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[John Monnin]

I noticed that you were running the oil coolers in parallel. It would be interesting if you tried runned them in parallel and in series to see which is more efficent.

Running the oil coolers in parallel, If one cooler has more restricted path, like having to go to passenger side of the vehicle, the oil might want to only go through one side.

Running the oil coolers in series might be more restrictive to flow.

At work we somtimes install auxilliary heaters in trucks. The stardard method is to use a bunch of y-fittings and plumb them in parallel with the main dash heater, our testing showed this got the most heat from the water. Some customers insist on running the heaters in series becasue their real world testing showed that series was more effictive. We never took the time to figure out why, we just give the customer what they want. The theory we have is that with a parallel routing that if the hoses are not routed carefully most of the water will flow through only one heater.