[Christoph]

I used non-detergent 50 in my old and worn-out-engine for summer operation
No filter; New oil every 800miles.

As requested, I do use 10 W40 with my actual engine all around the year
With filter and one change each year (about every 6000 miles)

Have fun
"Tired" does not mean it is going to fail soon....
Dont push and it will go lots of additional miles.