Could the oil leak have caused some damage to the alternator?
I've seen electrical gremlins manifest themselves through a voltage spike coming from a faulty alternator - a generic OBD reader with the ability to track voltage should be able to map what the alternator is doing.
Plug it in and take the car for a good drive and review the results.
A good clean up of heavy pos and neg terminals would also be a cheap fix if it cures the problem.
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Daily drive:
2016 Infiniti QX70.....a car that's even more complicated than my last Infiniti FX to modify 
Current 'Project':
VW Crafter CR50 4 berth camper van
Previous 'Projects':
2006 Subaru Legacy Spec 'B' 3.0R,
1994 Ex-MOD Land Rover Defender, now "civilianised".
2000 Audi S8 FL
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