01 GT Intelligent Synthetic Formula - 15W40

ACEA (Association des Constructeurs Européens d'Automobiles) is the European automotive lubricant specification body. A3/B4 is their classification for high-performance petrol and diesel engines requiring extended oil drain intervals. European OEMs like Volkswagen, Skoda, Renault, and Fiat mandate ACEA A3/B4 compliance in their service schedules. If you own a VW Polo, Skoda Rapid, Renault Kiger/Triber, Citroen C3, or any European-brand car in India, the ACEA A3/B4 certification makes the 01 GT 15W40 a compliant choice.

The API SP specification covers petrol engines, and ACEA A3 covers petrol while B4 covers diesel — so yes, this is a true petrol/diesel multi-grade oil. It is suitable for: diesel Maruti Suzuki (older Ciaz/S-Cross diesel), petrol/diesel Renault Duster, Volkswagen Vento diesel (pre-BS6), and Skoda Rapid diesel. For modern BS6 diesel cars, verify the exact OEM specification required — some require specific additive packages beyond A3/B4.

In temperatures consistently above 40°C, 15W40's slightly higher cold-start viscosity (15W vs 10W) is a minor disadvantage at start-up but the operating viscosity is the same (40-grade). In practice, the difference matters most if you're starting a car after it has been parked in direct sunlight — the 10W40 flows a fraction faster to the engine on that first turn. For all-day driving in Indian summer, both grades perform identically once warmed up.

European manufacturers using ACEA A3/B4 specification often specify extended drain intervals of 10,000–15,000 km with compliant oils. The 01 GT 15W40 is designed to support up to 10,000 km drain intervals in normal conditions. For cars with a Variable Service Interval (VSI) indicator (common in VW/Skoda), follow the indicator — it will reflect the oil's actual condition. Do not exceed 12,000 km even with synthetic-blend oil under Indian driving conditions.