[X25]

Read this!
http://forum.grrrr8.net/showthread.p...l=1#post508830

OK I think I am a victim of computer wizardry. I will just install a REAL oil temp sensor (or get it installed).

I'm pretty close to calling complete BS on the ECM's calculated oil temp value on the LS3....here's why:

• GM info states: "This parameter displays the temperature of the engine oil as calculated by the control module using various sensor inputs", but I haven't yet found any details on exactly how it is calculated or what sensors are involved.
• I first disconnected the so-called 'oil level/temp sensor' on the passenger side of the oil pan and let the car idle for 5 minutes. During that 5 min where this sensor was disconnected, my Aeroforce Interceptor displayed what appeared to be a valid oil temp reading. A few days later, I left the sensor disconnected all day. The 'Check Oil' warning eventually appeared on the dash, and my Interceptor continued to provide a valid oil temp reading, up to my normal 200-ish street operating temperature.
• I then disconnected the Coolant Temp sensor...same results, Oil Temp still had a valid reading on the Interceptor while idling for 5 min (haven't done a full day like this yet). Logic suggests that ECT is somehow involved with oil temp calculation, but how much is anyone's guess. We also know that some people have found that calculated oil temps are lower when using a coolant thermostat that opens at a lower temperature.
• I then disconnected the Oil Pressure sensor...same results, Oil Temp still had a valid reading on the Interceptor while idling for 5 min (haven't done a full day like this yet). As the car sits now, all 3 sensors (oil level, ECT, and EOP) are disconnected, and I'm still seeing oil temps that are apparently reasonable and continue to change with the engine idling. I'm not really sure what other sensors to check. I suspect IAT or AAT, but I'm not going to mess with either of those right now. I'm also starting to suspect that engine run time and or RPM is also a significant part of the calculation.
• Lots of folks with wet sumped LS3's (Camaro/G8/wet sump Vette) have found that calculated oil temperatures are relatively unchanged after oil cooler installation (big coolers, small coolers, Air to Oil, Water to Oil, it doesn't seem to matter much). This just doesn't make any sense at all.
• LS engines with actual temp sensors (e.g. LS1 & LS6) seem to respond much better to oil coolers. This seems normal. Case in point: This CTS-V Oil Cooler How-To, which is a copy of a C5 Z06 (LS6) installation, shows 290's before the cooler install in 70-80 deg ambient temps, and after the cooler install, he saw 232 in ambient of 94 deg F during track events. The size of the cooler in this example is almost identical to the one in the Harrop kit and the one I'm using, and yet, somehow, the LS3 calculated oil temp is almost completely unaffected by an oil cooler?? It just doesn't add up.

I'll update the first post to put a note about this. I will also be installing a real oil temp gauge to test this out, but it might be a while. I am relieved already : )