Quote:
Originally Posted by Phil@rise
"Second, the only way to check the condition of oil is to perform a Used Oil Analysis, not by looking at it. I bet if you did one, the analysis will say your oil will have plenty of life left at 5,000km."
Ohh jeeze just cus the oil has plenty of life left in it at 5000km's of use doesn't mean the motor does.
That's the point I'm trying to make.
When doing a visual inspection of the oil and filter you are looking for contaminants indicative of engine wear that could lead to premature failure obviously the oil still has a usable service life at 5000km's.
So do an oil change at 5000km intervals and catch that cam wearing out early before it takes out the whole motor cus you were a lazy cheap dumbass and went 10000km's between oil changes.
Get the point I'm trying to make.
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You might think I'm trolling you but I'm actually having a serious discussion.
If the oil has plenty of usable life at 5,000km (thus doing it's job) why would the cam be wearing out early to the point of seeing chunks of cam in the oil?
Wear metals are on the order of microns, when the oil is doing it's job, which a Used Oil Analyses can check. Ie, checking Iron levels in parts per million. You can't use your eyes to see this.
If you are concerned about inspecting the cam's in the car the most effective way is to simply open up the head and look at them.
Here's some valvegear photos of a K20A3 head at 176,000km running 12,000km intervals with conventional non-synthetic oil. (Halvoline 5w20). No issues what so ever. Spotless engine.
The owner determined this oil interval via UOA he performed, and he's found a combination and interval that's been working well for him. Looks like it could serve him another 176,000km easily.
Here's the UOA data.
Valve gear pics:
The point you were trying to make is essentially invalid.
If you love your car, you're better off doing a UOA and interpreting the results, rather than spending more money changing the oil unnecessarily. Physically looking at the oil is a terrible way of inspecting the engine. In fact, it doesn't really tell you anything.