Boiled Linseed oil to preserve patina?

[Willowrun]

I use Penetrol on dried out paint as needed. I gently clean with Griot's first then give a heavy coat of Penetrol. I just cleaned and lubed up this off-brand a couple days ago. I just try to preserve what is there and otherwise not mess with it. Best thing for old paint is to keep it out of the weather.
For the frames and undercarriage I use Boeshield T9.