Quote:
Originally posted by Lubrecon
Webebob: I must have missed the story on Mobil having to buy 1,000 aviation engines because of them using a "synthetic". Were these jet engies or recips? General avaition or commercial? Would you point me to where I can get the skinny on this. The only synthetic that I know of that Mobil sells to the aviation inductry is Mobil Jet Oil II. It is a polyol ester, nothing like Mobil 1, that is a PAO. It has been around for many years and has been a standard for jet engines during that time. There are other companies that have jet engine oils also, and nothing but synthetics are used in jet engines that I am aware of.
Jerry
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The damage was to piston engine aircraft.
The
oil was Mobile AV-1,
synthetic aviation
oil.
The problem was worse in the larger 360+ cubic inch engines (hmmmm - cobra size engines.)
Mobil agreed damage to the top-end of the engine, including sludge buildup, piston ring malfunction and piston blow-by resulting in cylinder/piston damage and high oil consumption.
They denied it caused any of the FAA documented damage to cams, cranks, rods... that was considered overwelming by the FAA.
The FAA yanked Mobils permit to sell the stuff for gen aviation in May 1996. See FAA General Aviation Airworthiness Alert AC 43-16.
Of course there was a class action lawsuit. Mobil replaced users with continetal engines larger than 360 cubic inches.
The formula was later modified and re-released to the market. It does not appear to be having such troubles now.
Something like that.
Bob