Originally posted by Thuundar80530: Change interval for high end synthetics is NOT 5k miles.
And similarly, change intervals for conventional oils are NOT 3k miles.
Quote: 25k miles, with warranty. Change the filter every 12.5k miles, again warranty.
That is if you buy into Amsoils claims of 25k changes. At least one of the Big 3 has no confidence in there claims based on their testing.
Quote: Price per quart is around $6. Filter for a Contour is less than $10. Let's NOT use the same filter for dino oil. Synthetics require better filters. And by high end, I'm talking synthetics formulated to run more than 7.5k miles (Mobil 1).
You never specified so I used Fords recommendation of Mobile 1 in SVTs as a comparison. I decided on 3 and 5k intervals because both are ridiculously low. If I had any idea that you were referring to Amsoil, I would have increased the interval.
Quote: Who's manipulating numbers (?)
Before this post, it appeared as you were because you didn't establish any parameters for your original numbers.
Quote: And my Contour uses 6 quarts of oil..not 5.
Congratulations, mine used just about the same. My Escort, Biscayne and Ranger use less(!). Now let's get back on topic.
Quote: We'll use your outlandish 40k per year (very high number).
I deeply apologize for my long commute to work. Perhaps, I should have picked a less outlandish place to live, but I like it and I think I will stay.
I will just get rid of the example as we can manipulate the numbers to give us whatever result we want.
Quote:
What's your problem Jack?
I have no problem, George. I was just trying to make a point that few if any of us NEEDS to use synthetic as it hasn't been proven to extend engine life. Most synthetics cost more to use. If Amsoil does get to the point that its additives survive the 25k mile duration, I may consider using it if it saved me money. But until then, I would feel safer using conventionals with a 5k interval.
Nice discussing this with you, Gilbert.
btw, nice guess at my name with "Jack", I have a cousin named Jack so you were damn close! Did I come close with Bill, Gilbert or George?
Dave
Last edited by dnewma04; 01/08/0307:21 PM.
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