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Old 04-04-2013, 10:35 AM   #31
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IMHO, the filter has more to do with the time between oil changes than the oil itself.

I have yet to change the oil in my Jeep, but I was changing it in my Mustangs at 6k miles. That was mostly due to the filters and running in dusty environments. If you use the cheapy filters like Fram and the Autozone house brand, I wouldn't go much past 3k due to the paper element. I don't even want to get into the drainback valve construction in these (made of cardboard in many cases).

I switched to Wix filters (may still not be the best, but far better than the cheapies) when I switched to full synthetic Mobil 1. I see a lot of people singing the praises of Amsoil, but always wonder if it is REALLY that good. I don't know anyone personally that has used it. I run Royal Purple in my diffs (need to change to it in the Jeep soon) and transmissions, but haven't used it in the engine yet. I may switch to it on my first oil change.
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Old 04-04-2013, 11:20 AM   #32
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I will bet that Jeep just didn't want to add extra costs by running with full synt. They want it to also be affordable for all . My 2004 Excursion came with a compromise it ran synthetic blend 0W20 says change every 7500 mi

83 Renagade / 88 Cherokee / 91 Grandwagoneer / 92 Sahara(sold) / 97 Sahara(sons now) / 98 Sport (sold)/ 11 JKUR (RIP) / 05 unlimited (sold) / 2014 JKUS
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Old 04-04-2013, 12:11 PM   #33
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just a note; there is NO manufacturer that sends their products out with BREAK-IN oil! the chance of some one NOT changing their oil ups the liability issue too high. there are several car manufacturers who send their products out with synthetics and high mileage recommendations. some of AMSOIL has some with 25K or one year intervals, MOBIL 1 has some with 15K or one year intervals, notice the ONE YEAR part.
I have used AMSOIL since 1974, Wife DEMANDS it in her cars/jeeps. I usually go the one year intervals, never a problem.
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Old 04-05-2013, 06:40 PM   #34
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Originally Posted by dieselgiant View Post
Did you do an oil analysis and saw imperical data that the synthetic oil was "done" at 3500 miles? Just looking at it wont cut it a lab analysis is the ONLY way to tell if its done. I know of NO situation where conventional oil out performs synthic except in 2 areas. 1) Initial cost at install is cheaper, 2) wear rates over time are higher.
You missed the fact that I was talking about two different vehicles.

On my car, which I raced very often, lab analysis shows severe breakdown after only about 3500 miles or about 1/2 a season of racing.

My truck, which is basically a highway driven street vehicle, only got conventional and it would easily last 7500 miles.

Not once did I ever mention conventional oil would outlast a synthetic. Yes, I do oil analysis on ALL of my oil in ALL of my vehicles.
Originally Posted by Ogandactavis View Post
Is mobil 1 oil any good?
Depends on the weight. From my testing, the oil itself is pretty good but the weights seem to be on the lower side of the scale for my taste.
Originally Posted by HOOCBB View Post
IMHO, the filter has more to do with the time between oil changes than the oil itself.
Yes, often people over look the filter. The oil may last 10k, but can the filter? I change my filter at 3000-5000 independent of the oil. Store clerks look at me odd when I go in to buy supplies for oil changes. I buy a case of filters and one jug of oil!

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