Oil light comes on at low rpm

wrote:

Running a thicker oil (in order to investigate the cause of low oil pressure) is, by far, much less risky than the "open heart surgery" that is involved in removing the cylinder-head.
 Consider that, at the very least, you will need to replace the head gasket and oil-orifice o-ring.
And, while you are in there, you might as well lap the valve seats and replace the valve-stem seals, which will require re-setting valve clearances.
A couple of new, (thinner) shims will almost certainly be required after lapping the valves.
Also, while  open, you could measure the clearance of the camshaft bearing journals with "plastigauge"
plastigauge.co.uk/about/how-plastigauge-works/  

A lot to consider....

PS
While the statement "a loss of power" using thicker oil is technically 100٪ true, I don't think your (or my) butt-dyno would be able to detect it... in my opinion.

 

wrote:

Why isn't anyone talking about this? 
Steve

kzrider.com/forum/2-engine/606916-cam-problem#770846

wrote:

Yes for a start and check the pressure relief valve. When cold the spring could work as intended but when hot it could be weaker.
Steve