats. nor is their any such precaution from the manufacturer.

Can you use it with syntetic oil?

Yes, Rislone is compatible with and works with all petroleum-based motor oils including conventional, high mileage and synthetic formulas.Eric

Can you use this in atv engines?

Yes..... It is compatible with all motor oils..... and engines..... Use an appropriate amount... Smaller engines of course wouldn't need the entire bottle at once.

How much zinc is in this? The back of the bottle does not tell you the numbers only oil dilutions directions.

Its enough zinc to protect your engine from excessive friction, for one oil cycle or 3000 miles.

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⚙️ Keep your engine young, powerful, and unstoppable!

FRICTION FIGHTER - Minimizes wear during cold starts for a smoother, cooler engine run.
PISTON PROTECTOR - Prevents piston scuffing by stabilizing oil viscosity under extreme conditions.
POWER PACKED ZINC BOOST - Elevates ZDDP levels to protect critical engine parts like camshafts and lifters.
PROUDLY MADE IN THE USA - Quality you can trust, supporting domestic manufacturing excellence.
ENGINE LONGEVITY ENHANCER - Clings to bearings and valve train components, ensuring lasting lubrication where normal oil falls short.

Rislone 4405 Engine Oil Supplement is a high-performance additive that boosts zinc and phosphorous levels to protect vital engine components. It reduces friction and wear, especially during startup, prevents piston scuffing by stabilizing oil viscosity, and extends engine life by providing superior lubrication. This 11 oz concentrate is made in the USA and designed to keep your engine running cooler and longer.

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Manufacturer	Rislone
Brand	Rislone
Model	4405
Product Dimensions	4.57 x 7.62 x 16.76 cm; 331 g
Item model number	4405
Manufacturer Part Number	4405
Item Weight	331 g

Rislone 4405 Engine Oil Supplement Concentrate with Zinc Treatment - 11 oz, Yellow

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