I have a 2006 Phaeton W12 that's been giving me some persistent trouble with cam adjuster performance. Everything is fine when it's cold, but after it's well warmed-up and oil temperature reaches about 180F or more, they start having trouble performing consistently. One of them was replaced, along with its housing and control solenoid, and that didn't seem to cure the problem. As of late it's making some rapping sounds at RPM*0.5 that I really don't care for, also only when the oil is hot.
Oil pressure test results, OAT 57F. Current fill is dealer installed Castrol Edge Professional SLX 5w40, plus a quart of MMO added for troubleshooting. OCI is 10K with about 8K on this fill.
Cold start, idle: 68 PSI
Cold start, 1500 RPM: 70 PSI
Cold start, 2500 RPM: 72 PSI
Oil 150F, idle: 21 PSI (meh)
Oil 150F, 1500 RPM: 54 PSI
Oil 150F, 2500 RPM: 69 PSI
Oil 210F, idle: 12 PSI (very meh)
Oil 210F, 1500 RPM: 35 PSI
Oil 210F, 2500 RPM: 64 PSI
The pump consistently bypasses above 70PSI. VW lists a pressure spec of 3.0 to 4.5 bar at 2000 RPM with oil temperature of 80C. I didn't have that spec in-hand at the time I tested, but reading between some lines I suspect I'm okay or close to it. VW does not directly list an idle RPM spec, but 12PSI seems kind of sad. Almost all my troubles are at low RPM.
The top end of the engine is beautiful. No build-up or even varnish. My next task is to pull the oil pan off and see what there is to see. I **may** be able to pull the oil pump and inspect... repair manual says I can't without pulling the engine, but I don't see what's stopping me. I can definitely pull the pickup tube. It's extremely unlikely I can get access to main or rod bearings without dropping the engine, which isn't possible in the immediate future.
When I refill, what do you think I should refill with? It calls for a 5w40 oil meeting VW 502.00. My current thinking is Redline 0w40 or even 5w40. In addition to meeting spec, they have unusually high HTHS and kinematic viscosity @ 100C. Both of those things appeal to me right now.
Jason
Oil pressure test results, OAT 57F. Current fill is dealer installed Castrol Edge Professional SLX 5w40, plus a quart of MMO added for troubleshooting. OCI is 10K with about 8K on this fill.
Cold start, idle: 68 PSI
Cold start, 1500 RPM: 70 PSI
Cold start, 2500 RPM: 72 PSI
Oil 150F, idle: 21 PSI (meh)
Oil 150F, 1500 RPM: 54 PSI
Oil 150F, 2500 RPM: 69 PSI
Oil 210F, idle: 12 PSI (very meh)
Oil 210F, 1500 RPM: 35 PSI
Oil 210F, 2500 RPM: 64 PSI
The pump consistently bypasses above 70PSI. VW lists a pressure spec of 3.0 to 4.5 bar at 2000 RPM with oil temperature of 80C. I didn't have that spec in-hand at the time I tested, but reading between some lines I suspect I'm okay or close to it. VW does not directly list an idle RPM spec, but 12PSI seems kind of sad. Almost all my troubles are at low RPM.
The top end of the engine is beautiful. No build-up or even varnish. My next task is to pull the oil pan off and see what there is to see. I **may** be able to pull the oil pump and inspect... repair manual says I can't without pulling the engine, but I don't see what's stopping me. I can definitely pull the pickup tube. It's extremely unlikely I can get access to main or rod bearings without dropping the engine, which isn't possible in the immediate future.
When I refill, what do you think I should refill with? It calls for a 5w40 oil meeting VW 502.00. My current thinking is Redline 0w40 or even 5w40. In addition to meeting spec, they have unusually high HTHS and kinematic viscosity @ 100C. Both of those things appeal to me right now.
Jason