Good choice on the 15W-40, but no, no , no on the last paragraph.

Oils most assuredly do NOT get thicker with increasing temp, even if
they *are* non-Newtonian fluids.
Multi-grades MEET the viscosity requirement( for their grade) at low
temps AND at high temps( usually 100degC).
But the viscosity, measured in either SuS or cSt, decreases with
increasing temps..

You may enjoy hopping over to www.bobistheoilguy.com and spending some
time there. I think you'll find it worth your while. You may want to
also consider Shell Rotella synth 5W-40, and asking your mfrs about
extended drain schedules.

--

"LaBomba182" wrote in message
...
| Subject: 40W oil causing wear problems over 30w?
| From: Bruce in Alaska
|
| (LaBomba182) wrote:
|
|| Thanks, I saw that in the eng. and genset manuals and that's what we
will end
| up doing. Filling the clean oil tank with 15-40W and keeping 40W in
bottles
| and/or pails for the trannys.
|
| Based on this I still can't see how straight 40W would hurt the
gensets in any
| way.
| As long as the ambient temps stay high.
|
| Hell, multi weight oils start out at their low number and get more
viscous as
| their temp rises.
|
|
|
| Capt. Bill