Oil leaks don't spontaneously show up. If you never touch the motor where oil is pumped through it, you'll never ever leak. Granted, you need to get your oil changed every X KMs so there's always a chance (and it has happened but is extremely rare). If you do happen to lose the motor shortly after an oil change, tow the car to Mazda, give them the keys to your car and have them replace the motor. It was their mistake and they should fix it (assuming Mazda changed your oil).
If you swap in a bigger turbo, part of your due diligence is checking for leaks after the turbo was installed. You look from the top, crawl under, rev the engine, check again. Check again in a few days. If it isn't leaking now, it won't leak later.
Pressure IS related to temperature. I have monitored oil pressure vs. coolant temperature many a time and notice a 5-10PSI drop in oil pressure as coolant temperatures surapass 200*F in stop and go traffic. You can expect the same effect if you're tracking the car. At the end of the day, it is not something to be worried about. The only time things become an issue is if oil pressure dips below 20PSI and at that point, it'll be 0 within a few seconds as there is something seriously wrong with the motor.





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