I notice a slightly rattling noise which is addressed to the Getrag221 box. It appears only when turning off the ignition at good working temperature- never when cold. Google Lens (!) (AI) recommends to change gear oil to Red Line MTL 75W80 instead of Mobil ATF LT 71141 automatic transmission fluid which I am currently using. Opinions?? However, the Getrag box gear change is silky smooth so no problem as such.
Thank you for your replies

2005 Roadster 3.0 S1
1960 MGA Roadster

Regards Aage