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Well, I have experience running Royal Purple, Mobil 1, and Castrol Syntec. I ran RP in my '01 Galant from day one. Literally brought it home from the dealer, put it on the lift, and changed the oil to RP. That car had over 99k on it when I traded it in for the Fronty, and the lifters clicked like a SOB. I did run extended intervals of 12k on it, and when the oil came out, it looked like brand new Mobil 1. No thick sludge, not burnt, not black. Just a nice golden color. So I attribute the clicking lifters to piss-poor Mitsubishi designs. Other than the lifters, the car ran like a champ.
My Fronty has had Mobil 1 from day one. Just like my Mitsu, I drove it home and changed the oil out for Mobil 1. No problems so far, and I change it every 5k with either a Nissan or Napa Gold filter. Currently I have about 41k on the odo.
My wife VW requires some crazy VW oil standard, that is only met by Castrol. Unless you wanna pay for Amsoil or some other ridiculously expensive Euro oils. So I use the Syntec 5w-40. Change it every 5k with either a Napa or VW filter. Car has about 96k on it, and runs like a dream.
So with that said, do I think Amsoil has a good product? For the price they better! All I can say is that from personal experience, you can't go wrong with RP, M1, or Syntec. So it's pretty much up to you how much you are willing to fork out for oil.
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2005 Electric Blue LE CC 2WD
Clarion DXZ765MP Head Unit
Planet Audio 6.5" Components
Power Acoustik LT480/2 Amp (Works better than I thought it would!!)
1996 Lanzar DC-10 SVC 4 Ohm Sub
Mid 90's Orion Cobalt 702 Amp (I like the old school!)
Xact Visor Sirius Tuner
Harmon Kardon Drive+Play iPod module
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