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Old 11-25-2003, 08:45 AM   #43
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Oil Change Interval

With the Duramax, after reading about how the on-board computer determines oil change intervals, I plan to go along with the computer. It's more a matter of convenience than economy as my dealer is 35 miles away. Prior to my initial change at 6,000 miles I was still having problems seeing the oil on the dipstick. Subsequently I have to make sure the light is just right because the oil is so clear it hardly shows at all. I always thought diesels were dirty! I haven't done any serious towing yet.
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Old 11-25-2003, 08:54 AM   #44
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Re: Oil Change Interval

Quote:
Originally posted by Cracker
Prior to my initial change at 6,000 miles I was still having problems seeing the oil on the dipstick. Subsequently I have to make sure the light is just right because the oil is so clear it hardly shows at all. I always thought diesels were dirty! I haven't done any serious towing yet.
I have the same problem seeing the oil on the dipstick.

This is a revelation to me because with my previous diesels (Mercedes and VW), the oil would be totally opaque with carbon black within just a few miles of an oil change. Changing oil was a terribly dirty experience back then. Diesels have come a long way since the 1960s.

Like you, I intend to use the computer to determine my oil changes, just as I do on my Buick. I ordinarily change at about 33% oil life left. The computer will adjust for towing loads.
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Old 11-25-2003, 02:30 PM   #45
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Diesels are not as expensive as I had thought - Ford's website shows the diesel upgrade for an F250 at ~$5100. The Kelly Blue Book site show the private party price spread between diesel and gas on a three year old F250 at ~$5,750. Although you pay a lot more going in, you get it back at the end.

At 20,000 miles/year if you can get 19 mpg instead of 14 mpg, assuming diesel fuel sells for 10% less than gas (this varies) you would save

Gas : 20,000 miles / 14 mpg = 1428 gallons * $1.60 = $2285
Diesel: 20,000 miles / 19 mpg = 1052 gallons * $1.45 = $1525

Save $760/year, although the additional cost of money for $5000 @5% erases about $250/year of this savings.
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