Hi all,

I need a bit of advice on what to do with the oil in my ls1. Its got about 20k on it since being rebuilt, having been run on Castrol Magnatec 10-40 before and after the rebuild. IJ was very impressed with the condition of the internals given it had about 260k on it, which was a big tick for the magnatec.

Now that its rebuilt with a mild cam, it has that sewing machine noise coming from the valves which does my head in a bit, particularly when the windows are down. Will switching to the Castrol Edge 10-60 (or anything else?) quiet down the valve noise, and if so do I need to take any precautions when switching from a semi to full synthetic??

Cheers,

Jarrod