ZDDP Additive Services:
- ZDDP additive installation during oil change service for pre-1974 engines
- Oil service using manufacturer-recommended oil combined with ZDDP protection
- Engine lubrication assessment for classic and collector vehicles
- Preventative maintenance guidance for older engine designs
- Inspection of engine condition during routine service visits
- Consultation on maintenance schedules for classic vehicles
- Safe, proper dosing of ZDDP additive based on oil capacity
- Ongoing maintenance support for long-term engine preservation
Owning an older vehicle means preserving not only its appearance, but also the performance and longevity of its engine. Engines built before 1974 were designed to operate with higher levels of zinc and phosphorus in motor oil, which helped protect critical internal components from excessive wear.
At Shade Tree Garage, we stay current with modern automotive technology while also respecting the needs of classic engines. Preventative maintenance is a cornerstone of our approach, and we provide honest guidance to help protect your vehicle for years to come.
That is why we offer ZDDP additive service for qualifying older engines as part of routine oil change maintenance.
Why Is ZDDP Important for Older Engines?
ZDDP (Zinc Dialkyl Dithiophosphate) is a lubricant additive that provides essential protection for flat-tappet camshafts and other high-pressure engine components commonly found in older vehicles.
Modern motor oils no longer contain sufficient levels of ZDDP because newer vehicles with catalytic converters require low-zinc oil formulations. While this protects modern emissions systems, it can lead to accelerated wear and damage in older engine designs that depend on ZDDP for proper lubrication.
Without proper protection, internal engine components in classic vehicles can experience premature wear and costly damage.Classic Car Owners
Protecting Your Engine with Proper Maintenance
For owners of pre-1974 vehicles, the solution is simple. When you bring your vehicle to Shade Tree Garage for routine oil service, we can add the proper amount of ZDDP additive to protect your engine.
A single 4-ounce bottle of ZDDP additive provides the correct concentration for most 4- to 5-quart oil changes. The small additional cost is a worthwhile investment when compared to the potential expense of engine repairs caused by insufficient lubrication protection.
Our technicians ensure the correct application so your engine receives the protection it was designed to have.
Why Choose Shade Tree Garage for Classic Vehicle Care
- Technicians familiar with older engine designs
- Preventative maintenance focused on long-term preservation
- Proper oil and additive selection for classic vehicles
- Honest recommendations tailored to your vehicle’s needs
We understand that classic vehicles require a different level of care and attention, and we take pride in helping owners protect their investment.
If you own a classic or collector vehicle built before 1974, proper oil formulation is essential to protecting your engine. Whether you are due for an oil change or would like to learn more about ZDDP additive service, our team is here to help.

Contact Shade Tree Garage today to schedule your next service or to purchase ZDDP additive for your vehicle. We are proud to support the long-term care and performance of the vehicles that enthusiasts love.
