helib 5 Posted September 16, 2018 Report Share Posted September 16, 2018 What is the difference between Mobil 254 vs Mobil Jet II? And can you run either in a Jetranger engine? Thanks a lot in advance for any info on this! Quote Link to post Share on other sites
SwingWing 18 Posted September 17, 2018 Report Share Posted September 17, 2018 254 is a third generation synthetic. Mobil Jet 2 is second gen. With C30/ C47 running third gen simplifies you’re 150hr eng. insp. Not sure about C20 should be able to find in manual. Quote Link to post Share on other sites
helib 5 Posted September 17, 2018 Author Report Share Posted September 17, 2018 Thanks SW - very much appreciated! 1 Quote Link to post Share on other sites
ray 68 Posted September 17, 2018 Report Share Posted September 17, 2018 It's ok in C20 as well. If you're running 254 with an STC'd external oil filter, you can extend oil changes to 600 Hours/12 Months. 1 Quote Link to post Share on other sites
helib 5 Posted September 17, 2018 Author Report Share Posted September 17, 2018 Great info - thx! Quote Link to post Share on other sites
helidom 3 Posted September 17, 2018 Report Share Posted September 17, 2018 Be aware that a C20 will leak far more when operating 254 as opposed to the Jet II! Quote Link to post Share on other sites
ray 68 Posted September 17, 2018 Report Share Posted September 17, 2018 The new seals seem to be holding fine. We run 254 in our C20/ C30, no leaks. Quote Link to post Share on other sites
R0T0R 519 Posted September 17, 2018 Report Share Posted September 17, 2018 No leaks? Are you sure there’s oil in there?!?! Quote Link to post Share on other sites
simpleton 192 Posted September 17, 2018 Report Share Posted September 17, 2018 Yeah, if you're not dripping oil off an Allison....you're out of oil Quote Link to post Share on other sites
ray 68 Posted September 17, 2018 Report Share Posted September 17, 2018 Nah. Just stay on top of things. The older seals leaked a lot with 254. The gearbox was overhauled last winter, Standard Aero, running great with no leaks. 1 Quote Link to post Share on other sites
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