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100,000 mile service done

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Old 05-17-2018, 11:41 PM
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Default 100,000 mile service done

Did 100,000 mile service at 110,000 miles

3.5na
plugs still looked good
front axle oil was still clean before changing
rear axle oil still clean (no clutches like old limited slip to contaminate fluid anymore) changed
transfer case oil clean - changed
trans fluid dark and dirty (changed at 50,000 before)
coolant changed - getting discolored some

I think in reality plugs could go 200,000
front and rear axle oil could go lifetime
transfer case oil could go lifetime
coolant could go 200,000
Trans fluid may start changing at 25,000 intervals (snowplowing)
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Old 05-17-2018, 11:46 PM
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Good info, thanks for sharing.
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Old 05-18-2018, 12:29 AM
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Just an FYI the lv trans fluid turns dark after about 5k miles or so by nature.
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Old 05-18-2018, 12:54 AM
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I thought trans fluid isn't supposed to be changed until 100,000 miles per the service manual
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Old 05-18-2018, 05:25 AM
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You may want to check the plug gap, even though they look good. I changed the plugs on my son's 3.5 recently. They looked good, but must have burned down a bit. All plugs were 010 over
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Old 05-18-2018, 06:47 AM
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Originally Posted by redranger04g View Post
I thought trans fluid isn't supposed to be changed until 100,000 miles per the service manual

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Old 05-18-2018, 09:06 AM
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Kevin, What brand did you use for coolant? Did you use Motorcraft or a different brand?
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Old 05-18-2018, 10:48 AM
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Brake Fluid? I would suggest trading out the brake fluid at some point soon - I like a 2-3 year interval. I rely on my brakes ALOT because of city traffic. Knowing Chicago traffic I'd say you probably do too.

Otherwise good to see. How many years are on the vehicle?
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Old 05-18-2018, 01:06 PM
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Originally Posted by jordan15screw View Post


So every 150,000 miles. Why is OP recommending every 25k?
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Old 05-18-2018, 01:10 PM
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I would never judged the look of a spark plug to determine serviceability. NO WAY 200,000 MILES. Never heard or read of it.
Denso Corp. claims it but I don't believe it.

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