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--------------------------- I think I remember the hot oil change being taught as a "best practice" in A&P school, and not a requirement. The Sikorsky CH-53E, S-76, and S-92 maintenance manuals, the Bell 412 maint. manual, the P&WC PW210S and PT6T maint. manuals, and the GE CT7 maint. manual (I think Agusta, Eurocopter, and MD are similar, but it's been a while since I worked on those), all require a hot oil change as part of the required maintenance after a suspected or confirmed case of oil contamination, to include popped filter buttons and chip lights with chips found. They do not direct a hot oil change for scheduled oil changes; in fact, I've never done a hot oil change on any helicopter as part of scheduled maintenance - I've caught them still-warm a couple times, but never hot. At their formal engine school (Arriel 2S1/2S2), Turbomeca recommends a hot oil change for all oil changes, but only requires it for suspected/confirmed contamination. Granted, these are turbine engines and helicopter gearboxes, so the info isn't a direct transfer to the RV/GA world, but it does help illustrate the thought processes of OEMs. FWIW, I do hot oil changes in my vehicles, and I would do hot oil changes if I were an RV owner/maintainer. It's what I was taught as a kid and a young adult, and I personally believe it's a valid technique. |
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