walter1234

What do you guys and gals think about the extended drain mobil 1 that just came out? Would you actually leave the oil in your car for that long? I'm willing to give a try.

GM Muscle

iTrader: (9)

The regular Super Syn has been tested past 10K or so. I bet the new stuff could do 15,000 miles. I personally wouldn't use it for that long but I bet the oil would be fine. Probrably have to change your filter every 5-6K miles.

Mike98WS6

iTrader: (5)

I would love to try it out. But I'm old school. I've always did my oil changes at 3k like clockwork.

Another_User

Me too.

95zpro

nothing beats maintaining routine maintenance especially in a high performance eng like the LS1. If you enjoy ie.occasionally do some spirited driving I would plan on changing the oil more frequently than what the manufacturer recommends...

ZR2877

I like to change mine around 5k. I wouldn't feel safe waiting till 15.

Patman

This new version of M1 looks interesting, it's got a better additive package in it and is slightly thicker too. Plus they finally have a 10w40 synthetic!

JEB99TA

iTrader: (32)

Mobil1 Fully Synthetic here ... still every 3,000 miles ... hate that black gunk that builds, internally ... never can be too safe with a 10,000+ engine (minus the mods), IMHO.

blaSSt

iTrader: (7)

Well said. The oil filter would definately be the limit. When they get clogged they have a bypass valve. Then there's no filtration. No matter how good the oil is it doesn't get cleaned up.

Traditional 3K/six months max here!

CaptUSA

iTrader: (5)

Depending on price, I'd probably run it about 8K miles. I'm interested to find out more about it though.

Scott Purdy

I've been using Mobil 1 synthetic in my GenIII engines since they came out, and started changing oil and filter at 5000 miles. At the trade-in (well over 100,000mi.) the valve train looked like new! Absolutely no gunk or build up of any kind under the valve cover. This time I'm only going to change the oil and filter when the "Change Oil" light comes on, which was 7500mi. the first time. I've been using Mobil 1 almost since its inception, and have always gone over 100k with zero problems. We started using synthetic in our recrip. aircraft engines (Aeroshell) 20 yrs. ago, and found temps. lower, and oil consumption reduced considerably.

Shirt_Ripper

Even if the oil doesn't break down its still gonna get dirty. Say it takes 5000 miles for your oil to get dirty. That means youre just running high quality dirty oil for 10000 miles. Changing the filter every 5000 miles or so is gonna help a little but the oil is still gonna be dirty, and besides if youre crawling up under the car to change the filter why not just pull the plug while youre at it.

Another_User

The safest way to change your oil is to just change the filter and add about a quart.

Just kidding.

Hot02SS

Change mine every 3,000 miles or 3 months, not a day over.

Patman

Those of you who are still stuck in the 60s mentality, and doing 3k intervals, you really need to take a lot at some oil analysis results which show that the oil can still be perfectly clean at 3k, and at 6k and beyond in a lot of cases. With good air filtration you can keep most of the dirt out, and if your engine is running good you won't get very much fuel in the oil (in my reports I always see 0.5% fuel or less) So if oil analysis proves that oil is not toast by 3k, why do so many people still feel the need to change it? Why use expensive synthetic if you're not going to run it longer? You might as well use dino oil.

blaSSt

iTrader: (7)

Patman you make a good point. I agree the oil is good for a long time. But the filter is toast in 3-4K miles. It then starts bypassing, meaning there's no filtration taking place. Oil Filter Study It needs to be changed. At that point you can do what Another_User said or what Shirt_Ripper said.

The reason I do it on time is water intrusion. Living in a humid climate, the engine breathes night to day and collects water over time. Some of it gets vaporized out at operating temp, but not all of it. If I was in a dry climate I might not be so picky about changing regularly.

Patman

The filter is not toast in just 3-4k, it'll go much longer. I would have no issues with going as high as 10k on the same filter. The LS1 synthetic oil life study showed it could go even longer, I believe he went 12 or 13k on the oil filter before the analysis results showed it needed changing (by the insolubles level)

Water will be removed from your oil as long as you're getting the oil good and hot quite often. If you do short trips in cold climates, then moisture will not be removed as much, but in Texas your temps get hot enough out there that even short trips won't cause much in the way of moisture. If you do an oil analysis on your oil at the end of your next interval, I bet you'll see 0.0% moisture in your oil.

hourang

iTrader: (6)

thank you patman, i was getting all worried that i waited too long for an oil change, 5-6k miles, when i changed the oil it looked just as good as when i change it at 3k. i also bought the wrong filter, got distracted and forgot to ask if i had the right one, so i reused my old one, i had no choice i had already drained the oil. i knew from before that oil filters can usually last 2 or 3 oil changes and its not a must to change them so i figured it was fine. thanks for comfirming it. man im glad i came along this post, $50 for an oil change every 3k miles is costing me a lot, now i can relax knowing i can at least go 5k.

hourang

iTrader: (6)

btw, i think they are planning on replacing the regular mobil one with the new stuff, at least by what the guy at autozone told me.

Patman

Nope, he's wrong. The regular Mobil 1 is still going to continue, as it's the stuff you're supposed to use while still under warranty. The EP stuff is not new car warranty approved. (it's antiwear levels are higher)