Gday Having a small issue with the wifes VX executive. Changed the rear main, sump and rocket cover seals and ever since then the oil light comes on for approx 1-2 secs at cold start up. Also has developed what sound like a noisy lifter, but not all the time. Some people tell me to put a thicker oil, im using Nulon 10w-30, but im not confident that will fix the actual problem. Will it have anything to do with the fact i cleaned the sump right out, possibly disloging some **** into the oiling system? Engine is ls1 stock as a rock, with 155k on it. Any feedback/experience greatly appreciated

did you replace the oil pick up o-ring, very common problem on ls1's