I just changed my engine oil using fully synthetic 10w30 and wonder should I continued to change my engine oil according to factory maintenance of 3750 miles or could I extend it to every 5000 miles?

 

5000 is fine.. even maybe 7500.. get 5w-30

 

5000 is pretty good. I tend to keep mine at 3000-3500 range for synthetic.

 

I would not run 7500 unless your running Amsoil, and get a Oil report to make sure everything is ok.

read https://g35driver.com/forums/engine-...ysis-info.html

 

7500 is okay with Amsoil and most others but depending on the filter you used, you may want to change it halfway.

 

blackstone labs

/thread

 

Speaking of which, at the same mileage (5k), Blackstone found that my Mobil 1 EP is doing much better than the Pennzoil Platinum i had in prior changes, and to think i had a couple of track days on the M1.

 

Mike, you referring to their 0-30? Yeah, that's supposed to be a very good version still. I don't think their 5w 30 / 40 or their 10w30/40 fares nearly as well against the others oils.

 

hmmm...so 5w30 will out last 10w30? by the way I'm using Pennzoil for the first time, I'm usually Mobil 1 kind of guy...

 

no...

 

lol. ok.

 

5w30 on both. I'm a little confused, are you referring to the Pennzoil in your comment above?

I've used Amsoil and M1 for the most part, the Pennzoil was a fluke since it was all that was available locally for a while. Now that the M1 EP is fully stocked locally i was hoping to just keep using it.

 

Oh you meant extended performance. What's that cost? More than the other Mobil 1 synthetics?

 

Yep! The price varies, the Quart's tend to run between $5.5 to $6.5, roughly the same as the standard M1 Synth. The 5qt jugs come out cheaper, but it's still rather hard to find around here

 

I used to use nothing but Mobile 1, but as of late, I'm just not a fan of Mobile 1 anymore. After discussing motor oils in a classroom with a rep from Redline, I've come to a conclusion that Mobile 1 sucks *****.

Motul > Amsoil > Castrol > Penzoil > Mobile 1