Andrew said:Synthetic on your high mileage 5M.. ROFLMAO... Don't make that big mistake, you'll wreck your engine. AFAIK petrolium based motor oil helps fill holes in your engine, and helps stop leaks. Switching to synthetic will flush all of that helpfull buildup in your engine, and cause leaks and oil consumption..
dan12771 said:theirs been a few posts from people that have switched to synthetic and they said it did cause leaks so chance's are you wouldn't want to go synthetic with your high milage 5m.
Lets get it straight once more... I answered his post.. nothing more.. nothing less.. His logic was severly flawed, as even you can point out. Or maybe you missed the sarcasm?Flyin' Hawaiian said:Okay, let's get it straight once more...
Dyno oil does not "build up", what it does is it tends to swell up all rubber seals in your engine, it's just something dyno oil does.
Synthetic oil does NOT allow rubber seals and gaskets to swell, so what happens to an engine that has been running dyno oil for years is it allows the seals/gaskets to shrink back to their normal size. Unfortunatley, once this happens, these rubber parts are unable to keep the oil from passing around themselves, which starts the leaking process.
If you have not run synthetic oil in your vehicle in the past 30~40k miles, I'd suggest not to change over. If you really feel you have to run synth, go with a blend first to see how it reacts to it. You'll know if its going to leak within a week of running the new oil. If you don't see any leaks or wet spots around the engine, then try going to full synth.
The good news is that, in most cases, if you do start getting leaking after changing over, you can simply go back to a good dyno oil and within about 2 weeks the seals will swell back up and stop the leaking.
Uh guys...Magnus said:Lets get it straight once more... I answered his post.. nothing more.. nothing less.. His logic was severly flawed, as even you can point out. Or maybe you missed the sarcasm?Flyin' Hawaiian said:Okay, let's get it straight once more...
Dyno oil does not "build up", what it does is it tends to swell up all rubber seals in your engine, it's just something dyno oil does.
Synthetic oil does NOT allow rubber seals and gaskets to swell, so what happens to an engine that has been running dyno oil for years is it allows the seals/gaskets to shrink back to their normal size. Unfortunatley, once this happens, these rubber parts are unable to keep the oil from passing around themselves, which starts the leaking process.
If you have not run synthetic oil in your vehicle in the past 30~40k miles, I'd suggest not to change over. If you really feel you have to run synth, go with a blend first to see how it reacts to it. You'll know if its going to leak within a week of running the new oil. If you don't see any leaks or wet spots around the engine, then try going to full synth.
The good news is that, in most cases, if you do start getting leaking after changing over, you can simply go back to a good dyno oil and within about 2 weeks the seals will swell back up and stop the leaking.
Black Dawg said:If you're not turbo, or highly built, and run regularly at high RPMs, synthetic is just not necessary and just an extra cost. On a turbo engine, it is all but a necessity, on a high milage stocker, just run petrol, you'll be fine. I feel high milage engines need regular oil changes, and that gets expensive real quick with synthetic. Just my $0.02
to each, his own..... :wink:Magnus said:That's cool, everyone is entitled to thier opinion. (And we all know about opinions LOL ) I've been using syn oil in 4 of my cars over the last 10 years. I like the way it comes out cleaner, I like not having to change the oil for 5000 miles instead of 3000. I like the way my cars run when I have syn oil in. 2 of those cars were high mileage, ran petrol before. Both of them were quieter under the syn oil. I guess that's why I get so defensive at times, I love the stuff almost as much as I love my MKII. (Which has had syn oil in it from birth.)![]()