dreamcarz06

Has anybody used the Mobil 1 0W 30? if so do yo have any complaints, or issues? Did you notice any difference in MGP or overall engine performance especially at higher RPM ?

Oil viscosity is one of those gray areas. I've done some reading on this web site: http://www.bobistheoilguy.com/motor-oil-101/

I'm considering using this in my '08 Z...looking for any yays' or nays'?

I used it in a lesser performance car with good results and slightly better MPG.

erichg1000

I run 0-30 and notice about zero difference. Slightly lower cold oil pressure which is a good thing. If 0 30 flows even a teeny bit better cold then that is a win in my book.

Six-Gun-Todd

Excellent in cooler climates....here in Michigan it's a perfect viscosity choice particularly when my oil temps rarely go above 160. Just wish mobil 1 offered the extended performance formula in the 0w30 weight.....it has a much better anti wear formula.

TARANTULA

German Castrol 0w30 oil analysis always comes back looking great.

IanM

Not really on exact topic with the thread but I do not get all this oil hype. 5w30 seems to work just fine for me... So you get 1 or 2 more PSI with a different weight... Do you really know enough about oil to know what that does once the engine is heated and running hard? I promise you outside air temperature has little or nothing to do with cylinder temp and hence has little or nothing to do with anything very close to them. Of course I agree you will see lower oil temps with colder air and that is because the vast majority of your oil is not right there near the heat... but some of it is and that is why I say stick with factory recommendations.

Of course that is 100% my opinion and not fact for sure. I have no real road race experience so maybe some of you guys do know a ton more about this than me. I on the other hand am not that into oil analysis so I stick with what I can count on.

dreamcarz06

Agreed!

dreamcarz06

Another question....

Does the Z take 8 qts exactly? Or is a bit more?

And how is that Walmart can sell a 5 qrt jug of Mobil 1 Syn for 26 bucks while everywhere else its at least 12 to 15 dollars more? This isn't some lesser formulation which a GM mechanic tried to convince me of....

jschindler

If it's a 09 or newer it takes quite a bit more - 10.5 quarts total. I'm not sure about the earlier ones - someone will know the answer and post it within a few minutes I'd bet.

As to the original question, in theory a 0-30 is a no lose proposition. But I'd be mildly concerned if it is not listed in the owners manual and you are under warranty. I'd be very hesitant to use something that is not recommended.

Mdm23

Why question factory viscosity? What's wrong with 5w-30?

jmzo6

Probably of most importance is factory warranty requirements. With all the fuss about blown engines, I'm sure the first questions will be what oil you use after does it have a custom tune. If you are in very cool environments, 0w30 would probably be ok by the factory, but find out for sure.

I was curious about the extended wear formula and wondered if there was any advantages like what you pointed out. I change when the oil life gets around 40% even though it's overkill, so not sure if the extended life is an advantage to me. Any thoughts on that?

Hib Halverson

There is no practical advantage in using a 0W30 engine oil in the LS7.

Yes, there might be a very small fuel economy improvement, but it would be so small that it would take special test procedures to measure accurately.

Unless you live in Alaska, north-central U.S., northern New England or Canada or northern New England and drive a lot in the winter, there is no durability advantage in going to a 0W30 from a 5W30.

If you do not drive your Z06 hard and you don't drive in the desert southwest, 5W30 is ok.

The best choice for any LS7 which is run hard or driven in hot weather is a 10W30.

erichg1000

0 30 and 10 30 will give exact same viscosity once at operating temperature. All I know is from bob the oil guy what he says makes sense more than anything else I have read. I suggest reading his site and making your own opinions.

erichg1000

More pressure = less oil flow and that is bad mmmk

dreamcarz06

Not questioning factory viscosity. Just asking for some opinions from LS7 owners experiences.

FNBADAZ06

Here is a VERY informative discussion on oil viscosity....member LDB is the man when it comes to discussing oil !!!

Give it a read....it's very enlightning.

http://forums.corvetteforum.com/c6-c...confusion.html

erichg1000

I disagree with him when he says 0 weight is too thin at startup. 0W30 or 5W30 is still thick at startup just like straight 30 weight is thick at startup. He says it's thinner than water but it's not I watched it pour out of the bottle and its much thicker than water. It's all about oil pressure because yeah thick oil is great for separating mechanical parts but if it's too thick to get there (not enough flow, high oil pressure) then it can't lube anything. When you have 70 psi of pressure on startup idling the oil is not flowing through small orifices fast enough since we know that as pressure decreases velocity increases

40YRW8

I have done my own oil changes since the Z was new (Jan 2007). It has always taken exactly 8 quarts. That is until last week. After draining all the oil and removing the filter, I tried something new. I jacked up the passenger side of the car about 9 inches and another 1/2 quart of old oil came out. I pre-filled the filter then added the remainder of the 8 quarts I had on hand. After a quick trip around the neighborhood, I checked the oil level and it was exactly 1/2 quart low. It appears to me that I have been leaving 1/2 quart of dirty oil in the motor every time I change oil. I waited a week and re-checked it and it was still 1/2 quart low. I topped it off with another half quart. I had the same thing happen when I changed my tranny fluid last week and got about 1/4 quart of additional dirty oil out of the tranny by jacking the front of the car up 10 inches.
Gary

erichg1000

Good tip! I'll try it. On my next change

Mopar Jimmy

Do yourself a favor and run the European Blend M1 0W40 that will give your Z more overall protection and anti wear. Its a great oil and spec'd for all European C6 Zs, and available at all the common big name auto parts stores such as Auto Zone, Pep Boys, Napa.

erikszr1