Couple hours max 3

With beer breaks.

I went with the AAM R-Line oil cooler for my setup. I just got it installed so dont have many numbers or hard runs on it yet but hopefully it does what it is supposed to do...took a chance on it as I wasnt able to find to much information on it but all the technical specs i've read seem to be legit

Interested to see how this works..

I heavy track my car and am running the Stillen Race series however it appears Stillen has taken that oil cooler off their website recently :(

My race grade Stillen cooler was only 24 row, never had an issue eon the track with heat since its install. Typical race was usually out for 25 of non stop use and never went above normal operating temperatures once the oil cooler was installed

Leaky Stillen Gold Performance 25 row Oil Cooler
 

I purchased a Stillen 25 row oil cooled kit back in June of 2012 along with Gen3 CAI and Exhaust. Z ran great with no more "Limp" mode at the track. I high speed autocross at Blackhawk Farms Racetrack turning 1:29 times and run my Z hard. Last year I saw a few drops of oil under my Z and found the top of the oil cooler was leaning back about 3-4 degrees and the center row had split open just enough to start dripping. I called Stillen thinking there was no way anything could have hit it being behind the front stock grill. Stillen had not heard of any issues and I ordered a replacement core for $129.00 and put it in. I thought I had 4 years out of it so lets just get it fixed and back on the road. Last night, less then 1 1/2 years after the replacement and maybe 3000 street and track miles I see smoke in my mirror and not 15 seconds later my engine oil light comes on. I pull into a gas station 2 miles from my house, shut down the Z and see oil all over my front end. After a short tow back home I see the oil cooler has once again split open around the middle row but this time I could see the 1/4" slit the oil was coming out of. Before I call Stillen I wanted to see if anyone has experienced this before. One time is enough but twice and this time driving at speed (45mph) makes me afraid to just replace it once again. My towing bill would have been much higher if it happened at the track I was just at 2 weeks ago!

I've done a lot of reading about oil coolers and I've never heard of this before. Very strange to say the least.

Wonder if there is any strain on the cooler from either the mounting, or the hoses.

I wonder if there is a braze issue in the cooler mfg process?

I kept everything the same from the first install in 2012 other then replacing the core. All hoses look fine after 5 years and I can put the unit 6" in front of the Z on jack stands to examine so there seems to be enough play/slack in the hoses. I don't see any rubbing on the unit. I'd post some pic's but not sure how. I'm just a "basic" member. I did install the Stillen brake cooler ducks which work great with the Z1 2 piece rotors up front with Carbotech pads. This oil cooler is a major issue I need to solve before next year as I was on my way to park my Z in a garage for the Chicago winter. All 4 bolts were tight when I pulled it out to inspect with nothing I could see causing any issues. It's like the row just expanded with to much pressure but I run the stock oil pump.

Out of complete curosity, have you modified anything else in the oil circulation system? Such as the oil pan, oil pan spacer, use a different sandwich plate then the one provided by Stillen or maybe a larger oil filter?

Oil pan, or a oil pan spacer would have no effect on the cooler.

Make sure you get a Setrab unit to replace this one with. These kind of issues happen with the cheaper coolers, like Mocal.

:iagree: although the Stillen is supposed to have a Setrab core.

I didn't make any mods to the internal oiling system or pan other then the Stillen kit. Z still has stock suspension so a soft ride compared to aftermarket springs. I had springs on my 1979ZX, big difference on track and street. I would like the 34 row Setrab core but not sure if the hoses and connectors are the same. Otherwise I would need to buy the whole new kit for $600.00 and trash the nice hoses and other parts from the Stillen set-up. Just wondering if I'm the only one with this issue. I would gladly pay the difference for the better core after what I've been though. I just don't want to be the guy that shuts down the track for 20 minutes while they lay down oil dry and brush it off next year. I'll call Stillen tomorrow and see what they say.