is there a difference in these three oils Mobil1 Royal purple amsoil . Is one better then the other in real facts. I started out using Mobil1 and then tried Royal purple. Same gas mileage on both.

 

Amsoil and Mobil 1 use different formulas, never used Royal Pruple myself. I've used both Amsoil and Mobil 1 and found virtually no difference in performance. There IS a difference in price, though. Amsoil is marketed thru home based vendors much like Amway and costs more than Mobil 1. I know, I'm a FORMER Amsoil dealer. Save your $$ and get the same performance with Mobil 1.

Dusty

 

thanks for that info Dusty! Does anyone know if there is a difference when you start using synthetic? I know if the vehicle is old not to or the seals will start to leak, but should you start at first oil change or a certain amount of miles?

 

I changed to Mobil 1 at 300 miles. Drain pan had some minor metal shavings.

 

I SWITCHED TO AMZOIL AFTER 6000 MILES...THE DEALER GAVE ME A FREE OIL CHANGE AFTER 3000 MILES..I WANTED TO BE SURE MY RINGS WERE SEATED BEFORE THE SWITCH..I STARTED USING AMZOIL AFTER I BOUGHT A NEW POLISHED BIG INCH MOTOR FOR MY HARLEY..THE ENGINE MANUFACTURER RECOMMENDED AMZOIL AFTER A CAREFUL BREAK IN WITH REGULAR OIL..MOTOR WAS WORTH 9 G'S SO I TOOK THEIR ADVICE AND HAVE BEEN PROBLEM FREE FOR 5 YEARS ALREADY..AS FAR AS AMZOIL GOES I SIGNED ON AS A PREFFERED CUSTOMER AND YOU GET A NICE DISCOUNT..I USE SYNTHETICS IN MY SILVERADO,MAGNUM AND H-D...GO ON LINE..CLICK..CLICK..A DAY OR TWO LATER AND UPS DROPS IT AT MY BACK DOOR....JUST MY 2 CENTS...WHATEVER YOU USE IT WILL BE BETTER THAN REGULAR OIL AS THESE HEMI'S RUN HOT....

 

Royal Purple is great 12,000 between changes. 6k between filters. You can get a 20 qt jug for around $100. Use NAPA gold filters for this oil. I use 10w 30 in summer 5w 20 in winter.