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General Basics | Oil Shelf Life & Guidelines for Opened Containers

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✅ Official Standard: Please refer to page 36 of the *AeroShell Manual* (20th Edition), specifically the sections regarding shelf life, periodic inspections, and re-testing. Shelf life validity is contingent upon the packaging remaining intact, undamaged, and unopened, and the product being stored in a sheltered environment with a constant ambient temperature.

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⚠️ Important Notice: Once the product is opened, a fixed shelf life no longer applies. Shell cannot control storage conditions after opening and therefore cannot guarantee product quality.

Piston Engine Oil | Key Frequently Asked Questions

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❌ Absolutely not! That is a major misconception!

✅ 50% Synthetic Base Oil: Delivers exceptional low-temperature fluidity, rapidly forming an oil film during cold starts to minimize damage from dry friction.

✅ Mineral Base Oil: Dissolves combustion byproducts from leaded gasoline, effectively preventing piston ring sticking, carbon deposits, and sludge buildup.

✅ Dual-Formula Advantage: Combines excellent cold-start performance and high-temperature stability with superior anti-wear and cleaning properties—making it a top-tier, all-season lubricant.

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◆ High-frequency flying: Simultaneous replacement of engine oil and filter every 25 flight hours (optimal maintenance protocol).

◆ Low-frequency/Storage: Mandatory oil change every 4 months, regardless of flight time.

◆ Critical requirement: Oil pressure must be established within 15–20 seconds after an oil change; if no pressure registers, shut down the engine immediately to investigate. Running the engine without oil pressure causes damage that far outweighs the protective benefits of frequent oil changes.

◆ Maintenance detail: The used filter must be cut open and inspected at every replacement; this is a key method for monitoring engine health.

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✅ The entire SAE-certified AeroShell piston engine oil range is fully compatible and allows for temporary mixing or interchangeability.

✅ Seasonal switching between summer-grade (single-viscosity) and winter-grade (multi-viscosity) oils is permissible without requiring engine flushing.

✅ Following a major overhaul or cylinder replacement, mineral oil may be used temporarily for a 50-hour break-in period.

❌ Critical Restriction: Do not switch directly to ashless dispersant oil in high-time engines that have long operated on straight mineral oil; doing so can dislodge accumulated carbon deposits and lead to engine failure.

◆ Short-term storage (intermittent flying over a few weeks): Use 15W-50, W100 Plus, or W80 Plus directly; these contain potent anti-rust and anti-corrosion additives.

◆ Long-term preservation (storage over winter or summer months): Fluid 2XN preservation fluid mixed with mineral break-in oil (1:3 ratio).

⚠️ Preservation restrictions: A single flight using this mixture must not exceed 2 hours, and the total flight time using this mixture over the aircraft's entire service life must not exceed 50 hours; for radial engines, ground runs are permitted, but flight is prohibited.

◆ 15W-50 Multigrade Oil (Top Recommendation): Offers vastly superior low-temperature fluidity compared to straight-grade oils, eliminating dry friction during cold starts and lowering operating temperatures; suitable for high-altitude, high-temperature, aerobatic, and turbocharged engines; all-season use with no need for oil changes.

◆ W100/W80 Straight-Grade Oil: Offers stable performance and suitable operating temperatures; ideal for aircraft flown frequently (weekly); highly cost-effective.

✅ Key Advantages of HPC High-Performance Turbine Oil

1. Extremely low tendency to form deposits (dual resistance to coking in both liquid and oil-mist phases)

2. Superior oxidation resistance and resistance to thermal degradation

3. Compatible with a wide range of rubber elastomers (excellent compatibility)

4. Stable load-bearing performance and precise technical specifications