synthetic oil

[julius <elprofe@caribe.net>]

first,i give big HI'to all of you i'm new on this page.MR allan jones
in answer about sinthetic oil,in all audi come with high quality engine
oil 15w40 for all season.in the owners manual they said "your engine was
factory with an allseason high quality engine oil.IF YOU NEED TO ADD OIL
BETWEEN OIL CHANGES USE HIGH QUALITY PETROLEUM OR SYNTHETIC BASE OIL
WITH CORRECT SPECIFICATIONS".when buy oil in container musy appear this
designation singly or in combination. API service SF (or
higher).e.g.15w40 or sae 40 just a remainder API means AMERICAN PETROLUM
INSTITUTE. SAE means SOCIETY AUTOMOTIVE ENGINEER.15W40 is multigrade oil
sae 40 is singlegrade oil.
other question was,synthetic oil are desing for engine the answer is yes
all engines oil and let me specific petroleum and syntetic are't make in
the same way.even not all synthetic oil are make too in the same way.
for  e.g. castrol 5w50 is a blend highly refine petroleum oil.so this
mean that this oil is not the best in synthetic but is superior for some
petroleum base.the same thing is with petroleum base.e.g.valvoline10w30
or SAE 40.petroleum base contain wax that take petroleum oil in very
cold whether and have less fluidity (viscosity).well that it for now if
you want more inf. about synthetic oil send to me a physical addres i'm
very happy send it to you. my name julio c negron VW & AUDI technician
from PUERTO RICO.