What oil/oil filter are you guys running in your stock 340's?

Ironracer said
I had a guy tell me that synthetic oil, you only have to change it every 7,000 miles. In my opinion, that's just still just as filthy after 2500 miles

I went over a 150K with synthetic oil changed around every 7/7.5K. (6 months) with only a oil filter change 3 months in between at 3 months. I just filled the oil filter up, run it a minute or so. Check hours later and top of IF needed. The engine never or burned leaked oil.

ch1ll said
only as filthy as the quality of filter you use.

EXACTLY!!!

jimharvard said
i never thought about the clear plastic fuel filter. i suspect the plastic can degrade and crack and start leaking gas. thanks for the suggestion, i will change that.

I don’t know why a new ruin was made about a plastic filter. After a while -years- it will crack unless subjected to a lot of heat. The like they clear filter for diagnostic reasons should I need to know...

Otherwise, looking good or not, it gets changed out every spring. It just makes good sense. Cheap as heck too! Why not?!?!

Oil wise, non leaking engines get the synthetic. 5 or 10/30. There all roller engines FWIW.
FT cam engines, Brad Penn 10/30.
Old Leaking/burning oil engines, cheap dyno oil.