^^^ Easier to go back to the flat gasket design than try to make sure everyone correctly installs a filter with a P-style gasket.
I was active on a Ferrari email chat board and people were cranking them down, it really didn't make a difference. They could have avoided a recall and simply updated their instructions on the can and the box. Ferrari could have issued a TSB, if that were the case.
There is a guy on there, Steve Magnusson who did all the measurements (he's a mechanical engineer)...it was clear the groove was too shallow and the gasket too tall (gasket was D shaped, not P shaped)..so there was too much gasket unsupported was his analysis (softer gasket material too). Also the seal groove is about 1 cm inside from the outer ridge of the can. And the outer ridge is higher by a few mm than the inner groove, so you are limited how tight the seal will be, as the can will bottom out before the inner seal and groove supporting it. So more of a design flaw than incorrect instructions. This was all 25 years ago, so this stuff is only now coming back to me...
Ferrari and UFI took them all back.
I found the recall:
FERRARI
Ferrari North America
Models: Oil Filter 111782
Number Involved: 2,790
Dates of Manufacture: May 2000 - May 2001
Defect:
Some replacement oil filters (Ferrari Part No. 111782) were made in a
different manner from the original version. As a result, the oil
filter may leak engine oil from the seal ring area. In the presence of
an ignition source, the engine oil could be ignited, causing a vehicle
fire, possibly resulting in personal injury or death. These oil
filters can be used on Ferrari model vehicles dating back to the
1960s.
The model vehicles these filters can be used on are:
Dino 206 GT, Dino 246 GT/GTS, Dino 308 GT4, 208 GTB/GTS turbo, 208
GT4, 208 GTB/GTS turbo intercooler, GTB/GTS turbo, 275 GTB4, 308 GT4,
308 GTB/GTS, 308i GTB/GTS, 328 GTB/GTS, 330 GT, 330 GTC, 365 GT, 365
GT4, 365 GT4BB, 365 GTC (1970), 365 GTC/GTS, 365 GTC4, 365 GTS4, 400I
GT/GTA, 4000 GT/GTA, 412 GT/GTA, 512BB, 512i BB, Mondial 3.2, Mondial
3.2 Cabriolet, Mondial 8, Mondial 9 Cabriolet, Mondial 4V, 288 GTO.
Remedy:
Dealers will replace the oil filters with a new style of oil filter
having a Ferrari part number of 191993, free of charge. The
manufacturer has reported that notification began Oct. 12, 2001.
Owners who do not receive the free remedy within a reasonable time
should contact Ferrari at 1-201-816-2600.
[NHTSA Recall No. 01E051]