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If I had to choose one of your choices than I would go with Mobil1 5w-40 T&SUV. On the other hand, I too have an '05 vq35 engine in an Altima and I ran factory fill for 1500 miles, then switched to Mobil1 5w-30. It has 21K miles now and I just did my last oil change last week at 5,000 miles with...

Keep reading posts from this web site and you'll soon kick yourself for not doing 5k+ OCI's a long time ago. I was a 3K lifer until coming here. Now I do Mobil1 5w-30 year round with 5K OCI's and don't even break a sweat. Good luck with the nightmares...

FYI: I just had my 4.6 Explorer fluids flushed / filled. The person who did it is some kind of Certified Tech and works for a Ford dealership and also a friend. We were talking about oils and I explained the raging debates that goes on the web regarding 4.6's and 5w-20 / 5w-30 / 10w-30 oils. He...

I used to do 3k OCI with Mobil1 until finding this board about a year ago. I now do 5K OCI's and love it.

I find this topic interesting. I have an uncle who is some kind of Ford master mechanic and is the head mechanic for one of the MA state police barraks. A couple years ago he started talking like he had been brainwashed by Ford to only use 5w-20 oil. He says that's all they use for any ford...

I've noticed a difference in lower noise levels since they went from SL to SM grade oil. I think that happened some time last year ? Maybe there won't be so many complaints about noise with the new Mobil's ??

I apologise if this has all ready been discussed but... Has anyone noticed the new Mobil1 SM being any quieter than the older Mobil1 SL ? I have a ford with the 4.6 and a Nissan with the 3.5 and both were a little noisy (ticking sounds coming from engine area). I always use Mobil1 5w-30 since...

I know you are certain about the location but I can't help but tell you I had a similar experience and it ended up being the heat shield on the cat converter. It would only rattle on decceleration and after the car warmed up it would go away. sorry if that sounds stupid but just wanted to cover...

Here's some real world advice: I too have an '05 3.5 Altima... first oil change at 1200miles with Mobil1 5w30, second at 3000miles with Mobil1 5w-30, 3rd oil change at 6000miles with mobil1 5w-30, remaining OCI are at 4k - 5k mile intervals. I have also done this with an '02 Ford Explorer 4.6V8...