Morris Minor Owners Club

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A tight fit requiring some alterations to the grill's framework but it sits neatly in place, getting plenty of ventilation.

I would suggest that cars using a older type specification oil MAY and only may require a oil cooler when used hard but for those cars using a modern specification oil i.e. semi synthetic/fully synthetic there is no need for a oil cooler as the oil is less likely to breakdown at high temperatures.
I have never found the need for an oil cooler but what I did do on my 998cc Minor engine (and that engine was worked very hard) was to increase the capacity of the sump. That engine was always run on Castrol GTX and I never had any problems even at a constant 70mph on the motorway for several hours at a time.
If your engine is in good condition it is always of benefit to use the best oil you can. It pay dividends in the end.

Is that cooler not blanked by the bumper and number plate? My problem in the past was that I found the pressure falling dangerously low when driving hard - hence the cooler which helped enormously. When rallying I fitted a 'sledge' guard and then the cooler was very essential. In normal running I also lifted the number plate to ensure clear air flow to the front of the sump.. All my Minis had coolers - except my 'autocross/sprint' car where the risk of damage outweighed any advantage - and although the engine was worked extremely hard - it was only in relatively short bursts - even though it was mostly 'double entered' where that was allowed. I do agree that modern 'synthetic' oils are very much better, and will stand much higher temperatures - but I still think the viscosity falls with temperature and the pressure may fall rather too low for comfort... The first Cooper S cars didn't have coolers and the engine failure rate in warranty was so high they very soon fitted a 13 row cooler as standard!

I'm sure it's fine.....