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Vluo•llv
lttl:tllt•
lltlt·.
vi•,.tntt•,
wl 1 1'11
cold,
.tlld
tllin
bodied
'
Oils with two
viscosities
are called
multigrade
wltt'll W111111
lllt
l
Vl',c
c l'.tly ol
dll oil
ts expressed
oils; oils
with
only
one viscosity are termed
lty
tl•,
'•/\1
c
l.t
~:.
I
01
cold viscosity
the SAE
single-grade oils.
Slngle-grade/MuHigrade Oils
1
1.1',',
t•,
H!Vt•n '"'
c1
IIUfllbcr
and
the
letter
"W"
(,1',
111
Wlll
lt •t
), lor
llot
viscosity
the SAE
class
is
HIVI'II
!lilly
dS d
number.
lite
vtscosity of an
oil is, therefore,
always
the
same
for
a
specific temperature range if it has
the
same number of an SAE class.
E.g.:
A 10 W-30 oil and a 10 W-40 oil have the
same viscosity when cold; when hot the oil with
the
number
30
is thinner than the oil with the
number 40.
Light Running Oils
Light running oils are of lower viscosity at all
temperatures and therefore make it possible to
save a certain amount of fuel.
Light running oils, which have to be
suitable
for
year-round use, require a particularly high ther-
mal
stability.
Oils with this kind of performance are
non-con-
ventional engine oils and are termed "all
season
fuel economy oils" in the Porsche
approval.
65
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