Hello Scotty, Im s proud owner of a 1998 Mercury Grand Marquis Ls 2v v8 4.6 it has 105k I am the second owner of the vehicle it has all of its service records & maintenance services & has been babied…

Concededsleet08

Hello Scotty, Im s proud owner of a 1998 Mercury Grand Marquis Ls 2v v8 4.6 it has 105k

I am the second owner of the vehicle it has all of its service records & maintenance services & has been babied its entire life. &

I literally do the same & i do my own preventive maintenance work. I wanna use Royal purple 5w30

(I use 5w30 supertech in my vehicle) ( i changed my oil every 3k-4k miles + in a daily driver/work (work is 15mins away roughly 3-4miles from where i live.) (vehicle i barely Put a 1k-2k in possibly 2-3 months )

but I've been told its too expensive & that its a waste of money & it will ruin my entire engine due to high mileage, yes i understand that they make high mileage royal purple. I have been given alot of negative feedback but when i go out & find my own research theres a guy on YouTube called tenza Motorsports that tested royal purple on 2 different engines & shows amazing results... but that is all different experiences. even my dad said that if i use royal purple it will ruin my engine gaskets, & cause leaks. due possible dirt inside the engine which makes no sense to me if my vehicle was Maintenance by a dealership its entire life upon me owning it..

what should I do?