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  #1  
Old 12-23-2007, 11:21 PM
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first OCI when switching to synthetic?

So I'm switching from Valvoline blue 15W40 to Mobil 1 5w40.
Any thoughts of when to change the oil the first time through? I figure since there is almost a quart of old gunk in there I may want to shoot for a shorter interval than I normally would consider with the synthetic. Or is contamination not an issue with the mobile 1?

-nB
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  #2  
Old 12-23-2007, 11:24 PM
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You shouldn't have a problem going over to synthetic, the filter is going to caught everything that might give you problems. Just keep using synthetic and your motor should be fine.

Good luck
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  #3  
Old 12-23-2007, 11:27 PM
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I never did anything different, it takes a long time to clean.

You need to run it for 20k-40k miles to really clean out the engine.
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  #4  
Old 12-24-2007, 01:08 AM
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If your engine has a lot of gunk, just change the oil filter after a few thousand miles. The oil will last longer, and you'll have the peace of mind of not clogging the filter.
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  #5  
Old 12-24-2007, 01:19 AM
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Quote:
Originally Posted by Hatterasguy View Post
I never did anything different, it takes a long time to clean.

You need to run it for 20k-40k miles to really clean out the engine.
I trust that what hattie is saying is that you should use normal OCI for 20 - 30Kmiles... 3 to 5K on each oil change... with new filters each time, and after the 20 or so K miles, you will be getting all the benefits of full synthetic.
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  #6  
Old 12-24-2007, 02:23 AM
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I agree. Change the synthetic at the normal dino interval for the first two or three times, then run extended drain intervals.
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  #7  
Old 12-24-2007, 11:42 AM
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Quote:
Originally Posted by networkboy View Post
So I'm switching from Valvoline blue 15W40 to Mobil 1 5w40.
Any thoughts of when to change the oil the first time through? I figure since there is almost a quart of old gunk in there I may want to shoot for a shorter interval than I normally would consider with the synthetic. Or is contamination not an issue with the mobile 1?

-nB
I'd first drop the oil pan to see if there's any gunk in there. That, and the valve cover. Take a look and see if there's any gunk, before assuming there is. I've never found any gunk in any of my engines. Up to 305K on one.......none.
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  #8  
Old 12-24-2007, 11:45 AM
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Alot of work for something thats completely unnecessary. Just switch over and have the peace of mind that it will be cleaner than before.
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  #9  
Old 12-24-2007, 12:04 PM
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Well I've already followed SRJ's advice (because of the requisite valve adjustments) though I have no intention of dropping the pan, and it is dirty. Not dirty like those evil sludge pictures mind you, just normal dirty. I plan on changing the filter after 1K miles and topping off the oil, because I think most of the big chunks will have broken off by then.
-nB
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'83 300D Turbo
Current: ???K mi - 19.2mpg -> 17.4mpg -> 22.9mpg ---> ODO Died
bought at: 233.8K mi - 10MPG For $1.00
3.5 cylinders work: 320 320 100 340 280
Got insurance? FarmersReallySucks.Com
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  #10  
Old 12-24-2007, 12:11 PM
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According to the OP, "there is almost a quart of gunk in there," it would be a shame to just leave it in there.

Gunk is a grave danger leading to engine failure, and won't get cleaned out by OCIs. An ounce of maintenance is worth a few thousand dollars of cure.
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  #11  
Old 12-24-2007, 12:12 PM
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Quote:
Originally Posted by networkboy View Post
Well I've already followed SRJ's advice (because of the requisite valve adjustments) though I have no intention of dropping the pan, and it is dirty. Not dirty like those evil sludge pictures mind you, just normal dirty. I plan on changing the filter after 1K miles and topping off the oil, because I think most of the big chunks will have broken off by then.
-nB
Good man..........you can never be too careful with maintenance.
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  #12  
Old 12-24-2007, 03:37 PM
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Why would you drop the oil pan to look? Do you have any idea how hard that is on some of these? Just open up the fill cap and take a look inside with a flash light. The valve train is going to sludge up first if the PO used super extended intervials.
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