old oil

[dcblackbird]

so its just about time to change my oil. last time i bought 5 quarts of mobil 1 and the car only uses 4.5 so i have a 1/2 quart left i was wondering if i could just buy a 4quart jug and use the old 1/2 quart or is it bad cuz i already oppened it? cuz they say change your oil every 3k miles or 3 months so i was wondering if its too old to use?

[doobiess]

if your saying you wanna use your 1/2 quart you had left from the last time you changed the oil .. thats perfectly fine.. wont harm anything even if its been opened

[bballr4567]

As long as you shake it up before you used it the first time and shake it up this time you will be fine.

[coupe]

Ive never seen a 4 quart jug

You using mobil1 full synthetic? If so, changing your oil every 3 months is a waiste.

[tenspeed]

Originally posted by dcblackbird
cuz they say change your oil every 3k miles or 3 months so i was wondering if its too old to use?

The thing that "wears out" is the additives and that happens in a engine. The oil has been in the ground for a million years so a couple of months in a bottle isn't doing much.

I would say to change every 3K for city driving only. I'm out in the country and change every 5K. Synthetic can go longer.

3 months is way too early, I change around once a year if the car didn't have the miles.

[Matt95GT]

It's fine to use the leftovers remaining in the last jug. I always do, or save for topping off between changes. (when my Nissan QR25DE occasionally eats oil :mad: )

Originally posted by coupe
Ive never seen a 4 quart jug



I have, but it was dino oil... forget what brand. It was annoying having to buy a supplementary quart for that extra half qt.

[coupe]

Originally posted by Matt95GT
It's fine to use the leftovers remaining in the last jug. I always do, or save for topping off between changes. (when my Nissan QR25DE occasionally eats oil :mad: )



I have, but it was dino oil... forget what brand. It was annoying having to buy a supplementary quart for that extra half qt.


This is how i do it.

Buy a 5 quart jug (never seen any jugs less than that other than 1 quart bottles)

Change oil

Save 1/2 quart for next oil change

Next oil change buy 4 1 quart bottles

Change oil with left over 1/2 quart and the 4 new 1 quart bottles

Next oil change start the process over again

[daman]

Originally posted by dcblackbird
so its just about time to change my oil. last time i bought 5 quarts of mobil 1 and the car only uses 4.5 so i have a 1/2 quart left i was wondering if i could just buy a 4quart jug and use the old 1/2 quart or is it bad cuz i already oppened it? cuz they say change your oil every 3k miles or 3 months so i was wondering if its too old to use?
Use it and sleep good at night....

oh and using 5 qt's will hurt nothing....your pan will hold
it just fine.

[Houndawg]

Use a Mobile 1 M1-201 filter and it will actually need that extra half quart.

[MantaGreen97]

I think oil does go bad over time as additives and stuff start to separate or breakdown with time, even without being in the engine. Yes oil has been in the ground for millions of years, but it's not like they just extract it from the ground pour it in bottles and put it on the shelf, LOL.

That said I believe it would take several years for anything "bad" to happen to most motor oil--even after 2-3 years it would probably still be okay to use.

I wouldn't worry about oil that's a few months old, it'll be perfectly fine.