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Discussion Starter #1
On my first oil change (Spec V), I didn't know what oil to use, so I called the service department of the dealership where I purchased my car (Empire Nissan in Ontario, CA), and they told me to use 5W-30. Ever since then I've been using 5W-30 for all of my oil changes. Now, 15,500 miles later on Mobil 1, I come across a few posts and notice that everyone I read about is using 10W-30. Should I be using 10W or is my 5W safe?? Also, since I don't know much about it, what's the difference between the 10W and 5W??

Thanks,
Mark.
 

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El Burro
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the 10w and 5w means the viscosity of the oil when its cold.

I used to use 10w30 in the summer and 5w30 in the winter, but now I just switched to 5w30 year round. You shouldn't have the problem of using it year round because you're in cali. Oh and I use mobile1 synthetic.
 

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Discussion Starter #3
Thanks, your input is greatly appreciated. Any other comments, anybody?

Thanks,
Mark.
 

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Depends on
1)how hard you run your engine.
2)How cold doesn't Victorville get an night in the winter? and do you park outside

If you don't run your engine super hard all the time 5W30 and even 0W30 is fine and you will get more power since the oil is less viscous. If you run your engine hard that 10W30 is more like it or even 15W30..the thicker oil will give better protection and lubrication.

For temps, if it gets cold in Victorville (desert nights get COLD) and you park outside, then stay w/ the 5W30 so the oil doens't get too thick when you go to start the car.

That's about it
 

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pio!pio! said:
For temps, if it gets cold in Victorville (desert nights get COLD) and you park outside, then stay w/ the 5W30 so the oil doens't get too thick when you go to start the car.

That's about it
What do you consider cold? Below or near freezing? What if it is near freezing but rarely below (maybe 2-3 weeks per year) in the winter? What happens if the oil gets thick?
 

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El Burro
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If the oil gets thick yuor engine is going to have a hard time turning over when cold and proper lubrication won't be available until the oil warms up which could lead to engine wear.
 

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well if it gets near freezing at night and you park outside..during that season you should use 5W30...You know..if you're not road racing or anything, just run 5W30 all year round :)
 

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Using 5w20 for prolonged periods might not be a good idea. That is a low-viscosity oil mainly used by manufacturers (Ford and Honda as far as I know) for fuel economy purposes, since the low viscosity lessens losses due to friction. However, the engine must be designed to run on that type of oil from the beginning, since they must have very small tolerances, so that the thin oil doesn't just drain from between the pistons and cylinder walls.
I would recommend that you do NOT run 5W20 unless you have a newer Ford or Honda that calls for it.
 
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