I thought I'd check my oil today and after 2200 miles, my oil is pretty dirty. It's about the color of this: http://users.rcn.com/giant.interport.../SDLBROWN.html

Does that look a little dirty for 2200 miles? I remember my past few cars having almost clear clean oil up to the 2nd or 3rd change.

Should I think about changing before 3750 miles?

 

I changed mine around then, just incase anything was floating around after the break in period

 

I read the manual and it says specifically that there is no need to chage oil before 3500 miles.

2004 6MT Sedan / Desert Platinum / Willow / Sunroof

 

How about the color? Does that look a little dirtier to anyone than you had on yours? Might that be a sign of a problem?

Am I overreacting? :-)

 

Yup. Your fine

Clint (THX723)

 

The color of oil is not an indication of its effectiveness, when I change out my Mobil1 it's extremely dark, almost black, yet the labs always state that the oil is still good.


<font color=red>chinee</font color=red>
03.5 G35s

 

The color of oil is not an indication of its effectiveness, when I change out my Mobil1 it's extremely dark, almost black, yet the labs always state that the oil is still good, and has useful life left.


<font color=red>chinee</font color=red>
03.5 G35s

 

Depends on the sizes of the dirt particles.
Oil analysis doesn't measure particles as to size.
Experiment just change the filter if the oil cleans up some in 50 miles you know!

The G35 filters are tiny and have a limited hold capacity, this is the limiting factor not the oil stability.
Why Nissan warns for longest engine life change every 90 days. What they are saying is if you want the engine to perform well at 200,000 miles follow this interval.

Those that are leasing or care nothing for future owners can get by with 6 month [7500] changes.

"A cold start can also be a dirty start, because of the oil pressure-release valve in your oil filter. If the oil pressure is too high (say, if the oil filter is clogged up, or you have thick oil), this valve opens, and unfiltered oil enters the oil circuit of your engine. The crankshaft bearings usually get their oil directly from the filter, and so they usually suffer first. "
http://www.baldwinfilter.com/engineer/pdf/89-5r.pdf
http://www.websorcerer.com/GeekOut/
http://www.baldwinfilter.com/engineer/95_11.html

A 25 micron filter will only filter 0.001" and the G35 bearing clearances mean you need to filter to 8-10 microns or better.
Compared to some domestic which may have 50-60 micron bearing clearances.
http://www.shoclub.com/lubrication-o...n-oilpart6.htm

Every time you exceed 3,000 rpm the oil pressure rises to the bypass point and unfiltered oil get circulated, as the filter gets dirty the rpm bypass point gets lower and lower.

People that do lots of high rpm cruising, run into this problem in coolish temperatures.

 

Ive changed oil in ever car I have ever owned at 3,000 mile .You dont have to worry about the color of it

Couldnt afford it when young...gonna play when Im old

 

don't worry, the first tank of oil they gave you special chemical that fills up all the small gaps in your engine
just donk' rave your engine over 3500rpm then you should be fine before 3750

 

Rankine,

Special chemical. That's a good one.

Can I get some more of that chemical so I can fix the gaps caused by my crappy intake?

I go down to ask my black beauty...
She is GONE!!!! Probably went downtown to score some X!!

I will give her much water when she returns.

And take away her remote garage door controller privileges for 150,000 miles.





2004 G35C 6MT Black. Killer.

 

Dirty looking oil does not mean its not working. Oil becomes dirty after only 500 miles. That means its doing its job.

2004 Infiniti G35S, 6MT, Premium, Sport, DP
Mods: JDM Clears, 20% tint, Z-tube, K&N Drop In
Track: 14.32 at 98.79 mph 2.2032 60ft

 

The true result of the very light tension rings and floating liners is rearing its ugly head.......as is the abnormally tiny oil filter. Some new thinking has entered Japan.

Easy to bump up power if you don't care about oil and oil burning.........the dirt can only come from combustion chambers. Assuming you don't use some aftermarket air filter and it still has to get by the rings.

Have seen some newish engines that seem to treat the oil as if they already had 200,000 miles on them. But this method does reduce friction tremendously and allow a cheap and dirty extra 10,15, even 20 HP Boost at no manufacturing cost.

Unfortunately we won't know if I'm right for another 3-4 years.