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Mobil 254 vs Mobil Jet II

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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!

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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.

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