Originally Posted by 2legit2quit
I don't see why that first valve cover would be so horrible, I mean I've got 227, xxx miles on my Prelude and the valve cover looks nothing like that.
BTW, dino has always been used in it.
Heres an example of a valve cover ran with dyno and one that was ran with synthetic oil.
Your results may vary.
The post that I got the photos from.
Originally Posted by Gerhard from PO
Below (EDITORS NOTE, ABOVE) is a valve cover that used dino oil for 70k (ish) and my valve cover that has 120k on it. (Mine is the clean one... it's NEVER been cleaned.)
This is not a fluke... this is VERY common with the H22 engines.
I recently had to do the oil pan gasket and the oil pan was also PERFECTLY CLEAN.
There is a 50k mile difference between the two engines and my H22A4 is flawlessly clean... where the dino 70k engine has all of that gum and varnish.
I've seen several other H22A4's with exactly the same comparision and contrast.
Synthetic lubes work as advertised.
I've used primarily Mobil 1 and AMSOIL. There is less than 10k on the car with dino lubes.