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The best one I'm seeing look to be the RRP version that maintains a Banjo bolt on the cooler side and JIC on the other. If you're into modding and you'll already be down there, the real best option would be to upgrade your cooling and install an oil to water cooler.
Wondering if anyone has experience, advice, or their two cents to throw in about low-temp oil cooler 'stats. The stock ones have an opening temp of 194 °F. These aftermarket ones from Rotary Performance open at 165 °F. At $90 a pop (and I'd need two), they're a bit pricey. Can anyone testify to this type of cooling mod?
If the Mocal thermostat is like the OEM thermostat I think the oil is supposed to do a U turn at the thermostat when cold and then flow through to the oil cooler when warm.
There are two different ways of trying to control the temperature, the first is to have it so that the system is constantly flowing, and the second is to use a thermostat which will try to keep the oil at optimum temperature. On race cars and special builds, a remote oil filter housing is sometimes a useful addition to your oil system.
The fix is as simple as unscrewing the original oil thermostat and installing a replacement. Our preference is to install a 165 degree replacement. This is a 40 degree reduction in opening temperature. An important note, automatic transmission RX-8’s have one cooler and one thermostat.
Mocal inline oil thermostats are fitted into oil lines between the engine and the oil cooler. The oil thermostat diverts oil from the cooler until the oil reaches 80°C. Mocal oil sandwich plate with built in thermostat.
Any oil cooler is really fine. The OEM ones (on a 2 cooler car) are way oversized, so the thermostats are closed a lot. The single cooler cars do run with higher oil temperatures, but they're not out of control. The pressure drop from the pump to the bearings is reduced just because of the simpler path.
