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In article ,
(JAXAshby) wrote:

snipped because I have another point to make

One other thing to remember in diesel engine operation, is
that the Base oil in a diesel engine is also designed as
part of the engines cooling system. Most larger (bigger
than 100Hp) engines have oil heat exchangers that run at the
temps of the cooling system. Oil Temps usually are 35 to
50 Degrees F higher than the cooling system temps found in
an engine. Today's Multiviscosity Oils are formulated to
allow for heat transfer from the friction parts out thru
the cooling system. Higher than normal oil Temps can
surely be a cause of concern, for premature engine failure
and something to be watchful for.

Bruce in alaska
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add a 2 before @