Originally Posted By: Craig in Canada
In terms of "no evidence of cleaning", you said the vehicle was pretty clean to start with so I'm not sure what you're expecting to see. If it dissolves some varnish, and cleans some carbon from the rings, and there was never any sludge - what are you looking to see?
You're right, my engine was clean so I didn't really expect anything significant. I just had ordered more ARX than needed and decided that another cleaning wouldn't do any harm, especially before moving to groupIII oil. The point here is that I maybe didn't expect ARX to do anything in my clean engine, but overall I didn't expect it to cause or reveal (directly or indirectly) a problem other than potentially a leak (that again would have proved something had taken place as far as cleaning goes). So the problem is reverse: I didn't expect to get lifter noises and I got them after 1500 miles. Ok then people here suggested my filter may be clogged so I checked...and can't find any evidence of it being clogged or even dirty at all. From now on I'm trying to understand what may have happened then.
Originally Posted By: Craig in Canada
I saw you mention that right away on startup with fresh oil the noise is gone. I don't really see just what ARX could do to the viscosity which would affect it that directly. There's a huge range of oil viscosities your engine will see from the same fill between cold starts, warm starts, hot starts, long runs uphill etc... that it's hard to believe a small change from a couple of ounces of ARX would suddenly cause lifter racket. Maybe something else is going on? Maybe your oil was loaded up with something, or "worn out" from holding lots of crud in suspension?
The problem is probably not ARX+oil but ARX+oil+1500 miles. I got no noise for the first 1500 miles then it started "suddenly" (yes as if something had broken loose) and at every cold start (even not so cold, with outside temp at 20°c). Now after oil+filter change, I get no noise as far as it goes. You're right, I should have tried with just the new filter without renewing the oil but after seeing that the filter was "clean" and unclogged I thought it could come from the oil+ARX only...and it seems to be the case up to now. If the oil were loaded I should have seen something in the filter. And I don't think that oil to become problematic after 2000 miles when I had used it for 6000 miles OCI in the past without any issue. The only reasonable thought I can have is that indeed something came loose and may have been removed during the oil change. I just find it hard to believe that if anything got loose, nothing ended up in the oil filter. And anyway if indeed the theory of something getting loose and potentially prohibiting cold oil to flow up to the lifters on cold starts was correct, that would make ARX a "not so safe" metal cleaner as advertised...
I understand this issue is weird and my point is not to say whether ARX does work or not. Obviously my "clean" engine is not a good candidate to test either of those hypothesis. But my main concern with additives is first whether they're safe and this experience of hearing loud lifter noises did make me nervous. I'm now trying to understand what could have happened. I will have to see further into the rinse phase if the noise appears again as I've only fired the car 3 times since the oil change of yesterday. Hopefully some suggestion from people like you will bring much more interesting thoughts than from people acting religiously (or commercially...) in favor or against a specific product
Anyway the cleaning phase was 2000 miles instead of the recommended 2500 miles. I don't think that's too bad.
Cheers