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Ah-h-h; something doesn’t compute here, at least not for
me. Did you start from the same temp? Was the air a lot
cooler? More air blowing through the cooler? More oil in the pan? A
slight reduction in viscosity can’t account for the difference. The flow
rate will be essentially the same, as I think your pressure drops confirm;
so-o-o-o what makes the heat rejection rate double?
Same temp, same
everything. The only diff was the oil viscosity. One of the
reasons I tried this was because Bruce T mentioned that thinner oil would
transfer heat better than thick oil. Do you disagree with that?
But it does bring up the question, what is the recommended oil
viscosity? 5W30 seems a bit low.
I'm not sure what the RX-8 uses, but
5W30 is the standard weight in almost every vehicle made now.
Bruce's personal suggestion was 10w40, but Mobile One doesn't come in that
weight. As far as I've seen, the choices for Super Syn are 5W30, 10w30,
and 15w50.
Rusty
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