helib 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 comment Share on other sites More sharing options...
GrayHorizons Posted September 17, 2018 Report Share Posted September 17, 2018 https://www.exxonmobil.com/en/aviation/products-and-services/products/mobil-jet-oil-254 https://www.exxonmobil.com/en/aviation/products-and-services/products/mobil-jet-oil-ii refer to your manual on the mil spec required if you can use it or not Quote Link to comment Share on other sites More sharing options...
helib Posted September 17, 2018 Author Report Share Posted September 17, 2018 Thanks a lot GH - really appreciated! Quote Link to comment Share on other sites More sharing options...
Heliian Posted September 17, 2018 Report Share Posted September 17, 2018 Jet 254 is a higher thermal stability oil (HTS). It will produce less carbon buildup and maintain viscosity to a higher temp. The important thing is to pick one and stick with it from the start. Using 254 in an engine that was running jet II or 2380 will dislodge carbon deposits which can cause blockages and bearing failure. The manufacturers have laid this all out in their manuals. 2 Quote Link to comment Share on other sites More sharing options...
Lox4 Posted August 23, 2019 Report Share Posted August 23, 2019 If i mistakely add one tin of mobil jet oil 254 into an engine which normally use mobil jet ii; will have any bad effect on engine? What action should be taken on this regard? Quote Link to comment Share on other sites More sharing options...
R0T0R Posted August 23, 2019 Report Share Posted August 23, 2019 Park it in the bush somewhere and put a lit match in the fuel tank. Then, go get yourself an AStar! 1 Quote Link to comment Share on other sites More sharing options...
Heliian Posted August 23, 2019 Report Share Posted August 23, 2019 6 hours ago, Lox4 said: If i mistakely add one tin of mobil jet oil 254 into an engine which normally use mobil jet ii; will have any bad effect on engine? What action should be taken on this regard? I'm going to say that the system will have to be drained and filled and inspected for carbon in the strut/scavenge and filter. I would call a turbine shop to find out more though. 1 Quote Link to comment Share on other sites More sharing options...
DGP Posted August 23, 2019 Report Share Posted August 23, 2019 15 minutes ago, Heliian said: I'm going to say that the system will have to be drained and filled and inspected for carbon in the strut/scavenge and filter. I would call a turbine shop to find out more though. I would have to agree with Heliian but somewhere I saw a list of oils that could be mixed...the 407 uses different oil in the engine and trany but when you have a freewheel seal leak these oils will be mixing which I have seen many times...doesn't seem to be a problem. It has something to do with the mil specs I believe but hey what do I know...check with the manufacturer. Quote Link to comment Share on other sites More sharing options...
GrayHorizons Posted August 23, 2019 Report Share Posted August 23, 2019 follow the manual for the procedure to "change" oil types in chapter 12. it involves running, flushing and filter servicing. Quote Link to comment Share on other sites More sharing options...
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