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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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  #14  
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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  #16  
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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  #17  
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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  #18  
Old 04-08-2015, 11:39 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

what about changing "from" Synthetic Oil to High Mileage Engine Oil
This fella at Jiffy Lubetoday talked us into changing, we had a 3 hour drive after the oil change. about 70 miles into the drive the engine started knocking really bad

we made it home, but now I don't know what to do ? Make them fix it, or is that reasonable?

Any and all suggestions are welcome

1998 Jeep Grand Cherokee 253,000+ miles (4.0 6 Cylinder)
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Old 04-09-2015, 11:13 AM
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Re: Switching to Synthetic Oil in High Mileage Engine

First, you're in the wrong forum. This is the later model Jeep forum. Second, check the oil level and make sure it is full. Third, look for oil leaks, as sometimes switching to synthetic at high miles will cause leaks. Good luck, and watch out for the mosquitos this summer up in Kenai.
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  #20  
Old 04-09-2015, 03:39 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

"from"

Synthetic Oil to High Mileage Engine Oil


oil was still full after 70 miles climbing the mountains and I just checked it again and it is still full
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Old 04-09-2015, 07:50 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

I'd go back to synthetic if you weren't having any problems. Kind of, if it ain't broke, don't fix it kind of thing. With that many miles you may have to go to a little heavier oil at some point, at least in the spring summer months. In the cold winters, a little thinner oil. Are you using a multi-weight oil (i.e. 10W-30) or a single weight oil, such as 30W or 40W?
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Old 04-09-2015, 09:31 PM
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Re: Switching to Synthetic Oil in High Mileage Engine

Thanks for your time and replying so quick
Also sorry, I should have looked 'where' I was posting, I just followed the
"Re: Switching to Synthetic Oil in High Mileage Engine" thread


Looking on the invoice from Jiffy Lube they put in "Pennzoil Hi Mileage 5W30"

This knocking is awful, I just started it up and the knocking starts right away, engine doesn't even have to warm up first
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Old 04-10-2015, 11:15 AM
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Re: Switching to Synthetic Oil in High Mileage Engine

I would think that at 253K+ miles you'd probably be needing a heavier oil. What weight oil were you running with the synthetic? 5W30 seems a little light to me. Can you tell where the knock is coming from? As soon as it starts, is it a real deep tone knock, or is it a higher pitched knock? Can you tell if the knock is at engine RPM (probably lower end), or half engine RPM (probably top end)? Deep, low pitch knocks are usually main bearing (deepest tone) or maybe a rod bearing (a little higher pitch), piston noise is more like a rattle than a knock, and top end (lifters/rocker arms) are usually a higher pitch, mostly like a clicking sound rather than an out and out knock. With that many miles, I'd probably put my money on main/rod bearings, as a good synthetic will normally prolong engine life and keep the top end in good shape. The bottom end takes the most beating, especially if you repeatedly put a lot of load on the engine.....mountain climbing, towing, lots of WOT use, etc. It could also be that it is near time to give some serious consideration to major engine work, if you want to keep the vehicle. Without hearing the noise, it's hard to figure out, but for starters, if they've put in a lighter weight oil, I'd switch to a heavier oil and see what happens. At best, this would just cover up a problem that is probably already there. Good luck and let us know what you find out.
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Old 04-10-2015, 11:54 AM
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Re: Switching to Synthetic Oil in High Mileage Engine

Quote:
Originally Posted by LadyKenai View Post
what about changing "from" Synthetic Oil to High Mileage Engine Oil
This fella at Jiffy Lubetoday talked us into changing, we had a 3 hour drive after the oil change. about 70 miles into the drive the engine started knocking really bad

we made it home, but now I don't know what to do ? Make them fix it, or is that reasonable?

Any and all suggestions are welcome

1998 Jeep Grand Cherokee 253,000+ miles (4.0 6 Cylinder)
First mistake was Jiffy Lube. Don't your local dealers have express lanes at the same price points?

You MAY be able to recover something from Jiffy Lube, where a lawyer in your area familiar with vehicle service issues would be worth a few bucks for a consultation.

There are high mileage synthetic blends... frankly think they are marketing wallet drains. I had more than that miles on the same engine and just ran a wide viscosity Castrol synth until the local dealers started the express lanes, and they used Pennzoil.
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