Max Heim wrote:
See below,
> Because multi-grade oil DIDN'T EXIST when these were designed, so they were
> obviously NOT designed with it in mind.
I'm skeptical about that, Max. Seems like I could get 10W-30 Havoline
in '59 when I drag racing a '57 Chevy in A-Stock class. When was the LH
overdrive first produced?
> 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.
I don't believe that argument holds water. After all, practicing
engineers are supposed to keep up with the state of the art. If they
change the oil recommendations, they don't do it out of sheer caprice.
Could it be you're confusing the BL bean counters with the engineers?
> 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.
Additives don't wear out; they become saturated by combustion
byproducts, etc. In a tranny, they should last for an extended period of
time. I've never seen anything that said that multi-vis oil becomes
uni-vis after a period of use. Have you? Single-vis oil isn't
mnaterially cheaper and is getting hard to find, as is non-detergent
oil. If detergent oils keep things clean by keeping bad stuff in, why
not use it?
To answer your question, I use 20W-50 because I live in a climate
where it gets very hot but not very cold. It seldom gets to 20 F around
here and my B is garaged anyway but it gets over 100 in the summer.
When I lived in the high desert, in the winter I used 10W-30 in the
daily driver '70 B I had then, in both the engine and overdrive tranny.
You're right that it doesn't matter to me 'n thee. But it might cut
the confusion, for the new LBC owners just coming in, for us to discuss
it on the forum.
Peace,
CR
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