From what I've seen so far the problem is the fittings on the oil filter adapter. I gotta think how to approach the subject
In the video, I liked where he mentioned how to "eliminate it altogether" by, e.g., replacing the oil filter adapter.
I see the benefit of an oil cooler if one's putting heat in the oil, e.g., by spinning the engine at 3500RPM for long periods of time.
Otherwise, I would be inclined to eliminate it b/c it's a risk with no or little upside benefit.
@Dariusz Salomon, I'm sure I'm not saying anything you haven't already considered for your '99 Tahoe Z71 5.7 Vortec.
FYI, My '98 Suburban 5.7 is original w/o an engine oil cooler.
Notes on replacing the oil filter adapter:
(this was the method of eliminating the lines as mentioned in the video, IIRC)
Removing the original adapter isn't too hard. The situation turns uglier when trying to remove the remains of the gasket that's between the block and the original adapter (assuming one wants to replace it); it's recessed up in a cavity where "creative methods and tools" may be required for removal. It's not something one can scrape off with a putty knife.
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