I've ran all the High Mileage oils available at my local Walmart. I definitely noticed more leaks with Mobil 1 Extended Performance High Mileage and Pennzoil Platinum High Mileage (but also smoother quieter engines). switched to High Mileage blends only after realizing all the oem oils my rides come with are blends (1996 to 2011-6 different vehicles). Several mechanic friends of mine prefer castrol so i use the gtx green bottle. definitely noticed fewer/smaller leaks with that and valvoline red bottle. Always used 10 30 at 3 k intervals.
Best high mileage oil for leaks
- Thread starter cmarshall78
- Start date
Maxlife red jug
We have 2014 Forte that was dripping oil a bit, not much and didn't need to top off between oil changes. I had to wipe off a drop of oil off garage floor every 1-3 days.
I tried several High Mileage oils, AT205, Rislone, Blue Devil and what not, was still same, not better, not worse.
At one point I decided to try Ceratec just to see the friction reducing effects, as a side effect it stopped the oil drip...
I tried several High Mileage oils, AT205, Rislone, Blue Devil and what not, was still same, not better, not worse.
At one point I decided to try Ceratec just to see the friction reducing effects, as a side effect it stopped the oil drip...
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This is not true even though it gets regurgitated here frequently.
It depends on grade. With both Pennzoil yellow-bottle and Castrol GTX for instance, 5W-20 and 5w30 are blends, but 10w30 and thicker are legitimate conventionals still.
Lucas
Carlostrece
$100 Site Donor 2025
I recommend a high mileage conventional oil if you can find it. Otherwise a high mileage synblend. I would avoid full synthetic.
Also test your PCV by removing it, then shake it with moderate force/speed. If it rattles that means it's still good. If it doesn't rattle it's clogged and you should replace it. A clogged PCV can cause or increase oil leaks.
If none of the above does it, then as a last resort try one of the seal conditioner stop leak products. Other folks can recommend which to try. I've never tried this myself, but I've heard it sometimes works.
Another option of last resort is to use a slightly thicker grade of oil. For example, you could switch from 5w30 to 5w40 or 10w40. That might not be ideal for your engine, but it won't kill it and will reduce leaks, especially if the oil is conventional or blend.
Also test your PCV by removing it, then shake it with moderate force/speed. If it rattles that means it's still good. If it doesn't rattle it's clogged and you should replace it. A clogged PCV can cause or increase oil leaks.
If none of the above does it, then as a last resort try one of the seal conditioner stop leak products. Other folks can recommend which to try. I've never tried this myself, but I've heard it sometimes works.
Another option of last resort is to use a slightly thicker grade of oil. For example, you could switch from 5w30 to 5w40 or 10w40. That might not be ideal for your engine, but it won't kill it and will reduce leaks, especially if the oil is conventional or blend.
I was just at Wal-Mart and looking for some Super Tech 5w30 Full Synthetic oil. They did not have any, but they did have it in a Full Synthetic High Mileage. I looked at the other High Mileage Brands Like QS, Mobil 1, Castrol and maybe another or 2. I do not recall all of them. None of them make any reference to seal conditioning and reducing oil leaks or reducing oil burning. I have not looked at a High Mileage oil in over 10 years. I recall them specifically making these claims on the package. They were also NOT Energy conserving at that time. In other words you got worse gas mileage if you used one of them. I noticed today all of the High Mileage oils I looked at said Resource Conserving in the round symbol. Again, no mention to seal conditioners or reducing oil consumption. Things have changed apparently. Do they still add seal conditioners but are too reluctant to make any claims? What have I missed?
Best High Mileage oil Mobil 1 High Mileage
Best budget High Mileage oil Valvoline MaxLife red bottle.
Best budget High Mileage oil Valvoline MaxLife red bottle.
AZjeff
$50 Site Donor 2023
Pennzoil conventional 10w30 HM stopped a slight RMS leak in the 127k '02 Wrangler 4.0 , then I decided to try Supertech High Mileage Full Synthetic 10w30 to save $5 and it came back in 1000 miles.
The only time I used a high mileage oil it was for a rear main seal WEEP in my then '07 Kia Sportage (80,000 miles) 2 years ago. 10W-40 High Mileage Syn Blend Mag1. Cured the weep in short order. I sold the car a few months later, told the new owner about that RMS and admonished him to keep using that kind of oil. Gave him a bonus quart of that oil I had lying around.
I like the first and original High Mileage oil. Valvoline Maxlife... However, don't expect miracles with your old oil leaker.
Patman
Staff member
When the very first version of BOBISTHEOILGUY started, back around 99 to 2000, that original version of Maxlife was the darling of the small group of us that were here. Bob was really pushing the fact that moly was a great antiwear additive (mainly because he sold Schaeffer oils that used a lot of it) and the original version of Maxlife used a lot of moly (around 250-300ppm IIRC, which was the highest amount for an off the shelf oil at that time) I ended up switching my 95 Firebird Formula over to Maxlife back then. We were all quite disappointed when Valvoline reformulated Maxlife and basically took out all of the moly.
Did you mean that you judged Pennzoil Platinuminum High Mileage Full Synthetic as less effective in stopping leaks?
Please provide us with a brief history of who Bob is. Is he the creator of this site, and does he still make active posts on this site?
Patman
Staff member
Bob Winters originally started the site, he was (and may still be) a Schaeffer oil representative from Ocala Florida. He stepped away from the site sometime around 2006 or 2007 or so IIRC and he posted occasionally after that but he hasn’t posted anything here since 2012. I had heard about 10-12 years ago that he might have had a stroke but that he was recovering well. I briefly chatted with him via FB sometime around 2017, although looking back I’m not sure if it was really him or an imposter (because a year later I got a request for money from that account)
I would love to know if he is still out there and doing ok. He must be proud of how big this site has become!
Triple_Se7en
$50 Site Donor 2024
Thread-starter CMarshall78 has never returned to post in this thread.
His return has the same odds as Pampers seeking a Patent on High Mileage Oil Diapers.
His return has the same odds as Pampers seeking a Patent on High Mileage Oil Diapers.
Yeah, probably not.
If you want some REAL , no nonsense High Mileage oil cross the border to Mexico or anywhere in South America, and you will find for sure 25W60 Conventional High Mileage oil.
Now that is the good stuff most likely heavy Group 1 base maybe even Bright Stock, Nice and goopy like Honey.
If you want some REAL , no nonsense High Mileage oil cross the border to Mexico or anywhere in South America, and you will find for sure 25W60 Conventional High Mileage oil.
Now that is the good stuff most likely heavy Group 1 base maybe even Bright Stock, Nice and goopy like Honey.
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