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I agree with the statement of "early to synth"
I run royal purple on my daily... used to do mobile one before... and it was born on its first 3k with oem oil.
the car didnt feel that much different from the mobile one change... but at 20k when i did the royal purple... it felt better all around... even when I turn on the ac it doesnt lag as much as before.
I did synthetic on my OLD s13 sohc ka... supposedly the motor was at 115k-ish (and the second one since the chassis had over 295k).
Car was dirty all together... coolant system clean up...fuel system clean...intake clean...oil clean. after doing all that cleaning I did synthetic for shits and giggles and not a single problem... it got beaten to shit a lot because I was a pizza delivery boy back then.
the only reason it died was because of the alternator.... but that was around the 165k mark so it was expected.
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