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post #1 of 17 Old 04-19-2010, 11:17 AM Thread Starter
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Synthetic Oil?

Can anyone tell me when it's a good time to change to synthetic oil? I have 2800 miles on my truck and want to run synthetic in it, but I'm being told from the dealership that I shouldn't run it until the truck turns 10K miles. Is there any truth to this?

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post #2 of 17 Old 04-19-2010, 02:47 PM
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I changed to full synthetic Shell Rotella T 5w-40 at 200 miles.


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post #3 of 17 Old 04-19-2010, 07:30 PM
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I went to 5w40 syn. rotella my first change at 5k miles and change it every
7k now.
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post #4 of 17 Old 04-19-2010, 07:52 PM
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I may get some flack here for this but, isn't running synthetic and still maintaining recommended oil change intervals a waste of money? I recently read this article by Blackstone Labs pretty interesting stuff on comparing brand and types of oil http://www.blackstone-labs.com/newsletters.php?ID=63. It doesn't specifically talk about synthetics, but I thought the point of running a synthetic was to extend your intervals.

To the OP: To be on the safe side (warranty wise), I'd wait to switch till they tell you, but if you run the recommended weight oil, they can't really argue with you.

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post #5 of 17 Old 04-19-2010, 08:14 PM
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I switched to Rotella 5W40 Synthetic at 3500 km. The old school way was to wait for higher mileage before making the switch to synthetic but that's not the case for engines of today. Myths About Synthetic Motor Oils

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post #6 of 17 Old 04-19-2010, 08:19 PM
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When i used dino oil in the other strokes i had i did 5k changes as they called for but the book calls for 10k changes on the 6.4 under normal conditions and that is with ford semi syn. oil seems like to long to me so i run the full syn. and go out to 7k i probably could go 10k and be fine but as most here will say it's cheap insurance for a 60k vehicle. sooner or later i will drain some at the time of a 7k change and sent it to blackstone that may change my routine based on what it says but until then 7k.
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post #7 of 17 Old 04-19-2010, 08:28 PM
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Amsoil.I change my oil once a year or every 10,000km

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Last edited by dusted4eva; 04-19-2010 at 08:37 PM. Reason: Typo
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post #8 of 17 Old 04-19-2010, 10:05 PM
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Synthetic oil is still good old black stuff from the dinosaurs. The difference is that its refined to higher levels and the best chemical properties are combined to make a single compound containing only the most critical components for that specific market.

Basically if regular oil contained Aa, Bb, Cc and Dd chemical properties, the refiner would extract and separate all the Aa and all the Bb from all the Cc and Dd parts. If the Aa parts provide the best friction protection and the Dd parts provide longer oil viscosity then they would only combine those two parts to get the best friction and viscosity oil.

If there is any reason to use a regular oil for a specified amount of time it would be to properly seat all of the moving parts such as bearings, rings, lifters etc. This would provide optimum sealing of the surfaces to provide the greatest power. It might be old school thinking but that's how I was raised and I have followed those rules with great success. There is no doubt that synthetics provide greater benefits beyond standard oil but at what cost? For every pro there is a con...just depends on who you ask.
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post #9 of 17 Old 04-20-2010, 06:19 PM
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Dusted4eva: I couldn't imagine wasting that much money on oil. It's more than triple the cost to run Amsoil (probably more in Canada), and you're still throwing it out at 6500 miles. I can see the point of running Amsoil in Differentials, Transfer Cases and Transmissions but not in my engine. If you're gonna spend that much money why not get it tested before you change it and see if it needs to be changed.

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post #10 of 17 Old 04-20-2010, 08:55 PM
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Motorcraft 15w-40 diesel oil costs $15.99 for 5 quarts or $3.20 a quart or $47.97 for 15 quarts. Shell Rotella T 5w-40 full synthetic costs $19.50 for 4 quarts or $4.88 a quart or $73.20 for 15 quarts. The difference is only $25.23 for an oil change. Is that really that much more to spend for a higher quality oil? I only put about 6500 miles per year on my truck, so the difference is definitely worth it to me because of the length of time that the oil stays in the engine.


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