| Oil cooler on a 583? By all means. I know several of the 620 guys found their oil temp getting a bit extreme at the high revving circuits like Snetterton, but if you set your gearing right you wont be over-reving too much and, if you're the sort of person that's changing oil after every round, then you'll probably be alright, just use a high quality oil. We got the Shell pack last year which made frequent oil changes more manageable on a very tight budget. | 
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