Hi all
My experience is that oil coolers are only really needed if you are using a lot of revs for a sustained period …. So some fast road, long motorway driving at upwards of 4000 rpm, rallying, racing etc where you’re running the oil hot to its limits. Otherwise, why would you ? I’m sure many who use their cars gently don’t need them.
Adding to the above, I’ve learnt that running oil temperatures that are too cool actually starves the rear of the engine of oil … with serious consequences, so again use in cold temperatures ie winter driving means No Cooler! The optimal engine oil t