Well, the on, and off, list opinion seems to be that using an organic oil is
best for the run-in period, There seems to some discrepancy as to what the
run-in period should be and how it should be done. The consensus is that,
and it makes sense, the rings won't seat properly if a syn oil is used
during the first, 500 - 8000 miles (quite a range, huh?) the rings won't
seat properly. Has to do with the "slickness" of the oil. Syn is too slick.
So I will use an organic oil for the first grand or so. Then go to the syn,
just cause I like it. The OP stays higher when warm with Mobil 1 than with
either Castrol or Valvoline 20-50. Well that is my experience. Or That's my
story and I'm sticking to it. I always like the Valvoline 20-50 over the
Castrol because it seems to hold the OP better. Maybe right, maybe not,
maybe buggers, maybe snot.
I changed to the syn in the first place because, as I understand it, it
handles higher temps better. That is that it does not loose it's lubrication
abilities at a higher temp as opposed to an organic oil. When I first
switched over to an electric fan, instead of the water pump driven one, I
was experiencing a higher than, what I perceived to be normal, temp. Found
out later that my temp sender was bad. But anyway, I find that the syn oil
seems to hold the hi-temp pressure better than an organic based oil. So I
will be going that way in the end.
To start, run-in with organic, then switch to syn.
Thanks for all the advice, folks
BTW I sent the same question to Mobil. I will forward their response when I
get it.
Larry
>Well Hello, Boys and Girls!!
>
>And How is Everybody Today??
>
>I am getting ready to reassemble the 1500 I have that is going to replace
>the engine I have in the car now. I have a bit of a question that is sure to
>stir up a few comments.
>
>I have been running Mobil 1 15-50 in my engine for a few years. I like it a
>lot. Now on the new engine I want to continue to run Mobil 1. However I am
>unsure of using it for running in the engine. I don't really see an issue
>with it, but I have not heard anything about it. I have heard that using
>organic oil is preferred, but I just don't know why.
>
>Any thoughts on why I should or should not use Mobil 1 synthetic oil to run
>in a new engine??
Larry Macy
78 Midget
Keep your top down and your chin up.
Larry B. Macy, Ph.D.
macy@bblmail.psycha.upenn.edu
System Manager/Administrator
Neuropsychiatry Section
Department of Psychiatry
University of Pennsylvania
3400 Spruce St. - 10 Gates
Philadelphia, PA 19104
Ask a question and you're a fool for three minutes; do not ask a question
and you're a fool for the rest of your life.
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