Quote:
Originally Posted by ASaltyDog
Manny, there's actually a big difference between the two. Problem is as you noted is this 15k oil change idea is a bust.
Under no circustances should you drag around oil for 15k miles in an MB. You have GOT to get the dirt out of that motor, and the oil change is the only good way to do it short of dismanteling and physical cleanout.
On big sumps like the 12's and big 8's the oil will hold a good amount of dirt in solution - most of which has bypassed the filter. But it's got to come out of the motor sooner rather than later, IMHO somewhere around 4-5k miles.
Sludge, intake clogs, valve guide clogging, EGR clogging etc ALL have to do with natural dirt and combustion mess in the motor that can't get out.
True, the oil itself is remarkable and will not break down prior to 15k miles. But the dirt it carries around will wreak havoc with your motor, regardless of size, compression etc
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That, sir, is some good thinkin'! 
As for brand, there is Mobil 1, weight as recommended by MB. I use Elf brand oil which is also an excellent synthetic.
As for the whole switching from dino to synthetic argument, I went from dino in my 1989 300E to full synthetic without the slightest of problems. I had 198,000 Kms on the clock when I started using synthetic, and it made it to over 333,000 Kms, all original motor. Car still being driven today and I'm guessing it'll do 500,000 without issue. 
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Chris
2007 E550 4Matic - 61,000 Km - Iridium Silver, black leather, Sport package, Premium 2 package
2007 GL450 4Matic - 62,000 Km - Obsidian Black Metallic, black leather, all options
1998 E430 - sold
1989 300E - 333,000 Km - sold
1977 280E - sold
1971 250 - retired
"And a frign hat. They gave me a hat at the annual benefits meeting. I said. how does this benefit me. I dont have anything from the company.. So they gave me a hat." - TheDon
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