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  #13  
Old 05-30-2010, 10:59 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

I changed over the synthetic at about 130K. Just check your oil level just in case you have a oil leak. If you do have a oil leak, switch it back to the normal stuff.
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Old 05-31-2010, 12:53 AM
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Re: Switching to Synthetic Oil in High Mileage Engine

i switched at 60k miles and it didnt leak a drop. it runs much smoother now.
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Old 12-23-2010, 10:06 AM
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Re: Switching to Synthetic Oil in High Mileage Engine

Have 88,300 on mine thinking about going syntetic but I change my oil every 3500 miles. Is synthetic better in the winter? I also noticed dealer uses 5w20 now instead of 5w30? Is this better to use in the winter?
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Old 12-23-2010, 12:16 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

I know this is a bit of an 'apples to tea kettles' comparison, but I bought a 96 240SX with 135k miles on it, switched to synthetic at 145k miles, sprung a front crank seal nearly immediately, replaced the seal, ran the odometer up to 272k miles on synthetic then sold it. For me, changing a $4.00 seal was well worth the bit of 'extra insurance' that came with using synthetic.
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Old 12-23-2010, 01:46 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

i plan to change to syn as a test of my engine for leaks and if it dont ,,i will still only use a blended oil,,,mine has 170000,,5.9
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