I just recently bought Mobile 1 synthetic with the 15,000 mile guarantee. Of course there are stipulations as to what may decrease this life of the oil.

Are we to assume, but the estimation on this article that it won't last a normal driver the 15K miles that it claims?

Granted, I will need to change my filter at least once in the middle(or more if a cheaper filter).

I have gone 5-6K miles each time with the regular M1, and it has been fine as far as I can tell.

Not that it won't last 15K. Mobil will not honor its gaurantee if you change your oil longer than the car manufacturer says to change your oil.

I always change @ 3K miles despite using Mobil 1, AC filter and oil life systems, not worth it otherwise.

I'm the exact same way. And I don't use synthetic!

My theory is that if you simply take care of the engine by changing the oil and not beating on it constantly that it'll run a very long time.

That article seems like a little bit of BS, to me. My car had Mobil one from 35k->110k. If you look at my engine [neglected, oil changes from 110->150k using shitty oil and shitty filter], she'* still real nice, and sludge-less everywhere. Not a single oil leak, nothing. Pistons look like they seal just fine in there. Now, of course the cross-hatch [from honing] is gone.. but what do you expect from a car with 150k? Betcha any money every little bit of CR the car started with, is still there. I don't care what some person [who'* credibility is unknown] says. I go with hard evidence. Graphs, Tables, conclusions, the works. I want to see these tests. And the few I have seen, all say Synthetic is worth it. Remember that oil test on the new Camaro that had Mobil One for like 20k? Well, they had hard evidence of the chemical make-up of the oil. And although I am not a chemist, nor do I know what all that **** is.. he has the evidence to back up his findings.

Once my car is driven more than a few hundred miles on an oil change, Mobil One will go in her. My dad has been working on cars since he was 14 [built his first engine at 15]. Now being 43, if he says something is good, I think he is a trustworthy person, don't you think? He uses Mobil one in each and every vehicle he has. From his $4,000 Suburban, to his $60,000 Escalade. Everything gets Mobil One. 200k on the Suburban. 6.5L Turbo Diesel STILL peels out just like she did new. And no one-wheel wonder.. the sucker has an LSD, stock.

Just my opinion. No amount of convincing will convert me to Dino Juice. And following the scheduled maintenance is mandatory.. going past it is your own risk, but with Mobil One, I wouldn't feel the least bit worried about going 10,000 miles. I'd change the oil by then.. just because my baby deserves that.. probably every 5k.


-justin

Since I do alot of HWY mileage I was changing the oil once a month ( every 5,000 KMS, wich is about 3,000 miles). I then went to synthetic once I thought my new engine was broken in enough. Also since am on the HWY alot, according to my owners manual ( GM) they say I can go 12,000 kms between oil changes with HWY mileage.

So I decided that I would go Mobil 1 synthetic, ( I also use it in the Bonneville). I will 10,000kms between changes on the Malibu. I have checked it at about 5-6,000 kms and someone from one of my accounts was outside. I asked him "how old do you think this oil is" he thought it was brand new, I told him it had 5-6,000 kms on it, he couldn't believe it. Now I know it is all HWY mileage but still, I find a difference, I change my oil every 2 months or 10,000 kms.

I don't think anyone on here said that syntheitc wasn't better than conventional, just that the benefits might not be as incredible as some companies make out.
As for the 15,000-mile synthetics, when you put that many miles on an oil change, the filter becomes the big worry. The oil could certainly handle it, but if your filter goes bad, you're screwed. Best to stick to the 3,000-5,000 miles between oil changes that the car manufacturer recommends.

And I definitely agree that Mobil1 is good stuff, and now that I've gotten one oil-change at the dealer(just to get everything checked), I'll be switching over to Mobil Clean High Mileage.