Introducing the Z1 Motorsports 370Z Oil Cooler Kit *Customizable*

Dustin@Z1

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.

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).