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The switch to Synthetic... What leaked?

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Old 03-31-2012, 12:46 AM   #1
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The switch to Synthetic... What leaked?

First of all: This is NOT a thread asking whether or not I should go to synthetic... I've seen too many.

My 2003 5vz-fe is going on 150,000 miles and I'm thinking about switching to synthetic after I get through my list of maintenance projects. Most important to mention, since it relates to oil leaks, replacing the valve cover gaskets, cam plugs, and changing the gasket on the semicircular plugs.

So for those of you that made the switch and complain about leaks... what leaked and how hard/expensive was it to fix? I want to know what I need to look out for and the POTENTIAL risk. I'll be going synthetic all around - engine, tranny, diffs, transfer case.
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Old 04-02-2012, 11:03 AM   #2
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TTT. In short... when switching to synthetic at 150k, what are some potential leaks that i can look out for or be concerned about?

I'm swapping out valve cover gaskets, cam plugs, and FIPG on semicircular plugs prior to the change so those technically should be okay.
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Old 04-02-2012, 12:12 PM   #3
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I switched my 96 over to synthetic when I bought it at 60,000 miles. I owned the truck for 5 years to 110,00 miles.

I never fixed anything - as I never had a serious problem.

Oil weeped out at the oil pan/gasket area. I also lost or consumed 1/2 quart of oil every 5,000 miles. No smoke or no signs of oil burning at the tailpipe. I changed the oil every 5K miles, so the oil level never bothered me.

If the truck sat in the driveway for a couple days .....I'd get a brief lifter tap when I'd first start it up. That tap would eventually go away after the pressure built up again in the lifters - only a couple minutes.

Other than that.... not a lick of problems anywhere else. I used synthetics in all the diffs, tcase, and transmission too.
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Old 04-02-2012, 12:26 PM   #4
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Your wallet will leak a little more cash on oil.

I switched my truck over to everything synthetic after I bought it. I bought it used with 42k miles. No leaks here.
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Old 04-02-2012, 12:36 PM   #5
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I switched my 98 3RZ over at around 80k. No leaks.

Switch the 4.7L over at/around the same mileage. No leaks. It's got +150k on it now.
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