Oil Analysis on my Mazdaspeed3

[Mid_Life_Crisis]

"The oil was in good shape physically and free of coolant, moisture and gas."

Why are so many of you blaming the viscosity findings on gas in the oil when the report clearly states that there was none?
I have no idea what the cause is, but read the report, because it isn't gas dilution.

 

[Super Unique]

Try shearing of the viscosity index additives, caused by running it through the turbo charger..... Simple, and normal explanation for reduced viscosity. Also accepted by most experts as normal.

 

[desperado-c]

If that's the case, that car is running dangerously lean for a turbocharged car. That looks like a decent N/A fuel curve, but not for FI. Since my gas mileage in the past few weeks of ownership has been less than stellar (about 25mpg with 80% highway driving), I'm not sure how much leaner the 08.5 is actually running. Maybe this was a factory freak.

Factory freak, mis-calibration, something. Plenty of people with 8.5's posted to say their 8.5's don't run that lean.

 

[desperado-c]

Direct injection allows a car to run significantly leaner than port injection... but that seems a little overboard. I too look forward to more dyno results.

Not that much leaner unless you're talking about stratified DI instead of homogenous. Ours is homogenous and not gonna be a lot different than regular FI.

 

[desperado-c]

I wonder why the factory would put in a 5w-20 but spec 5w-30. Without a response back from the lab I just would have thought after the oil gets used it starts to thin out and resemble a 20 weight, especially with the direct injected history of fuel dilution however minor it may be.

That was a quick email off the top of his head. Definitely not conclusive. If it's not heat shearing or fuel dilution due to the turbo, why would turbo engines generally spec w/higher viscosity than the standard 20 weight?

 

[Betelgeuse]

Try shearing of the viscosity index additives, caused by running it through the turbo charger..... Simple, and normal explanation for reduced viscosity. Also accepted by most experts as normal.

+1
I'm beginning to lean this way as well. But I heard the dyson analysis is more accurate with regards to fuel dilution than Blackstone. Again that's just through the grapevine. I plan to do one to see if the results are indeed any different.

 

[nhluhr]

did my second oil change at 7882 Tuesday. Will post the Blackstone report when they email it to me. Oil level was perfect, no odd colors or smells, and just a little dirty looking.

My subaru's oil was always black after 3000 miles.

 

[jp4130]

I remember when the MS3 first came out some of the owners manuals had been edited. At first they were printed calling for 5-20. Then they were changed to 5-30. Maybe Mazda had to mess around with 5-20 in these cars to reach corporate fuel milage targets. Then they got the car aproved and switched the reccomended oil wieght. Who knows maybe they still have to leave the factory filled with 5-20 for fuel milage targets, or possibly to allow for break in?

 

[CWPspeed3]

did my second oil change at 7882 Tuesday. Will post the Blackstone report when they email it to me. Oil level was perfect, no odd colors or smells, and just a little dirty looking.

My subaru's oil was always black after 3000 miles.

Cant wait to see how it turns out. I'm almost to the point of my second oil change waiting to see how the PP looks when it comes out.

 

[coololddude]

life is good when you have lots of time to analyse your OIL!!! WTF!!

 

[MS3-oholic]

Here is my oil analysis I had done a few weeks ago.

 

[nig3]

i use 10/40 here in hot ass houston, was even considering 20/50 soon. thicker is better for any high performing hot turbo motors and will add a margin of saftey. ive noticed in the past that using thinner oil like mobil one 5/30 and 10/30 will definatly increase oil consumption and cause turbo seals to leak sooner.

 

[MS3-oholic]

I'm moving back to Beaumont at the end of Sep. I'm getting out of the Navy. My car has never used oil, the level remains rock solid between changes. San Diego is known for it's mild climate though.

 

[strytnyne]

i use 10/40 here in hot ass houston, was even considering 20/50 soon. thicker is better for any high performing hot turbo motors and will add a margin of saftey. ive noticed in the past that using thinner oil like mobil one 5/30 and 10/30 will definatly increase oil consumption and cause turbo seals to leak sooner.

haha its not the heat its the humidity =/ sucks to live in 80-100% humidity

 

[FrequentFlyer]

Here is my oil analysis I had done a few weeks ago.

Glad to see there's no fuel dilution.

 

[MikeHTally]

I just did my first oil change too at 2170miles to Pennzoil Platinum 5w30.
Why do the comments say "..common finds in new engines such as your 4.2L."?

I was wondering about that myself. Not sure I'd trust a laboratory where they can't read. This is the second example I've seen. Wonder how often they mix up samples?

 

[nhluhr]

I was wondering about that myself. Not sure I'd trust a laboratory where they can't read. This is the second example I've seen. Wonder how often they mix up samples?

If you read the thread you will see they had made a typo. They sent me an ammended analysis report. Anyway, this is an old thread and I'm expecting my oil analysis report for the second oil change to be mailed in the next couple days.

 

[FrequentFlyer]

i use 10/40 here in hot ass houston, was even considering 20/50 soon. thicker is better for any high performing hot turbo motors and will add a margin of saftey. ive noticed in the past that using thinner oil like mobil one 5/30 and 10/30 will definatly increase oil consumption and cause turbo seals to leak sooner.

I just noticed that this info on the K04 by Neuspeed recommends 20W-50 for the summer and 10W-40 for winter. Things that make you go, "hmmmm?". Now, I think 20W-50 is a bit extreme, but 10W-40 should be a good compromise. At any rate, 5W-30 is definitely too thin:

http://www.clubb5.com/information/ko4.shtml