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Hi I'm Kevin it is unlikely that you have high oil pressure more likely that the engine has high crankcase pressure . Very carefully with engine running try to remove oil cap and let me know of the result there shouldn't be and real pressure pushing or pulling against cap
Have you actually had the oil pressure tested by garage ?
There are tools to test oil pressure they need to do this before going any further as they don't yet know if oil pressure is high or if engine is breathing heavy this will give you an answer before chasing another oil leak at least then you will know where you stand before spending Hugh sums of money only to end up with another oil leak