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Through a stupid mistake on my part today I purchased eight quarts of 20w50
synthetic Amsoil rather than the 10w40 I normally use year-round.
Unfortunately I discovered this mistake this afternoon only after I
completed the oil/filter change.
I am concerned that this higher-viscosity oil might in some way damage my
engine. It has been about 60-70K miles from the engine's having been
professionally rebuilt and while oil pressure has fallen somewhat over the
last several years the gauge still indicates about 40 psi at 2500-3K rpm's
and about 20 psi at fast idle with 10w40, in both cases with hot oil and at
normal engine operating temperature. I took the car for a very short spin
after completing the change and I am quite sure I did not did not get the
oil up to full operating temperatures but in any case the OP did seem a few
psi higher than what I am used to seeing
At this point I have about $125.00 invested in the mistake: seven quarts
and a new K&N filter. If my fear is verified by your opinions I am
certainly willing to drain and refill--I certainly do not want to be
driving around if there is a real risk of causing damage.
I eagerly await the group wisdom.
Best--Michael Oritt
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<div dir=3D"ltr"><div class=3D"gmail_default" style=3D"color:#3333ff">Throu=
gh a stupid mistake on=C2=A0my part today I purchased eight quarts of 20w50=
synthetic Amsoil rather than the 10w40 I normally use year-round.=C2=A0 Un=
fortunately I discovered this mistake this afternoon only after I completed=
the oil/filter change.</div><div class=3D"gmail_default" style=3D"color:#3=
333ff"><br></div><div class=3D"gmail_default" style=3D"color:#3333ff">I am =
concerned that this higher-viscosity oil might in some way damage my engine=
.=C2=A0 It has been about 60-70K miles from the=C2=A0engine's having be=
en professionally rebuilt and while oil pressure has fallen somewhat over t=
he last several years the gauge=C2=A0still=C2=A0indicates about 40 psi at 2=
500-3K rpm's and about 20 psi at fast idle with 10w40,=C2=A0in both cas=
es with hot oil and at normal engine operating temperature.=C2=A0 I took th=
e car for a very short spin after completing the change and I am quite sure=
I did not did not get the oil up to full operating temperatures but in any=
case the OP did seem a few psi higher than what I am used to seeing</div><=
div class=3D"gmail_default" style=3D"color:#3333ff"><br></div><div class=3D=
"gmail_default" style=3D"color:#3333ff">At this point I have about $125.00 =
invested in the mistake:=C2=A0 seven quarts and a new K&N filter.=C2=A0=
If my fear is verified by your opinions I am certainly willing to drain an=
d refill--I certainly do not want to be driving around if there is a real r=
isk of causing damage.=C2=A0</div><div class=3D"gmail_default" style=3D"col=
or:#3333ff"><br></div><div class=3D"gmail_default" style=3D"color:#3333ff">=
I eagerly await the group wisdom.</div><div class=3D"gmail_default" style=
=3D"color:#3333ff"><br></div><div class=3D"gmail_default" style=3D"color:#3=
333ff">Best--Michael Oritt</div><div class=3D"gmail_default" style=3D"color=
:#3333ff"><br></div></div>
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