you guys think i should change the oil because i just switched to synthetic a few months ago and i think i have the 5w30 which is for the cold right? 10w30 is for warm weather? i dont remember much =(

 

10W is for warm weather..

If you have 5W youll be fine. Leave it in there till you wanna change it then go back to 10W..

I use 5W for the winter months and 10W for the Summer months and I actually just changed to 10W last week from my 5W winter oil

-matt

 

No need to change. It's a waste of money.


~limsandy

 

Look at the minimum and maximum temp rating on the bottle of the oil you buy. 5w30 can be run all year long.

 

But 5w30 would become too thin for summer use. so, it just ok for summer, you'd better switch to 10w30 for optimum

 

A synthetic 5W-30 will be fine year round in your location. It's much more shear stable than conventional oil. No worries.

 

Would it be too thin or wouldn't it is the ?

The only way to know is to test the oil after 10000. When I ran Durablend, I changed the oil ever 5000 miles. Oils today are way better than they were back in the 50's and 60's. There is no need to change your oil ever 3000 miles because it's a waste of money, period.

After reading a lot of the tests that Bill99GXE has documented, I trust that Mobil 1 will hold up because it will. To be honest, 10000 miles is not a lot miles when there are tests that show minimal wear even changing dino oil after 25000 miles.

 

I would love to see an oil analysis showing dino oil is good for 25,000 miles! That just isn't possible. Even Amsoil breaks down between 15-20,000 in Maximas.

 

Just for comparison sake:

http://neptune.spacebears.com/cars/stories/mobil1.html

 

im using mobil 1 supersythetic which i just switched to from the normal oil, and i heard that when you first switch to systhetic you need to change the oil after 1000 miles to get rid of the other oil?

 

Just like people said it wasn't possible to run a 200 amp alternator and have good driveability. Anything is possible and I'm not recommending people try this with their own cars. At the Limo company I used to work for, the mechanics forgot to change the oil in one of the sedans and it went 55000 on the original oil from the dealer (dummies). The engine still didn't blow one bit of smoke.

Either way the tests have been done but in the particular case I'm referring to was for testing engine wear. You still have to use good oil to reduce engine wear.

 

I wouldn't change out the synthetic after 1000 on the first fill, seems like a waste to me. Just make sure to check for drips, in case you've got any bad seals.

 

No need to change after 1k miles, just don't go an extended interval on the first fill.

 

Synthetic and dino are fully compatible. No need to change for concerns of the old oil. You could even top off syn with dino if really needed.

 

Look deeply inside Nissan manual. It stated clearly that you cannot mix synthetic oil with dino oil.

 

Some people switch between 5w and 10w between winter and summer, but if you've got either one in there at the "wrong time", you'd be really wasting time/money to switch. The differences are really not worth it, especially going from a 5w up to a 10w. I personally use 5w all year (even though I'm in AL), simply because the manual says to. I may start using 10w in the summer, but it will never, ever accelerate my time to change oil, and if I've got a fresh thing of 10w in and then it gets cold I'll put the miles on it before switching back to 5w.

 

For what technical reasons can't you mix?? They are the same thing. One is natural and one is artfically made. But the are both the same thing.

 

I use 5W-30 Mobil 1 SuperSyn all year round in mine, no exceptions... I switched to synthetic last summer. I think I was down about 1/2qt of oil at 3000 miles since the last oil change (where I put in 4.5qts and an STP S6941 oversized filter)

 

Don't blame on me. I just repeated Nissan's recommendation. That should be there for a reason.

 

so what are the change intervals for when you switch to synthetic? i did this about 4k miles ago.. should do an oil change?

 

look deeply in this forum for many opinions. i saw some oil analysis on the org a while back. the best time frame i saw was to change syn every 10k and filter 5k. Others say to change even later. Personally, when I switch at 10k on my car's odometer, I'm going to change the syn and filter every 5k. It won't break down, but I want to keep it clean and that will be easy to remember. Mobil 1 is the best, imo. nissan wants 5w-30, so that's what i'll use year round. GTX right now and only OEM filters.

 

now its been 3,000 miles since i switched to mobil 1 synthetic ^^

 

really 10k miles and 5k for filter? thats alot..

u think for us that just switched to synthetic should do a change at around 5-6k on the filter and syn? just to be safe? or just wait for the regular intervals?

 

that what you say now but i work in a lube shop and there are some pretty messed up cars that dont change their oil every 3000...so many leaks lots of knocking little lubrication, and dirty dirty oil....once the oil gets dirty and you change it, check it and its still dark you have alot of junk in your oil system and its going to take a few flushes to get out....you oil should be almost clear on the dip stick when you check it right after a change...i know mine is...i'll only use valvoline, unfortunitly where i work they ony have quaker though

 

this is exactly what i'm planning on doing on my next oil change... run mobil1 to 10k or so and change the filter 1/2 way.

 

I've been using Mobil 1 10W-30 on my car for 18k miles. I change it every 3500 miles and I've had no leaks, no complaint at all. When I switched from blend to full synthetic it was like day and night difference. Engine is smooth as silk compared to when it used dino oil.
During this period, I tried Redline 10W-30. Honestly I don't think it's worth the money (at least for motor oil) since I started to get valve ticking after only 2500 miles, and I used a K&N oil filter and I had no leaks, it just broke down I guess. I was startled about it, I didn't expect that from Redline oils, but just out of my personal experience I'm sticking with Mobil 1.
I wouldn't leave the same oil in my engine for more than 4k miles, that's as far as I'd go. Even if it is safe to do so, I wouldn't do it, not the way I drive, I'd rather keep nice and fresh oil in there.

 

You guys who are changing out your synthetic oil in shorter intervals (5K or less) are wasting your money (not to mention still viable oil) unless you drive it like a taxi or police car. Change the filter instead.

 

Older sythetic oils used to be incompatible with dino oil. Modern day formulations have no problem being mixed with dino oil.

 

Mobil on their site says that dino and synthetic are totally compatible. If you're switching to a syn there is no reason to dump it out super early and put new synthetic in.

My last oil change for my 97 was at 7200 miles or so on both the mobil 1 and the filter. The oil was nice looking even after all those miles, and continues to have a nice color to it now. The myth of the 3000 has been dispelled so many times that it's barely even worth addressing the issue anymore. 3000 is overkill, no ifs ands or buts. It simply is. You won't even find a car manufacturer now that recommends a 3000 oil change except in the most extreme conditions. Our cars reco every 3750 in extreme, or 7500 in more casual. My dad's Jag x-type has an even longer interval than that. He's following the factory spec and I believe he said that it calls for a change every year or 10k miles - whichever is first.

If those cars have problems, it's not from failing to change the oil every 3000 miles. There are only three groups who call for the 3k oil change now:

1) Quick lube places
2) Oil manufacturers
3) Old school mechanics who are still preaching the same crap they were 30 years ago