Multi-grade oils are preferred by some aircraft enthusiasts for their increased Viscosity Index (VI). This value refers to the ability of these oils to change their viscosity, or relative thickness, depending upon the temperature – this makes them ideal for cold-temperature start-ups.
Multi-weight 20w-50 oils are primarily used as break-in oils, but some may be used for both break-in and normal operation – however (and this is extremely important), be mindful of product data sheets and OEM specifications to ensure you are not potentially putting your engine, your aircraft, or yourself at risk. In sum, it is best to have specific oils dedicated to engine break-in as well as normal engine operation.
These oils meet some of the following requirements (check product data sheets to determine which oils fulfill which specs and standards):
Teledyne Continental Material Specification MHS-24B, SAE Standard J1899, SAE Standard J1966, QPL approval number: N06L1-20W-50 (Type M), U.S. Military Specification MIL-L-6082 (obsolete), Pratt & Whitney Service Bulletin No. 1183 Rev. U, Avco Lycoming Material Specification No. 301G, and U.S. Military Spec MIL-L-22851D (obsolete) for additive treatment.
QPL Approval Numbers: D07L1-20W-50 (X/C 20W-50)
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