Mobil 1 0W-30 Advanced Fuel Economy

[Ryland]

You want to use the thinest oil that is thick enough to keep the oil pressure up, without an oil pressure gauge that is hard to tell, but I figure it's time to go to a thicker oil when my car starts to burn much more then a quart of oil between changes, I've only used 20W 50 in one car and that was because it burned a quart of oil every 300 miles.
So I would say that unless you are more the a quart low when you go to change the oil then stick with your normal oil, if you are half a quart or less low then try something thiner.

Originally Posted by Domman56

i'm wondering what is the lowest viscosity i should try on my car

[Domman56]

Sweet my car never runs more than a half a quart low if that so I'll try 10w/30 on the next oil change and see how that goes

[Christ]

If you're not burning alot between changes, it's probably the cold weight that's affecting you, and you'll burn a little bit until the engine warms up, characterized by smoking until the engine is warm.

If you're burning more than, say 1.5 or 2qt in 3-5000 miles, you're going to need a thicker warm weight, as well.

IOW - if you're only burning very little, you could still stand to go down a weight in the cold end. If you're burning alot, you'll want a thicker oil. Then again, if you're burning alot, and you intend to keep your vehicle, it's ALWAYS cheaper to fix the problem than to keep buying band-aids for it.