Simply adding these metal fins to the oil pan has kept my oil temps about 10 -15* cooler, confirmed on two different 370's.
They use a special heat conductive adhesive (not regular 3M tape!), and it does help pull heat away, as would be expected and as advertised.
I have 2-3 all over the underside of the oil pan and another couple on the dif. On the dyno, oil temps drop down faster between pulls with them as well.
In normal somewhat spirited driving in FL i typically see temps around 200* - 205* F tops, and logged around 207* F on Cipher. In prolonged drives in the heat -- 220* tops. I've never seen it go past that after the fins were added, whereas before it might creep as high as 235* -- still not hot enough to really worry, but the fins are very cheap and do actually work as claimed.
I also have two stuck on my diff cover
