[Ducman]

I have read that it may be common for the external oil cooler thermostat to not open fully. I presume then that the oil lines will still get hot but that circulated volume will be reduced.

How do I confirm proper operation?

My engine with large external radiator style cooler (and fan) still easily gets to 235 on the track and would go right past 250 if I didn't run cool down laps. Even though it's a high hp built engine, it's still only a 2.7, I would think that the single cooler should be able to keep temps lower.

BTW fan is good, fins are not blocked, engine is clean, lines are good (not perfect...but not squashed) and otherwise the engine runs and performs great.

Thanks,
Don