Ok so I usualy change my oil myself but this time i could not so i took the car to the dealer for oil change. When i was leaving i asked the service advisor what type of oil did they use, he said they use COSTCO 10w30.

So maybe this is a dumb question but i never heard of COSTCO oil, i mean i know you can go to COSTCO and purchase oil there but do they actualy have their own brand ?

I am not very happy with this as I always use reputable oil such as Mobil or Castrol, so now i have this "COSTCO" oil in my car and i'm thinking maybe i'll just get it out next week and put something else in.

Any advise or ideas ???

 

No you will be fine, yes some oils are better then others however using a "cheap" oil will not hurt the engine at all. If you dont feel comfortable just change it after 3000 miles

also check out this thread

https://my350z.com/forum/engine-and-drivetrain/253651-mobil-1-oil-users-motor-oil-discussion-thread.html

 

Royal Purple ftw

 

why? because its purple

much better oils out there

do some research, check out the Bob is the Oil Guy forums

 

Motor oil specifications are in your owners’ manual. Look for the starburst on the top of the can.

 

I use costco oil...I bought 3 cases when I got my Z...I also change oil per the owner's manual schedule. (Costco's oil is rated to the standard specified in the owner's manual) I've had no problems with it.

 

If the oil is anything like the gasoline, I wouldn't put it in my car.

Their gasoline is really bad.

 

I would not chance it.

 

What about synthetic? Especially when you get near 100K on the engine?

 

If you're NA, you really have nothing to worry about. NA motors are generally not nearly as hard on oil as FI applications. Once you have a turbo, you should get a lot more selective about the oil you're using because it's working much harder and is doing more things now. But in a NA car, it's really not getting stressed that much.

Sythetic is always good to use. It has better sheer stability, will maintain its viscosity better and has better cleaning agents inside it. You also may not have to change it as often as regular oil. The only really reliable way to know how hard your car is on oil is to send a sample out to Blackstone Labs and have it tested. It costs in the order of $30 to do it so if you're curious how the oil did, after you change it, send a sample out and have it tested.

 

id use 5w30 if you are n/a