I just bought this car and decided to use mobil super synthetic blend high mileage oil and i havent noticed any leaks and nor did i notice any before i used this oil i just put it in because its a 16yr old car with 137k miles so figured it would be good to use but now on my next change i feel like going with just a non high mileage but stay with a synthetic blend now would this be an issue or cause leaks if i stop using the high mileage stuff?
High mileage syn blend to just syn blend ok?
- Thread starter CARGUY40
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No problem.
I switched from normal oil to high mileage back to normal in the past in my 370k miles LS400 without any leak.
I also switched between dino and synthetic oil in that car without problem either.
I switched from normal oil to high mileage back to normal in the past in my 370k miles LS400 without any leak.
I also switched between dino and synthetic oil in that car without problem either.
It should be fine.
HM oils are not a one way street, you can start and stop as you wish.
HM oils are not a one way street, you can start and stop as you wish.
All oils have seal conditioners in them, but HM oils have a bit more. The idea is if you have an old seal that is a little shrunk and a bit brittle, the higher dose will help them expand a little and become a bit more flexible. This can help control a small leak from a borderline seal, if the seal is torn it will not help, if the seal is good it should not hurt. They would test for that.
But if a seal has "dried out" over time, adding seal conditioner can help. Once the seal has been treated, it should be in a better condition even if the oil is changed to a regular oil. The HM oil will leave it better off. The regular oil will not pull the rug out and turn it to dust.
But all this depends on the polymers used in the seals. I've heard some modern cars use better polymers, that should last longer but are also unaffected by the HM seal conditioners, which do nothing to them.
Some (but not all) HM oils are also a little thicker to help control burning and leaking.
I hear Valvoline MaxLife SynBlend (semi-synthetic) is a excellent HM oil. I would happily use that as a regular oil in my car instead of Valvoline DuraBlend if I got a good deal on some MaxLife. Even though I don't need a HM oil.
But if a seal has "dried out" over time, adding seal conditioner can help. Once the seal has been treated, it should be in a better condition even if the oil is changed to a regular oil. The HM oil will leave it better off. The regular oil will not pull the rug out and turn it to dust.
But all this depends on the polymers used in the seals. I've heard some modern cars use better polymers, that should last longer but are also unaffected by the HM seal conditioners, which do nothing to them.
Some (but not all) HM oils are also a little thicker to help control burning and leaking.
I hear Valvoline MaxLife SynBlend (semi-synthetic) is a excellent HM oil. I would happily use that as a regular oil in my car instead of Valvoline DuraBlend if I got a good deal on some MaxLife. Even though I don't need a HM oil.
You can switch back to a regular oil after using a high mileage, it doesn't matter. Conventional, synthetic, semi synthetic, high mileage, you can switch between them as much as you please.
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