High-mileage oil in older cars
1 of 1
Special filter juices up your oil
Install a high-mileage oil filter to
boost the effectiveness of HM oil.
Old cars can actually benefit more from high-mileage
oil than newer models. Combustion
gases always leak past the piston rings
and into the oil (even in new engines).
The gases then condense to form corrosive
acids. New engine oil contains
enough acid neutralizers, anti-corrosion
agents, detergents and foam inhibitors
to counteract the effects of normal
blow-by. But the extra blow-by in older
engines causes the additives to wear
out sooner. That’s where high-mileage
(HM) oil comes in handy.
HM oils (about 75¢ more per
quart) are formulated to handle
the extra load and are well worth
the money. To get even greater
protection, add a high-mileage oil
filter, too (the Fram HM is
one choice; available through our affiliation with amazon.com). High-mileage filters contain
a capsule of additive gel that dissolves
slowly over a 3,000-mile
period. So it continually feeds new
additives into the oil. Together,
HM oil and an HM filter add less
than $7 to the cost of an oil change.
It’s a good investment to keep your
old wreck running longer.