I recently, last fall, switched from the modshack fittings down cooler to Z1s fitting up 34 row. I'm not going to worry about the tiny bit that gets left in between oil changes. minus the lines, its probably 8% of the oil in the system, and I really don't think its that big a deal to mix slightly dirty 8% with clean 92%.
But then again, I'm just waiting to blow the engine to do an LS swap.
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NISSAN: 75 280Z / 86 300ZX GLL /87 Sentra SE / 03 350Z / 23 Z
Porsche: 93 968 / 23 Macan GTS / 93 968
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