07 Nissan Xterra 4400 on oil - pennzoil platinum 5w30

[skiller1nc]

Oil is cheap and engines are expensive. If your not willing to try Euro 0W40 or the Euro 5W40 route -- start accepting that changing the oil every 5K is more beneficial to your engine. JavierH19 posted a good link for good oil at a great price. Buy 2 jugs and get it shipped FREE!!!

What exactly is so good about euro 0w-40. I just picked up some of that from M1.

 

[Needleman]

This is my daily, has 179k miles. gets about 80% city and 20% highway miles. I drive it hard. I've always done 10k oil changes with pennzoil platinum or ultra platinum looks like I have been using plat high milage - just whichever I grabbed bc they look similar. I keep up with all maintenance and overall I've not had any issues. No oil burning or anything to note. valve covers are starting to seep so I may get to look underneath and see how the levels of varnish or sludge are when I do decide to replace them. Recently I've been working on my other car (2002 avalon) at trying to clean up some sludge and varnish on it with hpl and frequent oil changes so I decided at this point in its life the xterra may benefit from some 5k oil changes. Thus why I sent this UOA for the 4400 mile oil.


main concern is why that TBN is so low after only 4400 miles and that I still think iron/lead/tin are higher than I would like. I know its only 2 UOAs so not much to see trend wise and on the 4400 mile UOA the wear metals are about half which makes sense for the oil interval being half as long. overall though what do you all think?

View attachment 227098
View attachment 227099

I would recommend another check at 4400. I think you might have a coolant leak. Pressure test of the system would be a good start. Also check the overflow for bubbles.

 

[Snagglefoot]

Your Fe is fine IMO. Your bearings (Tin) are showing some minor wear which is fine at your mileage & use style. You could try 5w-40 from this point on & continue 10k intervals so long as the tests show okay.

I agree with this. The presence of lead suggests some bearing wear. Moving to a higher viscosity with this amount of miles is reasonable. I use a 5w40 in my LS engine with over 260,000 miles.

 

[Snagglefoot]

They still use lead in bearings, although there are some efforts to move beyond it.

 

[skiller1nc]

I would recommend another check at 4400. I think you might have a coolant leak. Pressure test of the system would be a good start. Also check the overflow for bubbles.

Yeah Blackstone noted the sodium on the first uoa and mentioned it could be a coolant leak. However I haven't noticed any drop in coolant level. Like I haven't had to top it off since I replaced the radiator like 8 years ago. So if it is leaking it's a tiny tiny amount

 

[addyguy]

Fe, Pb, and Si are high - abrasive wear to many engine parts going on. I’d go with a thicker oil and shorter intervals to get it reduced.