Originally Posted By: demarpaint
Originally Posted By: volk06
Originally Posted By: demarpaint
Originally Posted By: lukejo
1995 Camry 4 cyl 5sfe. 205,000 miles.
First 100,000 miles were nearly all short trip with PYB 10w-30.
100,000-160,000 mainly short trip with M1HM 10w-30.
Then-I'm second owner. For 160k-205k, nearly all highway miles, M1HM 5w-30, then Valvoline Full Syn with Maxlife for the last 25k of it.
While it isn't terrible it does show that good synthetic oils by themselves didn't clean it up much in your case.
I'd run a short OCI or two with a dose of Kreen if it were mine.
How can you make this claim without knowing that it looked like before the started use of the synthetics? It has 200K on it, just let it go running the HM oils going forward. What good would kreen or a flush actually do in this case if it is not burning any oil and runs smooth? The answer, not much besides emotional warm fuzzy feelings.
Easy, if the oil was doing a bang up job cleaning then the engine should look cleaner than that after the amount of time the OP was using synthetic oil. We also know that heavy varnish may lead to problems later on, [it has been discussed time and time again here] so why not try and clean it up after actually seeing what it looks like?
Once again just assumptions. Still a moot point if you have no reference point to what it looked like when it began. The oils could be doing a bang up job, you have no way of knowing without a starting data point. 40K on synthetic oils, after being run for almost 20 years on dino, you have no idea how much it could have actually reduced. Why not clean it up with an aggressive additive? Because it really doesn't need it. With the oils he is using, the varnish will most likely not get any worse and/or improve.