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Originally Posted by FL 4Motion
/\ that's an issue with pretty much any oil cooler, oem or aftermarket. wouldn't worry about it since the vast majority (85% or so) of the oil gets changed everytime anyway. You could always unmount the cooler once every 3 or 4 oil changes and just "dump" all the oil out just for piece of mind if you want. Just to put into perspective, the GTR has an oil cooler standard and in it's maintenance guidlines, which are very very strict and specific, it never mentions draining the residual oil out of the cooler ever.
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Correct, I generally dump my core about every 2nd or 3rd oil change. The OEM Nissan 300zx TT did not even have a comment about doing this. In comparison to the total volume of the oil system, as long as you change it regularly, the amount of "bad" oil is small.
The 3,000 mile oil change interval is really a standard recommendation. If you change you oil regularly without overheating it or allowing it to break down, then that oil could technically be used for more than 3,000 miles (given certain criteria). With this said, the leftover oil in your oil cooler core and other cavities of your engine will not technically "BAD".
But for piece of mind....I still take the time to dump mine regardless.
Quote:
Originally Posted by XwchriswX
Interesting thought about the dumping the cooler separately... that was the only idea that came to mind, with just loosening the lines and unmounting it, doesn't even seem like it would be that astronomical to just do it all at once. Thanks for the info!
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This is another reason why we choose to add an intermediate fitting both on the sandwhich plate and the oil cooler core side. It is very easyy to simple unscrew the top fittings and drain the core.
Over time however, like any other metal-on-metal contact surface, you will eventually need to replace the fittings. All AN fittings will eventually require replacement due to usage. To help prevent damage to the most expensive components of the system (i.e., core, lines and sandwich plate) these fittings can easily be replaced or allow for disassembly for drainage/maintanence/removal. The Stillen and GTM kits also use a similar setup whereas the Nissan Motorsports Kit does not (this could potentially be bad in the event that you accidentally strip out a fitting while screwing it into the sandwich plate of core).