I'll have to agree with Max. Because as I mentioned in my email, I remember
being reluctant to using multi-viscosity oils back in the late 70s, because
they were new and I was a skeptic. And yes, it does not really matter at
all under some conditions. The idea behind the multi-viscosity oils is that
they would really maintain a certain viscosity under a large temperature
range instead of being really thick when cold and thin when hot. This
particularly happens in really cold temperatures when I remember how the
40w oil I used to use would not pour out of the container when it got near
zero degrees (F) or so. The multi-viscosity oils have a much lower pour
point as we call it. For you guys that live were it really doesn't get
cold, I doubt you would see much difference between a 30W or 40W oil and
20/50 under normal use.
David Councill
67 BGT
72 B
At 12:07 PM 11/7/2003 -0800, Max Heim wrote:
>Because multi-grade oil DIDN'T EXIST when these were designed, so they were
>obviously NOT designed with it in mind. The fact that BL, after the fact,
>included it in their recommendations doesn't mean they understood the
>issues; judging from their track record, they probably just took the
>easiest/cheapest way out, or jumped on the new trendy bandwagon, or just
>figured it didn't matter.
>
>And it doesn't matter all that much, I suppose. But if 30wt is just as
>effective for the purpose, and lasts longer, and is also cheaper, I don't
>understand the blind insistence on using 20w50.
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