Join Date: Dec 2009
Location: Fort Collins, CO
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Interesting stuff, thanks.
But there are some things in the post above which seem to be combined and I'm a bit confused as to the relationship between them.
Are you saying that even in a perfectly operating VQ engine, unless synthetic oils and filters are changed at intervals of less than 5K miles, the engines will create gelatin-like deposits in the oil pan?
And to clarify, did you state that this happens 5 months after the vehicle reaches 30K miles on the motor (that section is not clear to me)?
Or are you suggesting that the gelatin-like material starts to form only in engines that have an antifreeze leak?
I'm fairly sure that I'm not understanding clearly.
I've never seen the headgasket problem get into the oil or cylinders. External leaks only.
The engines Ive torn down and repaired have ranged from 1500 miles to 115,000 miles. if you change the oil every 3k/30 (5k/4mo synthetic) the inside of that engine will look brand new all the way to 100k. You can run a top-shelf premium syn like Amsoil or Shaefer 9000 to 8k/6mos with no worries.
From here, it snow balls. every 1k/1mo you add to your oil type from here starts the varnish and pudding. And it just builds. a 60k motor that has had 4k/4mo changes looks like a 30k motor that has had 7k/6 month changes. Talking conventional/blends here now. its brown, chain guides are brittle, the 'lifters' in the valve train arent shiny. I've got pictures somewhere of a 90k motor that was black inside. Totally black. That murano lost its oil pump, and the owner changed the Mobil1 every 9k or so.
One of the downsides of being a flat-rate tech is not having enough time. I wish I could go back to when I was doing 3-4 headgaskets a week and take pictures. Really document what I was seeing. The pictures are worth a million words.
But the VQ has a nice large oil fill that provides a good look. If the metal you see inside looks any thing other than a slightly golden (forgive me for crudeness, but go pee on aluminum. That is how it should look) color, consider changing the oil more often or using a higher grade. If you see any obvious dark streaks, or brown/black, clean it.
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