Cooper wrote:

"Cooper" wrote

If you search the net for car oils, manufacturers recommended detergent

oil

for older cars. You will find lots of information where people swear by

the

multi viscosity oil instead of detergent.



Should read "manufacturers recommended _non detergent_ oil for older cars."

That is true for older cars without rebuilt engines. If it's rebuilt,
start and stay with detergent oil. The problem is in an old engine they
are counting on a buildup of sludge and varnish, which actually helps
the rings seal and give it good compression. Change to detergent oil
and it cleans away the sludge, reducing compression, then it doesn't run
as well.

--
Tony