Hi ive got an aftermarket mocal oil cooler fitted, front mounted, the pipes go over the top n to the oil cooler housing. what i need to know off you guys is, does the thermostat open up when the engine oil is HOT or is it open UNTIL it gets hot then shuts off to cool the oil??? The reason im asking is because ive changed my oil and cooler housing assembly (cos i broke it lol) And when ive come to fill the oil back up (silk PRO S10w/50) i put in at least 3.7ltrs, ran the R up to just above working temp (standstill) then turned the R off til its cool, dipped it and its at perfect level? what im trying to figure out is if the oil cooler has drained or kept the old oil in the system?? IVE been searching for bout 2 weeks now with no look so need some R brain power. We all love a good oil post!! thanks:der: