Quote:
Originally Posted by SoCal 370Z
The core lines are at the top, and there is no additional drain tap (unless you have a custom core fabricated) so there is no draining of the oil cooler's residual oil.
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Honestly I think it'd be OK to tap one of the bottom corners with a short NPT plug so you could easily drain during oil changes. You just wouldn't want to go too deep and you'd have to be very vigilant to make sure no metal shavings get in the cooler.