Guys, you can still peg a Z at 280F with a 19 row cooler on a hot day. It all depends on how you drive. If you're conservative on track and typically upshift early (don't keep the revs at 5k+), you won't have temp issues. If you're aggressive and downshift into second in corners and really dog it, you'll still spike your temps with a 19 row cooler. A 25 row does better, but some guys just go the 34 row route (best for F/I). If you have a 19row on a 100F day and only see 200F oil temps, you're driving very conservatively.
The beauty of the oil cooler is that your temps come down much faster when you ease off the throttle for a short period. You can have 240F temps and one easy lap will have you back at your thermostat plate temp.
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2013 Cadillac V-Wagon, RIP Z
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