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    Thread: Oil Question (5w30 versus 5w40)

    1. 05-07-2009 10:28 PM #1
      So I changed my oil about 2000 miles ago and just realized that I didn't put in a 502 approved oil. I used castrol syntec 5w30 because it came in a 5 quart jug. The owners manual says to use a 5w40 or 5w30 if 5w40 isn't available. Walamart only had 5w30 for castrol syntec so I went with it.
      Do you think its necessary for me to change this oil to 5w40 immediately or am I ok to go another 3,000 miles and change it out at 5,000 miles. My car currently has 23,000 miles and is a 03 1.8T GTI.
      On a side note I've recently developed a clicking noise at idle only once the engine is warm. Could this be related to the lower viscosity of the 5w30 oil??. I think the culprit is the timing belt tensioner, but maybe it could be a lifter (?). Any chance this oil could have caused it? (I prefilled the filter before I put it on so the engine wouldn't be dry at first start). I used an OEM Mann Filter.

      Modified by DrTacoElf2 at 7:30 PM 5-7-2009

    2. Member pturner67's Avatar
      Join Date
      Dec 26th, 2002
      2010 Infiniti G37x
      05-08-2009 11:46 AM #2
      dunno about the clicking noise
      M1 5w30 is not 502 approved but you should be fine in the 1.8t engine...your owners manual says 5w40 or 5w30 if 5w40 isn't available
      2010 Infiniti G37x sedan, 50% tint, 19" M45 sport wheels, Hotchkis sways

    3. 05-08-2009 11:54 AM #3
      5w-30 has the same viscosity as 5w40. The difference is the 5w40 can withstand a higher temp without losing its viscosity than 5w30...which is something I take seriously on a FI car. These motors are HOT.
      It'll be ok, but you probably won't be able to go as long on 5w30 as 5w40.
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    4. 05-15-2009 12:24 PM #4
      Casrtol Syntec 5W-30 doesn't eeven meet VW specs....get that crap outta there!

    5. 05-15-2009 11:58 PM #5
      Ran it for about 2000 miles. Changed to castrol syntec 5w-40 and a new OEM filter today.

    6. 05-16-2009 12:52 AM #6
      Quote, originally posted by Buschwick »
      5w-30 has the same viscosity as 5w40. The difference is the 5w40 can withstand a higher temp without losing its viscosity than 5w30

      These two oils DO NOT have the same viscosity... their cold viscosity is the same, hence the 5, however their operating temp viscosity IS NOT the same, as the 5w-30 has the viscosity of a 30 weight when at operating temps, and a 5w-40 has an operating viscosity of a 40 weight when at op. temps...
      The -0 or 40 is representative of the operating temp. viscosity, which is due to the addition of polymers to the oils, which are what change the viscosity due to the temp of the oil.
      Is it a big deal... not really, otherwise VW wouldn't have said it's acceptable when 5w-40 isn't avail. but for the best protection and longevity stick to a VW approved 5w-40 as often as possible.

    7. 05-17-2009 09:19 PM #7
      40 has better protection

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