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Old 06-13-2007, 08:17 PM
HenryB HenryB is offline
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Location: New Jersey
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Heavier OIL to quiet down my Isuzu FRR?

My Isuzu runs great but sounds like a school bus would heavier oil quiet down a deisel engine? Valves are adjusted no exhaust leak. Trucks in great shape I just like things a little bit quieter.
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  #2  
Old 06-13-2007, 08:24 PM
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fiveoboy01 fiveoboy01 is offline
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Is it valvetrain noise you're hearing? Are you sure?

The fuel injection system on diesels, specifically the injection pump, makes quite a bit of noise and the oil isn't going to quiet it down.
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  #3  
Old 06-13-2007, 10:06 PM
twj721 twj721 is offline
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ESP WHEN YOU ARE PRACTILY SITTING ON TOP OF THE MOTOR about the only thing you could do is maybe try to put some more or some kind of noise reduction panels under the cab
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  #4  
Old 06-13-2007, 11:17 PM
HenryB HenryB is offline
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The Npr's are 4 cyl and a lot quieter.
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  #5  
Old 06-15-2007, 12:51 AM
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mini14 mini14 is offline
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like 5 0 said the injection pump makes most of the noise..thats why common rails are so quiet.
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  #6  
Old 06-15-2007, 09:11 AM
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outlaw1960 outlaw1960 is offline
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try to find #1 diesel or add cetane boost, should help with injector noise after a tank or two. Heavier oil will make it noisier on start-up, injector pump will work harder until the engine warms-up, and it could increase wear as well

Last edited by outlaw1960; 06-15-2007 at 09:15 AM. Reason: add
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