Mobil 1 0W-20, 8,057 mi 2008 Mazda CX-9 3.7 L

[Scott P]

I just got my report from Blackstone for our CX-9. The manual calls for 7,500 mile intervals and since the vehicle is still under warranty, I am going to stick with that interval. I used Mobil 1 0W-20, not the 5W-20 that the report indicates. I also used a Mobil 1 filter. I also did add 3 oz of Auto-Rx at teh start of the interval. This is the second time in a row that Blackstone has indicated the wrong oil. I need to contact them to get the report corrected.

The CX-9 sees about 50 miles per day of commuting. I wasn't paying attention, so she went a couple weeks over the 7,500 mile interval. It doesn't look like any harm was done. It looks like I should be pretty comfortable with this oil under this interval. I currently have some Mobil 1 0W-20 Advanced Fuel Economy in there now because of the rebate. I'm sure it will fare as well.

Any thoughts or concerns?

 

[daman]

Nice solid 20w still,little bit of fuel not bad,almost 3 TBN yet,how many miles on this engine?

 

[Leo]

Says 14k on the report?

 

[daman]

K missed that,still breaking in then, sure.

 

[Cutehumor]

IMHO, I would not use the Auto-rx in a 2008 model with Mobil 1

 

[buster]

Keep going with it and establish a trend. Also, I would not use Auto Rx with Mobil 1. In fact, don't use any additives. All the additives you need are in the oil. Not necessary.

 

[daman]

Originally Posted By: Cutehumor
IMHO, I would not use the Auto-rx in a 2008 model with Mobil 1

x2..shouldn't need it.

 

[Scott P]

I tossed in the Auto-Rx to help carry any break in particles that may be remaining. It was a maintenance dose. I don't have anything in there for this interval yet.

 

[chevrofreak]

I say use the Auto RX. Mobil 1 needs all the help it can get.

 

[addyguy]

Need to do some shorter runs with dino oil to flush out break in material. You're not doing this engine any favours.

 

[badtlc]

AutoRX will definitely clean areas M1 cannot. Keep using it with confidence. Too many people believe oils really can do everything.

 

[buster]

Why would anyone run RX with an oil that contains polar base oils and in a vehicle that only has 14,000 miles on it? Makes no sense.

 

[Bill in Utah]

Note to self;

Don't do extended OCIs on new engines....

If it was me, I'd forget the AutoRX and extended OCIs.

Do a few 5k OCIs with any oil that is rated for it then a 7,500 mile run and see what that UOA looks like.

I would not be happy with this UOA personally. While your engine is prob fine I would rather see a young engine doing better.

Thanks for the post!

Bill

 

[ZZman]

I agree with Bill.......

 

[badtlc]

Originally Posted By: buster
Why would anyone run RX with an oil that contains polar base oils and in a vehicle that only has 14,000 miles on it? Makes no sense.


IF there is grp V base oil in that mobil, that is only a huge deal when running clean/rinse. Maintenance dose isn't an issue for the most part.

 

[daman]

Originally Posted By: buster
Why would anyone run RX with an oil that contains polar base oils and in a vehicle that only has 14,000 miles on it? Makes no sense.

I agree with Buster,come on only 14,000 miles!!

 

[saaber1]

Originally Posted By: ZZman
I agree with Bill.......


+1

 

[Amkeer]

I do not understand the Auto-RX in this engine? Just use the Mobil 1.

 

[Steve S]

The engine is really new and the numbers look fine . you could extend the oil change interval to 10,000 miles no problem that is a benefit of syn oil. Warranty compliance is a good idea .

 

[friendly_jacek]

I hate to say it, but this is not your usual brake-in I'm used to see in Japanese motors. Fe is higher than previous UOA and steady at 7ppm/1000miles. Is this engine known to produce higher Fe?