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It's interesting that the Amsoil SDF-15 has been a subject of the
SAE HS806 test in a different periodical. It proved superior
over Mobil,Pure 1,HardDr,AC,Napa,Fram,and Wix, in both
efficiency and capacity. I can provide the specs and
filters to whoever is interested.

oil filter quality study-good reading
Parts and Repair
Replies 18 Post by wyante

Reads like you have a very knowledgeable group of people here. Let me say the synthetic
basestock oils out perform the petroleum in many factors , two of which are thermal
stability ( ASTM D5800) and wear prevention (ASTM D4172). Both of these
properties mean a constant viscosity over a wider temperature range, and protection
from wear for your engine. The manufacturing engineers set the viscosity requirements
based on bearing clearances and oil galley sizes. As you probably know the oil plays
an important part in carrying destructive heat away from mains and rods. There
has to be a minimum flow rate, or the bearings will overheat and fail prematurely. An oil
with an inferior thermal stability will boil away and become thicker. In some cases
a 40W can become a 60W. Thus flow rate slows and heat builds. Wear prevention
is especially critical considering the significant bearing loads caused by the 22:1
compression forces caused by the pistons. Synthetics beat the petroleum�s hands down.
I am biased, I sell synthetics and I�ve seen the independent oil analysis prove it over
millions of hours of engine operation hours. Let me know what your manufactures
requirements are for viscosity , and I�ll tell you my recommendations.

Winter Oil
Parts and Repair
Replies 37 Post by wyante