which is better. i have a 97 2.4l with about 130,000. i know synthetic is better than regular oil but is it better for my car then the oil that has a special blend for the higher milage?
blink 777069 wrote:which is better. i have a 97 2.4l with about 130,000. i know synthetic is better than regular oil but is it better for my car then the oil that has a special blend for the higher milage?
well actually, it depends alot on the car. I've read reports about synthetics, and what i learned is that if a car was run on regular oil for a few years, then switch to synthetic it was 85% more prone to oil leaks or something like that, the seals are conditioned to normal oil. But on the subject, i would probably go with the high mileage oil. And i base this entirely on speculation lol
Ive been told leaks come from synthetics, but have also been told that it isnt true as well. Synthetic oils are cleaner and more refined than conventional, and dont have the 3 months to worry about, just the 3000 miles.
I have a 2200 sunfire with 98k
ive read that synth can promote oil leaks. but is that bad? if u have leaks, than it means u need some seals replaced. it may suck that you have to spend the money to fix, but that means ur fixing a problem that would have came up eventually even on conventional. right?
id liek to change to full synth if it is smart. what does everyone think?
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Synthetic is a better choice over regular motor oil. It has different properties and does not break down like conventional oil. The only disadvantage to synthetic is that supposedly, it does not seal the compression rings as well as conventional, but the end result is better fuel economy, so it can't be hurting it too bad. There are also many other reasons why it is better, but I don't have my books with me at this point to list them.
No, it has something to do with the properties of the oil
if your car has high mileage it may not be a good idea to do Synthetictc unless you rebuild. If you have been using Synthetic since the car was new then you are fine.
On the flip side it is waste to byn a Synthetic Blend there is not rule that says x% of Synthetic needs to be in the oil. It has been claimed that some synthetic blend have as low a 1% synthetics in them.
There are many myths about changing to SYnthetic but if you have bas seals there will be leaks SYnthetic is more vicous that conventional oil so if there are any leak the nature of the oil will make it look worse.
YOu are better of staying with an oil that is for higher mileage engines.
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I just switched to fully synthetic but im only at 42K miles. got 5 qt for $25 and a filter for 10. sucks but ill probably only change it every 5K.
There's a fleet of heavy trucks here in Ontario that did a test to see if synthetic was actually a better oil, so they got 25 brand new trucks, and at every service interval they only changed the filters and topped up the oil. Every truck is still going and they are all well over a million kilometers, still never having the drain plug pulled. That's heavy trucks, but diesels are worse on oil then gasoline engines. Just a thought.
this doesnt make sense.
if the leakign problem that comes up cant be fixed by replacing seals because of the natural properties of the synth, than why in new engines does it not leak? if seals dotn fix the problem than the synth oil would be leaking in everyones new cars.
so again, wouldnt replacing the seals solve any leaks when switchign to synth
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whoa, ok first i already said i know about synthetics and them being better then regular oil. im asking about special formulated oil suck as those for higher milage engines etc.
From what I understand about high millage oils is they contain a grerater % of detergents in them to keep everything cleaner, also the package says something about conditioning seals, but I dont know about that.
this goes over and over and over again. From reading tons of posts with mileage over 100k that hasnt ALREADY ben sing synthetic id stick to a high mileage oil
ie valvoline duralife high mileage or castrol high mileage
if it has lower miles and then start synthetic it should be fine.
Again all cars and every application is gonna be different. Some may use synthetic at 300k vs 50k and the 50k could leak i think a big factor is how the engine was treated and maintaned i wouldnt do it on 130k unless youve had the car since new and have taken well care of it. I just turned over 180k On my 2.4 two days ago ive been using ac delco filter and valvoline 10-30w duralife high mileage
If you experience leaks from switching to synthetic, the oil isn't your problem, it's merely helped to expose an existing issue with your seals.
With conventional oil you get sludge buildup which can gum up & effectively plug any gaps in your seals, thus preventing leakage. By flushing your oil and replacing with synthetic, you're not gonna get the "sludge" that you would with regular oil meaning that your leaks will eventually be exposed as the existing buildup breaks down.
Make sense?
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KreepyGuy wrote:If you experience leaks from switching to synthetic, the oil isn't your problem, it's merely helped to expose an existing issue with your seals.
With conventional oil you get sludge buildup which can gum up & effectively plug any gaps in your seals, thus preventing leakage. By flushing your oil and replacing with synthetic, you're not gonna get the "sludge" that you would with regular oil meaning that your leaks will eventually be exposed as the existing buildup breaks down.
Make sense?
exactly what i thought.
and that is what makes sense. and getting leaks from switchign isnt a bda thing. its a GOOD thing. cuz that means u just found soem seals that were already bad, just concealed by conventionl oil. so nwo you can not only have better oil in yoru car, but now have seals that are actually sealed. sounds liek win win.
so i dont get why then, people say dont put in synth in high mileage engine. seems liek that would be a SMARt thign to do, to put synth in. since it woudl expose areas that are worn. and you coudl get them fixed and then have a better running high mileage engine.
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OK, you're right on about the seals leaking w/synthetic because of the crud being cleaned out. If you've got a motor with a LOT of crud buildup, don't switch to synthetic because it cleans it out & if you've got too much, it can clog your oil pickup tube or oil passages & goodbye motor!
Also, if you're going to run synthetic; run a PAO based synthetic (like Mobil 1 or Amsoil). Generally speaking, if you're getting so-called synthetic in the $3/ qt. range - its not PAO based. There was a court case about it - what they do is "hydro crack" the regular dino oil. Since the PROCESS they use to do this is synthetic, they won the court case allowing them to call it synthetic. FYI.
there has to be a way to make the switch.
seems like the best thing u could do for a old car is switch to synthetic as long as you take all the precautions watch for leaks and fix them.
now what about oil pickup and passages, can this be avoided? maybe runing a couple synth blends first then going through replacing the lines and filters?
is there a way to say flush the oil system of all sludge or most of it before you even start the car back up with synth? or do u have to run it through to get the sludge to break free?
just seems smarter to me to switch to synth on a high mileage motor. but u gotta do all these thigns that may cost money, but ur gunna end up with a older motor that will last longer and perform better than if u didnt make the switch.
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Well, it can be done of course. It just depends on how gunked up the motor is now. I would think if its not too bad now, try switching to synthetic & keep a real close eye on when the oil gets dirty & change it early a time or two.
They've got plenty of motor flush products avail. too if you want to chance it. It really depends on how bad it is now.
