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I thought I would share the method I used for the Forester oil cooler installation. It may help some especially with the hard pipe at the rear of the block.
Similar to what others have done, from the cooler outlet I used the factory 99078AB330 hose to the factory hard pipe. From the hard pipe to the block M14x1.5 to 1/2 barb fitting I used another 99078AB330 hose.
I read the entire thread and had seen a couple of comments regarding installation of the bypass pipe at the rear of the engine, it was difficult and the lines aren't angled correctly for the BRZ.
Previously, I had a tee in the upper radiator hose for a temp sensor. I thought I would replace the sensor tee with one having a port and run hose from there to the cooler inlet. The tee I used had a 3/8" NPT port and I used a 3/8" NPT to 3/8 barb 90 degree fitting and ran 3/8" heater hose from the barb fitting to the oil cooler. I have a Grimmspeed strut tower bar and attached the 3/8" heater hose to it.
I did have some concerns about the cooling system bleeding properly since that portion is above the bleed port, but everything purged correctly and there have been no issues. One could run the 3/8" hose lower but following the strut tower bar resulted in a shorter route and less chance for abrasion of the hose as it crossed the engine bay.
Previously I had a Blitz sandwich plate installed used for oil temp and just installed it over top of the oil cooler. There was plenty of clearance between the top of the filter and the hood. I actually saw this in an article somewhere so I wasn't concerned.
I also had a Koyorad metal filler neck with a port that I bought almost a year ago and never had installed it. I also installed it during this time and moved the coolant temp sensor there.
Both the Blitz plate and the Koyorad metal filler neck had ports that were 1/8" BSPT and my sensors were 1/8" NPT. To accommodate them I bored the ports out and tapped them to 1/4" NPT. ISSPRO makes a set of nice adapters that are more like bushings so i used one for the water neck. I wasn't aware of them when I did the same on the Blitz plate and used an adapter that doesn't allow as great of probe depth. There is still plenty of probe in the oil flow path so there isn't an issue.
Even though the cooler inlet is fed from the upper radiator hose, the outlet bypasses the thermostat and oil is warmed as soon as heat is available. Oil temps come up faster when idling and my peak oil temp so far has been about 205F. I wasn't pushing it, but the same road would previously give about 220F oil temps.
Total cost was $279.56.
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