Originally Posted by
NeilM
Nope, it's a function of how long it actually takes the oil to come up to temperature on these engines. Big cast iron block plus generous oil capacity equals lots of thermal mass.
I've measured mine both at an oil distribution block on the oil filter housing and in the oil pan. Readings aren't very different between the two places, so it's more a matter of convenience. The oil filter housing area was a bit crowded when I had both oil temp and pressure senders there, plus the low oil pressure warning switch and the VANOS line, so I found it tidier to remote mount the oil pressure and move oil temp to the pan. YMMV.
Neil
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