So I put the OEM oil cooler back in with the 25 row....with only the 25 row oil cooler I was around ~210 in 60 degree weather and it would increase to ~225 with aggressive driving ...After adding the OEM with the 25 row ...still 60 degree weather ....I’m seeing ~190 and with some aggressive driving ~200 -205. Oil comes up to temp fairly quickly and when it is around 205 it comes back down to 190 ish with in a minute or so. From what I’m seeing summer temps would increase maybe 20-25 more degrees across the board on the hottest days . The factory cooler definitely does assist the A to A cooler and works great in cold weather bringing the oil temp up.

Update- Finally got some 95-100 degree weather and running the factory oil cooler with the 25 row really helped ... aggressive driving holds around 225 and no up and down spikes compared to last summer I was seeing a lot of high spikes with just the A to A cooler ... defenently a worth while using it

This. It's much better as an oil warmer than an oil cooler

That's the only reason it's still on my car.

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Yes it is great in the winter time to warm the oil as well ...it also is very stable in summer time .. looks to knock off 10-15 degrees in summer to .. but since I already had it in the garage it made a free efficient FREE mod lol