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Thread: Oil Change. Synthetic Or Regular?

  1. #1
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    Oil Change. Synthetic Or Regular?

    Hi Everyone. My First Post. Basic Question.

    I Have A 99 Durango With 276,000km on it.

    I have been running it on 10w30 and am thinking of changing it over to synthetic.

    Is this a Good Change?

    What type of Synthetic is Best?

    I Love In Ontario. Hot Summers And Cold Winters.

  2. #2
    Administrator IndyDurango's Avatar
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    99Murder/Redrum99, Welcome to the Durango Owners Club!

    At 171,500 miles, I'd continue doing whatever you have been doing. No real reason to switch at such a late stage in the game.

    With that said, Mobil1

    IndyDurango

  3. #3
    Senior Member Silver Ghost's Avatar
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    One of the potential problems is that synthetics don't cause rubber gaskets and seals to swell as much as they'd with conventional fluids. That being the case, at your mileage, you run the risk of leaks springing up around the oil pan and valve covers.
    If you intend to switch to synthetics, first use a high mileage semi-synthetic (synthetic blend), then switch to full synthetic. This will help condition the gaskets and seals and minimize leaks. You may still need to snug down on bolts or replace some gaskets anyway.

    Joe
    Joe 2004 RAM2500 SLT Bright Silver Metallic, QC, SB, Hemi, Line-X, TonneauMaster, RB-1 Nav Radio

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    Administrator FSTDANGO3's Avatar
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    Valvoline makes high Mileage synthetic that'll help swell seals.
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  5. #5
    Senior Member Silver Ghost's Avatar
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    Yeah - in the seal business you design gaskets and such so they won't swell (and break down), then the oil folks design a oil/lubricant to swell the gasket so you don't get leaks. The gasket standards are set for a maximum % swell for exposure in various oils (ASTM #1 and ASTM #3 usually) that often have no bearing on the aggressive nature of the oils currently in use.
    If you need an oil that'll swell the gasket, stick with a conventional or semi-synthetic brand. No need to spend big $$ on synthetics.

    Joe
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  6. #6
    Senior Member DCDAD's Avatar
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    Quote Originally Posted by Silver Ghost
    Yeah - in the seal business you design gaskets and such so they won't swell (and break down), then the oil folks design a oil/lubricant to swell the gasket so you don't get leaks. The gasket standards are set for a maximum % swell for exposure in various oils (ASTM #1 and ASTM #3 usually) that often have no bearing on the aggressive nature of the oils currently in use.
    If you need an oil that'll swell the gasket, stick with a conventional or semi-synthetic brand. No need to spend big $$ on synthetics.

    Joe
    My thoughts as well.

    Ron
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  7. #7
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    Thanks

    Excellent.

    thanks for the fast responce guys.

    Semi-Synthetic. I"ll give it a try.

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