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  #1  
Old 02-13-2010, 12:50 AM
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CHADDER03 CHADDER03 is offline
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I recently had my oil changed and I know my truck is suppose to had 5w20 in it. I decided to change to synthetic and my mechanic put in 10w30. He said that the 5w20 is to thin and wouldn't protect enough, I put a lot of trust in my mechanic and I'm confidant in his work and knowledge... But I'm just wondering what someone else's take on this would be. Bad/good idea? gains/losses?etc
Thanks in advance for the input

Last edited by CHADDER03; 02-13-2010 at 01:53 AM.
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Old 02-13-2010, 01:32 AM
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The issue with 10W30 is that if you have the MDS system, the heavier oil doesn't allow a clean shift in and out since it's an oil pressure activated roller arm. I highly recommend you tell your mechanic he's an idiot and put 5W20 in. The 5W20 is the recommended weight for a reason.
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Old 02-13-2010, 01:57 AM
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Thanks for the advise, should I change it out now or will it be fine to wait till my next change? also i heard once you change to syn you cant change back and that it is good to stick with the same brand as well? not that i want to change back to conventional oil just curious
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Old 02-13-2010, 02:04 AM
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It's a personal choice, but I'd change soon since I want my engine running at it's peak.

Only difference in brands is quality, so synthetics like Mobil 1 vs Amsoil/Royal Purple is a choice. I run full Amsoil in my HEMI and endorse it wholeheartedly. You can switch between synthetic and dino with no issues with the modern gaskets. The old issues were with the gaskets that would swell/shrink and then leak.
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Old 02-13-2010, 02:06 AM
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Quote:
Originally Posted by CHADDER03 View Post
Thanks for the advise, should I change it out now or will it be fine to wait till my next change? also i heard once you change to syn you cant change back and that it is good to stick with the same brand as well? not that i want to change back to conventional oil just curious
That's not entirely true. Most people don't recommend switching back and forth willy nilly but I've yet to hear and empirical evidence that switching does anything bad. I've heard plenty of hearsay, but no proper scientific data to that effect.

The problem with most "thin" oil is that they continue to thin more as they break down and end up acting like the lower viscosity number all through the thermal range. True full synthetics (read as amsoil and mobile 1) are extreamly resistant to this breakdown (search zonestar's post on this if you want the full explaination). These oils will protect, as the manufacturer recommended, for long than dino oils with viscosity improvers.

Bottom line, use the 5W20, but use a good one.
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Old 02-13-2010, 02:12 AM
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DOes this so-called mechanic really believe that Chrysler hasn't tested their engines on 5W-20? You should take it back to them as soon as you get the chance and make then put in 5W-20.
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Old 02-13-2010, 08:37 AM
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You should go back to your mechanic with the paper work showing you need 5-20 oil and ask him to change it for you, if he will not change it, speak to his/her boss, if still nothing tell them you are going to report the garage to the Better Business Bureau. If you have to make the report to BBB, I would find a new mechanic as they may be a little pissed.
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Old 02-13-2010, 10:07 AM
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The newer trucks actually have the software to detect oil visocosity useing the oil temperature and oil pressure sensor. It could actually set a check engine light if the viscosity get's too wild.
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Old 02-13-2010, 01:18 PM
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engines with MDS have to have the recommended oil because thats what its tuned and built for. on the heavy side(10w30) it will mess with the MDS because it cannot flow properly and making it hesitant to kicking in... therefore lowering your gas mileage. however a thinner oil 0w30(20 if you can find it) 5w20 so on so forth will not affect it as much seeing as how its thin and will flow threw the oil ports just the same. if anything activating it sooner... this being said, with MDS you need to not go too far in any direction or it will make MDS useless because it will turn on and off at the undesired times or at random. that mech should change it out at no cost because one... hes an idiot and does not know it will mess with the MDS and two it was his fault for not researching the motor before working on it. manufacturers recommend oils for a reason.
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Old 02-13-2010, 02:03 PM
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Well, if the (independent) mechanic 'discussed' this with you prior to changing the oil, and you agreed, he doesnt 'owe' you anything, as you consented.

If he is a dealer based mech, you may have a little more lee-way, as he is technically not following the mfg's recomendations

0W-30 is no thinner than 10W-30 'at normal operating temperature', only when 'cold' is it thinner

Use a good quality Dino 5W/20, changed as outlined in the manual, and you should never encounter any oil-related issues.

If you want to run synthetics, that's fine too. Not required, but with a 6 month maximum time interval between changes as specified in my 09 owners manual, I'm not sure that even Dino will be 'getting tired' by then.

Hauling, towing, and hot conditions shorten the life of oil, and Synthetics handle those conditions better than Dino.

Dirty and 'modified engine' conditions ({many} CAI's, Programmer's, etc) contaminate your oil moreso than an all OEM engine, and you oils service life, be it Dino or synthetic, will be shortened.

Your mileage may vary.

Last edited by HoustonHemi; 02-13-2010 at 02:10 PM.
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