Definitely NO additives in our S197's.
M1 is a very good oil. I use it plus an M1 filter in my SUV which is my tow vehicle and I change it at 8,000 mile intervals. I would go 10,000 miles if I didn't tow. My other SUV's were also at 10,000 mile intervals and they all were beyond 150,000 miles and never used any oil. I use Amsoil 0W20 with the Amsoil filter in the Stang and I change that at 8,000 - 10,000 miles. I'd go longer if I did oil analysis but if I'm getting underneath to take a sample I'll just do an oil change.
I've been changing my own oil for over 30 years and also have oil analysis training. People are brainwashed into believing they need to do oil changes much too frequently.
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Rick 07 GT Prem: Alloy, MT, 3.55's, Steeda CAI w/Brenspeed tunes, FRPP Stingers, 275/40/18 Goodyear Eagle F1 A/S on SVT Cobras (OE GT500's), 14" shorty, Wheelskin side scoops & qtr window louvers, A-H rear window louvers, SHR honeycomb blackout panel, Sequentials, Hella Optilux Extreme XY fogs, Silverstars 06 V6: Legend Lime, Pony Package, 14" shorty, Sequentials, Hella Optilux Extreme XY fogs, Silverstars
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