sometime since the 50s or 60 the recommended change went from
"every other oil change"
to
"every oil change".
i never saw a technical reason.
oil is better now. gas probably is cleaner too.
my guess it is a marketing thing. plus filters are cheaper now I think in constant dollars
"every other oil change"
to
"every oil change".
i never saw a technical reason.
oil is better now. gas probably is cleaner too.
my guess it is a marketing thing. plus filters are cheaper now I think in constant dollars