As I understand it, oil viscosity is described in terms of weight. 75W-90
simply means the oil is formulated such that it has 75 weight oil properties
when cold and 90 weight properties when hot... The lower the number the thinner
or more fluid the oil is and visa versa. In the examples you gave below, I
can't see any reason not to go with the 75W-90... Your using synthetic so
breakdown isn't much of an issue and having a thinner or more fluid oil at
start-up only means it will get into the nooks and crannies more easily to
lubricate. The only downside I can think of is that it might be more prone to
leaks, but you'll have that covered by putting on a good gasket/seal, right?
;-)
Take this FWIW, Kyle as I'm no chemical engineer nor SAE qualified engineer
either... This is simply my understanding of oil ratings.
Tom
____________________Reply Separator____________________
Subject: DML: Differential Fluid Differences
Author: <dakota-truck@buffnet.net>
Date: 1/19/00 1:51 PM
Wow, try saying that fast 10 times...... well this post is to help me learn
what is the basic differences between two different types/weights of diff
fluid. My manual calls for 80W90 gear lube. What is the difference between
80W90 and 75W90?? I am currently using Amsoil 75W90 and I am curious if this
is bad, good, pros, cons, etc. I want to know what is the 'optimal' weight
to use? I need to order some Amsoil this week and want to know what I should
get. Thanks for any input about the 2 type mentioned here. Please dont say
aanything about other types of fluid, becuase I will only use/buy Amsoil for
my diffs. Thanks.
Kyle
93 Dakota 4x4 V6
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