Originally Posted by Greg in France

If it is true that oil temps can get to 300 F on a bypass cooling car, this could well cause all sorts of problems, as even synthetics start to degrade well before that. As far as I can see, the one thing we all lack is actual in-use oil temp figures. I have in stock and ready to fit (not easy as it requires the subframe to be dropped to fit the engine to cooler-flexibles steel pipes) a full flow oil cooling system to replace my OEM bypass oil cooling system. I have also managed to acquire a sump plug with a 1/8 npt central tapping for an oil temp gauge sender. This gauge I shall run off the cigar socket as a temporary item as I do not want to ruin my dashboard or the OEM interior.


Before doing the full flow conversion, once summer arrives, I shall take sump oil temp readings during a long fast run on a hot day, including a couple of heat soak stops etc. If the figures are OK (ie below 100 C, 212 F) I shall not do the conversion! If they are higher, I shall, and will then repeat the test with the full flow cooling system and see what the difference is. If anyone has these figures already, please post then.
Greg

Originally Posted by Greg in France

Thanks for this info Jonathan. A bit above water's boiling point is the ideal then; but not too far. 240F is 116 centigrade, so 105 to 115C should be a good general target, do you think?
Greg