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Unread 03-16-2008, 02:22 PM   #1
Manuel Medina
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Join Date: Mar 2004
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Mobil 1 15w50 in Jeep Liberty 3,7 2002

I have been using Mobil1 15w50 Full Synthetic motor oil since 15.000 km now the jeep has 65.000 km, i'm working here in Caracas , were the climate is always hot (28 - 35) ºC , heavy traffic...

I've listened a periodic rattling noise but only when the engine temperature gets hot , it doesn't sound when the engine is cold.

I've discovered this noise a few weeks ago, don't know when it started to make this noise. ( from the top left of the engine , near the ac compressor/left valve cover)

when it starts to sound , the frecuency of the noise increases with increasing engine rpm.

I think that maybe the problem is oil viscosity related, because it doen't make any noise when the engine is cold.

this week i'll make a oil change , and i will try a lighter oil, maybe 15w-40 ? or go fot the Castrol Synthetic 10w-30 ??


thanks for your help.

Regards.

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Unread 03-16-2008, 02:59 PM   #2
Jakked
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I think 15W-50 is definitely overkill. I lived in Texas before with temperatures regularly > 38 C, and city traffic, and I stuck to 5W-30 Synthetic with no problems at all.
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Unread 03-16-2008, 03:56 PM   #3
cowpie01
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It is always better to stick to the manufacturer recommendations on oil weights. The concern is that there are a lot of small channels the oil has to go thru in an engine, and heavier weight oils are not necessarily a good choice even in hotter climates. I realize that some feel the lighter oils are mostly about fuel economy, and there is a lot of truth to that. however, the engine tolerances are a lot tighter than older engines, and the weight of oil used can have a more critical impact on the life and operation.

Even class 8 semi engines (which I operate regularly) show dramatic differences when you deviate from the recommended oil viscosity. Even varying the type of fuel filter flow will cause noticable changes in performance.

If you are really wanting the best protection, then maybe use synthetics exclusively (no brand recommend, that is another discussion). But stay with the recommended viscosity grade.
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Unread 03-16-2008, 04:28 PM   #4
Manuel Medina
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Thank you for the recommendations I will change the oil this week , and then see what happens... i've using that oil since 15.000km, now I have 60.000km ... I hope that there's no damage to the engine.

When I first did that oil change at 15.000kms almost every oil shop here told me to use grade 50 oil Synthetic.


i'll post when i get the results of changing for the lighter oil (10w-30) .. also hoping that that noise is gone!

Thanks
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Unread 03-31-2008, 11:04 PM   #5
Manuel Medina
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made the oil change... the periodic rattling noise has almost gone... you can still hear it , but now is more quieter...

now i'm using 10w-30 Synthetic ... insted of the mobil1 20w-50

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Unread 04-01-2008, 02:58 AM   #6
cowpie01
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That should work fine for you, Manuel. Good choice.
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