ZR-1 Net Registry Forums - View Single Post - I discovered how to easily drain the oil cooler! (on my 91' at least)

A26B · 10-12-2013

If I recall correctly, the oil cooler is not in the full flow path until the oil temp thermostat in the oil filter adapter opens. Prior to opening, the oil flow to/through the oil cooler is minimal, so that when the oil t-stat does open, the cooler is fully charged.

That is why you will not see any abnormal pressure lag after an oil change with an empty oil cooler, as mentioned by the OP.

10-12-2013	#14
A26B Join Date: Dec 2003 Location: Arcadia, OK Posts: 3,401	Re: I discovered how to easily drain the oil cooler! (on my 91' at least) If I recall correctly, the oil cooler is not in the full flow path until the oil temp thermostat in the oil filter adapter opens. Prior to opening, the oil flow to/through the oil cooler is minimal, so that when the oil t-stat does open, the cooler is fully charged. That is why you will not see any abnormal pressure lag after an oil change with an empty oil cooler, as mentioned by the OP. __________________ Jerry Downey JERRYS LT5 GASKETS & PARTS http://www.jerrysgaskets.com 1994 *ZR-1*, Black/Black, Lingenfelter Aerobody, 416cu in, 3.91 gears, coil-over susp, Brembo brakes, etc. 2016 Black-Red, 3LT-Z51 Auto 8-speed.