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Posted: 8/11/2005 8:06:16 AM EDT
Hello I just purchased a used vehicle and I have no idea what brand oil is in the car. It's still a smooth honey color so its still good to go. The car needs about 1 to 2 quarts more oil in it and I happen to have some Castrol GTX laying around in the correct weight.

So do you think it would be wise to add 2 quarts of Castrol to the mystery oil already in the vehicle or would it be better for me to go get an oil change and know whats inside my engine?

Thanks! Just trying to save some money.
Link Posted: 8/11/2005 8:09:44 AM EDT
[Last Edit: 8/11/2005 8:10:36 AM EDT by WildBoar]
When I buy a used car, I flush the ATF, change filter and refil with good ATF. I also change the oil right away too. Better safe than sorry. This will save you lots of money later.


PS what kind of vehicle?
Link Posted: 8/11/2005 8:11:10 AM EDT
2005 Chevy Malibu with 29k on it.
Link Posted: 8/11/2005 8:11:40 AM EDT
No problem, its better than to be without oil.
Link Posted: 8/11/2005 8:13:18 AM EDT
[Last Edit: 8/11/2005 8:13:41 AM EDT by WildBoar]

Originally Posted By Knife_Sniper:
2005 Chevy Malibu with 29k on it.




I would then just top off the oil and change the filter if it looks good.

I would still do the ATF though. its about that time anyway. 29k? may as well do it now.
Link Posted: 8/11/2005 8:13:38 AM EDT
Mixing oils are alright.
Never mix coolants!!!
Link Posted: 8/11/2005 8:14:31 AM EDT
Change it and know what oil is in the motor.
Link Posted: 8/11/2005 8:14:56 AM EDT

Originally Posted By Silver_Surfer:
Mixing oils are alright.
Never mix coolants!!!



+1
Link Posted: 8/11/2005 8:21:07 AM EDT
[Last Edit: 8/11/2005 8:21:29 AM EDT by Torf]
What is wrong with mixing coolants?

I topped off my Coolant reservoir last month.
Link Posted: 8/11/2005 8:25:14 AM EDT

Originally Posted By Torf:
What is wrong with mixing coolants?

I topped off my Coolant reservoir last month.



Depends on the make.
Link Posted: 8/11/2005 8:44:37 AM EDT

Originally Posted By WildBoar:

Originally Posted By Torf:
What is wrong with mixing coolants?

I topped off my Coolant reservoir last month.



Depends on the make.



I added a mixture of Peak and water. I don't know what was in there before.
Link Posted: 8/11/2005 8:48:51 AM EDT

Originally Posted By WildBoar:

Originally Posted By Knife_Sniper:
2005 Chevy Malibu with 29k on it.




I would then just top off the oil and change the filter if it looks good.

I would still do the ATF though. its about that time anyway. 29k? may as well do it now.



Huh?

Did you mean the air filter?
Link Posted: 8/11/2005 8:51:13 AM EDT
You can mix and match just about any kind of auto oil.
I never change the ATF, just top off if neccessary. Back in the day that was bad news. Now they change ALL of the oil (pump, ect.) from what I hear. I'm still not doing it.
Link Posted: 8/11/2005 8:52:53 AM EDT

Originally Posted By HELOBRAVO:
You can mix and match just about any kind of auto oil.
I never change the ATF, just top off if neccessary. Back in the day that was bad news. Now they change ALL of the oil (pump, ect.) from what I hear. I'm still not doing it.



Remind me to never ever buy a used car from you.

I change my ATF oil and filter every 25K.

Link Posted: 8/11/2005 9:00:07 AM EDT
[Last Edit: 8/11/2005 9:00:44 AM EDT by kbi]

mixing coolants?
.
.

When you mix coolants like GM dex cool/FORD specialty orange coolant with Generic green antifreeze they'll cake up(brown crap like mud) over time and block cool the coolant flow causeing the vehicle to over heat.

Get a power flush done if your not shure of what's in it.
Link Posted: 8/11/2005 11:21:19 AM EDT
I believe you should NOT mix oils if ione is SYNTHETIC and one is REGULAR.

I am not a mechanic nor did I stay at Holiday Inn last night.
Link Posted: 8/11/2005 11:23:23 AM EDT

Originally Posted By mcnielsen:
I believe you should NOT mix oils if ione is SYNTHETIC and one is REGULAR.

I am not a mechanic nor did I stay at Holiday Inn last night.



Pretty sure you don't want to mix different types of oils, such as synthetic and standard oil.

Different brands though, can be mixed. If you need to add some, just try to keep it the same viscosity.
Link Posted: 8/11/2005 11:36:06 AM EDT
Don't be cheap. Change the oil. The extra 4 dollars you would save aren't worth the risk.
Link Posted: 8/11/2005 11:37:54 AM EDT
I think a better question would be:

If the oil appears to be new (ie; the people you just bought the car from just changed the oil before you bought the car), why is it 2 quarts low?

As a general rule, you can mix brand names of oil, but it's not a good idea to mix different viscosities of oil. In other words, don't put 10W40 in if you had 5W30 in it already.
Link Posted: 8/11/2005 11:39:06 AM EDT

Originally Posted By purplecheese:

Originally Posted By mcnielsen:
I believe you should NOT mix oils if ione is SYNTHETIC and one is REGULAR.

I am not a mechanic nor did I stay at Holiday Inn last night.



Pretty sure you don't want to mix different types of oils, such as synthetic and standard oil.

Different brands though, can be mixed. If you need to add some, just try to keep it the same viscosity.



Never heard of sythetic blends?
Link Posted: 8/11/2005 11:41:32 AM EDT

Originally Posted By mcnielsen:
I believe you should NOT mix oils if ione is SYNTHETIC and one is REGULAR.

I am not a mechanic nor did I stay at Holiday Inn last night.



You can mix synthetic and regular all day long.
Link Posted: 8/11/2005 11:42:15 AM EDT
[Last Edit: 8/11/2005 11:43:21 AM EDT by WildBoar]

Originally Posted By AeroE:

Originally Posted By WildBoar:

Originally Posted By Knife_Sniper:
2005 Chevy Malibu with 29k on it.




I would then just top off the oil and change the filter if it looks good.

I would still do the ATF though. its about that time anyway. 29k? may as well do it now.



Huh?

Did you mean the air filter?



oil filter. unless they have a decent one in there. Most have crappy filters. But since you mentioned it, do the air filter too.
Link Posted: 8/11/2005 11:46:00 AM EDT

Originally Posted By WildBoar:

Originally Posted By mcnielsen:
I believe you should NOT mix oils if ione is SYNTHETIC and one is REGULAR.

I am not a mechanic nor did I stay at Holiday Inn last night.



You can mix synthetic and regular all day long.



My car uses ONLY synthetic. My understanding is you do not want to put regular in it. Of course, an engineering and 2 years of German are required to change the oil in my vehicle...
Link Posted: 8/11/2005 11:48:41 AM EDT

Originally Posted By mcnielsen:

Originally Posted By WildBoar:

Originally Posted By mcnielsen:
I believe you should NOT mix oils if ione is SYNTHETIC and one is REGULAR.

I am not a mechanic nor did I stay at Holiday Inn last night.



You can mix synthetic and regular all day long.



My car uses ONLY synthetic. My understanding is you do not want to put regular in it. Of course, an engineering and 2 years of German are required to change the oil in my vehicle...



My understanding is that you can't use regular oil for a long time then switch to synthetic due to seals and degradation.
Link Posted: 8/11/2005 11:50:19 AM EDT

Originally Posted By kbi:

mixing coolants?
.
.

When you mix coolants like GM dex cool/FORD specialty orange coolant with Generic green antifreeze they'll cake up(brown crap like mud) over time and block cool the coolant flow causeing the vehicle to over heat.

Get a power flush done if your not shure of what's in it.


Oh, terrific.
Link Posted: 8/11/2005 11:51:20 AM EDT
[Last Edit: 8/11/2005 11:53:39 AM EDT by WildBoar]

Originally Posted By phatmax:

Originally Posted By mcnielsen:

Originally Posted By WildBoar:

Originally Posted By mcnielsen:
I believe you should NOT mix oils if ione is SYNTHETIC and one is REGULAR.

I am not a mechanic nor did I stay at Holiday Inn last night.



You can mix synthetic and regular all day long.



My car uses ONLY synthetic. My understanding is you do not want to put regular in it. Of course, an engineering and 2 years of German are required to change the oil in my vehicle...



My understanding is that you can't use regular oil for a long time then switch to synthetic due to seals and degradation.



Thats untrue. You can use synth in any age engine anytime. I switched in my van at 90k switched in my pathfnder at 65k, we did my brothers 145k hyndai. Not a leak problem anywhere.
Link Posted: 8/11/2005 12:11:19 PM EDT
If you can afford the car, you can afford to take good care of it...


I work on gearing and lubrication applications for a living and here is my .02$


Don't mix lubricants...(some manufacturers use additives that may not mix well)

Change the oil and filter.

Be sure to install the lube recommended by the manufacturer's owner's manual.

(Take climate and season into consideration)

ATF doesn't last forever. Have it serviced by a qualified mechanic and you will have a long and happy relationship with your new baby.
Link Posted: 8/11/2005 2:39:51 PM EDT

Originally Posted By WildBoar:

Originally Posted By AeroE:

Originally Posted By WildBoar:

Originally Posted By Knife_Sniper:
2005 Chevy Malibu with 29k on it.




I would then just top off the oil and change the filter if it looks good.

I would still do the ATF though. its about that time anyway. 29k? may as well do it now.



Huh?

Did you mean the air filter?



oil filter. unless they have a decent one in there. Most have crappy filters. But since you mentioned it, do the air filter too.



Okay. You may as well change the oil at that point.
Link Posted: 8/11/2005 2:47:06 PM EDT
Lots of bad info in this thread.

bobistheoilguy.com
Link Posted: 8/11/2005 2:50:07 PM EDT
ATF = Automatic Transmission Fluid?
I'm not good with mechnical stuff
Link Posted: 8/11/2005 2:57:58 PM EDT
won't hurt anything.
Link Posted: 8/11/2005 7:52:43 PM EDT
I wouldn't worry to much about mixing brands. If you're a little low, I'd just change it and start using your favorite oil from now on. I'd be more concerned about mixing types, 10W30, W20 or whatever.

Just change it.
Link Posted: 8/11/2005 9:42:58 PM EDT
If you buy a used car, might as well just change all the fluids right after your purchase. Spending $100-$150 isn't a whole lot, especially for the piece of mind you get.

Change your filters too. Make sure your tires are inflated properly, and make sure the grease fittings are topped off.

Have a trusted and qualified mechanic do a good visual inspection as well.

Link Posted: 8/11/2005 9:46:54 PM EDT
Here is the PDF file The Oil Bible everything and anything you wanted to know about oils but were afraid to ask or too dumb to figure out.
Link Posted: 8/11/2005 9:46:59 PM EDT

Originally Posted By Knife_Sniper:
2005 Chevy Malibu with 29k on it.




2005, 29K and it's a quart or two down?

Top it off so you'll be OK to get to the lube shop of auto parts dept. for an oil change.
Link Posted: 8/12/2005 6:15:39 AM EDT

Originally Posted By ComputerGuy:
Lots of bad info in this thread.

bobistheoilguy.com



Care to elborate on this?
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