Date registered: Oct 2009
Vehicle: 2000 VW Golf Variant
Location: Leiden, Netherlands
Mentioned: 0 Post(s)
Quoted: 4 Post(s)
When the engine oil is warm, it is less viscous, that also reduces the oil pressure because of the easier flow. The viscosity rating of the oil can also affect oil pressure.
15 psi isn't that low for a warm engine at idle and within specs. The idle speed is too low when the A/C is on, normally there should be a system that increases the idle speed to prevent stalling.
If you take the engine out, you can overhaul it completely, there is almost no limit to what you can, but it depends on the size of your wallet, how long you want to own it and how many miles it has already done. Engine overhauling is done either because the engine has done a certain amount of miles (you can more or less predict when an engine is worn out) or when there is a problem.
Piston rings renewal means removing the engine head. If you have the engine head off, you can inspect the pistons and the cylinders too and measure if they are within specs or need renewal.
If the knocking is indeed a worn-out crankshaft bearing, renewing it can solve it.
Last edited by Govert70227; 07-17-2013 at 01:18 AM.