The Only Shop
In America With
SOD-1 Plus.
SOD-1 Plus is a premium ester-based engine oil additive from Japan — built on the same ester chemistry trusted in jet engines for over 50 years. Grand Tires is the exclusive mechanic shop in America offering this treatment with your oil change.
What SOD-1 Plus
Does For Your Engine.
Reduces Friction
마찰 감소Ester molecules bond to metal surfaces, cutting friction and wear on internal engine components — protection that lasts between oil changes.
Cleans Sludge
슬러지 제거Dissolves and cleans existing sludge and carbon deposits, restoring smoother operation in high-mileage engines.
Restores Seals
씰 복원Reconditions hardened gaskets and seals, helping reduce oil leaks and consumption in older vehicles.
Improves Fuel Economy
연비 향상Documented fuel efficiency improvements of up to 4.79% — the additive can pay for itself at the pump.
Resists Oxidation
산화 방지Slows oil breakdown under heat, keeping your oil performing like new for longer between changes.
Quieter, Smoother Running
부드러운 주행Customers commonly report quieter idling and smoother acceleration after treatment — especially on engines past 80k miles.
Meet The Team
Behind SOD-1.
This isn't a product we ordered from a catalog. We met directly with the SOD-1 Plus team, learned the treatment from the people behind it, and tested it on vehicles in our own shop before offering it to a single customer.
SOD-1 Plus is made in Fukuoka, Japan by D1 Chemical — a family business, just like ours — and trusted by thousands of professional shops worldwide.
SOD-1 팀과 직접 만나 제품을 배우고, 저희 매장에서 직접 테스트를 거친 후 고객님께 제공하고 있습니다.
- Trained by the source — correct application ratios for every engine and transmission.
- Tested in our own shop — we verified the results firsthand before offering it to customers.
- Backed by real science — ester chemistry documented in published university studies.
Ideal For High-Mileage
& Hard-Working Engines.
SOD-1 Plus benefits nearly every engine, but the difference is most dramatic where engines work hardest.
- High-mileage vehicles (80,000+ miles)
- Fleet & commercial vehicles that can't afford downtime
- Vehicles with minor oil leaks or oil consumption
- Older engines with rough idle or noise
- CVT & automatic transmissions — ask about ATF treatment
- Fully compatible with conventional, blend & full synthetic oil
Added To Your
Regular Oil Change.
Call us or book online — mention SOD-1 Plus, or just ask about it when you arrive.
SOD-1 Plus is measured for your engine size and added with your fresh oil — no extra appointment needed.
Most drivers notice smoother, quieter running within the first tank of fuel. The protection works continuously until your next change.
Give Your Engine
The Jet Treatment.
Available exclusively at Grand Tires & Arirang Auto Care in Duluth — nowhere else in America. Ask us about single treatments and fleet programs. 미국에서 오직 저희 매장에서만 만나보실 수 있습니다.