AMSOIL XL7500 or regular AMSOIL 10W30?

[Flounder]

Which is preferred? Apparently the 7500 can go up to 7500 miles between changes. However, it is cheaper than the regular synthetic. Any reason why this may be? And if you use Amsoil, what do you recommend...

The ST just hit 5000 miles and is in need of its first oil change. Thanks!

 

[glfredrick]

If it were me, I would run the full Amsoil synthetic, and in a 5W grade - not the 10W 30. Your engine calls for light oil and it will be fine.

I have run that in the past with great sucess. I probably would not start running it yet, however. I usually like to get somewhere around 10,000 miles on the clock before switching the motor over to full Amsoil so everything gets properly broken in.

I have also played with the extended change routines with full synth Amsoil. In one vehicle, I changed oil once per year at about 25,000 miles, with a filter change at 12,500 (and a quart added to make up for the filter change). At 245,000 miles, I was still using just one quart of oil per year and the engine ran perfect. (And - it was a Chevette! - not know for longivety)

I am now running synthetics that I pick up locally, but they don't seem to have all the same qualities as the full synth Amsoil that I used to run. I change more regularly now becaue of that.

 

[Flounder]

Thanks for the pointers. I meant 5W, not 10W. Sometimes I look at something and think another...

I'll give it another 5000 to break in, and then do the switch. Now to just find a local Amsoil dealer who can give me a better deal than the internet store.

 

[aldive]

Why not go with their best, Series 2000 Synthetic?

Dead Link Removed

I have gone 20k miles on this oil ( with ezcellent analysis results ).

 

[Flounder]

Al,

Do you use the 0W-30? Or do they make a 5W-30 not listed in their store on their site? The main issue I have is with the temperatures here - goes from 90 or so in the summers to negatives in the winter. Is their 0W-30 up to the task?

Edit: Answered my own question by reading Amsoil's product description, not just looking at the pretty pictures...

If so, at $8 and change a quart = $45 and change for a year of use, which is much cheaper than oil changes every 3-5K. Good deal.

 

[aldive]

I use the 0 w 30 in the Florida heat, I rarely venture into land where it gets below freezing.

My oil analysis results are always excellent.

I change the filter ( either a Mobil 1 or a K & N ) every 7500 miles.

 

[jimbo74]

from what i have heard is that the xl7500 is not a FULL syntheic.. it has just enough sythetic to legally be called a synthetic however it is a blend.... that is why its cheaper than the full synthetics

 

[Mbrooks420]

What generally makes the amsoil fail a test? To many acids from combustion?

 

[glfredrick]

Amsoil 7500 is similar in composition and price to the "synthetic" oils sold mas market. Just enough synthetic to be legally called synthetic. They would be preferred to regular dino oils (and I am running them right now becasue I don't have an Amsoil distributor within reach), but they are not as good overall.

I too ran Amsoil full synthetic for extended oil change intervals with great success. The factors that disqualify the oil are acids - metal particles (almost non-existant with the full synth) and carbons. Checking their web site will fill in the details of their analysis structure. I change the other synth oils that I purchase mass market (like Valvoline, etc.) at about 5000 miles. I would not think of running them for the 20,000 + mile intervals like I did the full synth - plus they do not come with a motor warranty like the full Amsoil does...

I also ran Amsoil in the very cold north. It is PERFECT for that application. On some mornings in central Wisconsin, it might be sitting at -25* with wind chills in the -50* - -75* range. That is cold enough that regular oil turns to peanut butter... Gear oil is thick enough to slice with a knife and have the cut remain intact - diesel fuel solidifies if it is not blended with lighter grades, and of course, your vehicle takes the severe punishment of being without lubrication until those fluids warm to operating temps (not to mention the strain of trying to move them off the spot with the thick gear oils acting as a brake!).

With Amsoil full synth oils in the tranny - engine - and axles, I could drive away my F 150 4x4 (full time - lockers on both ends - built 390, built auto on 38's) at ANY temprature just like it was summer time. It also gave me about 2 MPG difference overall with that truck. With regular dino oil, that 500 HP 390 would not move the truck off the spot without almost stalling...

In my Chevette (used to ferry me 90 miles a day back and forth to my bulk milk truck terminal) I began the use of Amsoil at 12,000 miles (car purchased new). At 12,000, I already had several chipped teeth on the ring gear in the rear axle and the spider gears were making noise. (Icy roads are VERY hard on rear ends - spin - spin - spin - grab blacktop - break...) I figured on just running that rear end until it quit - then grabbing another one from the salvage yard. At 245,000 miles with the Amsoil it was still going... Noisy, but still driving every day, and I was running P225 x 14 tires (huge oversized for a Chevette) on that car for snow clearance.

In my Chevelle with a 355, built, I was able to rev to a 7800 RPM red line on a very consistent basis (like every shift). I did that for years...

I am a definate fan of Amsoil...