Proposed modification for SUVs

[Buddy]

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[Buddy]

P.S. AMSOIL is NOT expensive. You can buy a one year discount card for $20. It is cheaper to use AMSOIL than to get your oil changed every 5,000 miles at the local Firestone. Get a catalog and check it out yourself.

[MetroMPG]

Originally Posted by Christ

Royal Purple is also very expensive, and very effective... that's gotta say something for efficiency too.

Feel like putting together a critical summary of Royal Purple's efficiency claims? Most of it is "on road" comparisons which we can discount straight off the bat. I had a quick look at one of the two university studies that compared RP to dino oil, and they weren't even comparing the same viscosity in the dyno tests.

[Christ]

Honestly, that post may have come out wrong - I've only used it once, personally, and I never specifically tested it, although I did notice a MPG (not specifically miles per gallon, but more like gallons per trip) improvement in my old Jeep with it, and it SEEMED to have more power/torque as well. (1979 J20 4x4, 360CI V8, 3 speed manual)

I used the engine oil, trans oil, and rear diff oil all at the same time, like they suggest.

I'm sure part of those claims are eaten by the idea that changing all those fluids would give you a gain anyway, but it seemed to work for me. Also, none of those fluids have been changed since then, and the engine oil is still purple-ish, almost 3 years later. (It's a mountain use truck, never sees the road, but it gets BEAT ON... in fact, it's the only 8 cylinder I've redlined religiously, and it never sees 3rd, seldom sees 2nd gear, with 200k and no problems thus far.)

I'm sure their claims are probably somewhat bogus, but I can't dispute that it's a good product. You'd have to test it personally to see what I see.

3 years and oil is still good, that says something to me.