Hi all, recent registree long time reader.
Id like to extend my oil drain time so heres the plan I 'came up with'.
Synthetic Oil (usually mobil 1 5w30, I recently put in Valvoline Syntec 5w30)
change filter at 3100 miles (add oil as necessary, I figure about 1 qrtr)
change oil & filter at 7200 miles.