I cant see that the lucas is going to help because it basically thickens the oil. From what I understand this noise comes from the clogged oil holes in the lifters. The lucas probably wouldnt help keep them clean. I would just run straight synthetic oil and before each oil change I would dump in a bottle of seafoam for a while (no more than 50 miles) to get those lifters clean. Ok, maybe not every oil change, maybe every 2nd or third oil change. I work at a parts store and I tell people to stay away from Lucas oil additives until they start to burn oil due to normal wear and tear (increased clearances and slightly lower oil pressures and burning oil). I never ran it im my rodeo just because it didnt burn oil. They do now make an oil additive that is synthetic. The lucas stuff would be good for really hot climates, high performance motors and is excellent for diesels. If you read the package, if you add 1 quart to 5 quarts of 10W-30, you get 10W-40, not what these motors want. Stick with a 30 wt oil (0W-30, 5W-30, 10W-30) and you should be fine. Im not an engine expert, but the stuff I've studied in school about designing bearings has taught me to stick with the manufacturers recommended oil. Its a long and fairly complicated process to design a bearing and then the oil that it requires. The thicker oil will stick to everything better, but it won't go where its supposed to as easily. Hope this makes sense, but I might be wrong, but it makes sense me. And seems rather reasonable enough. (oh yeah, im 21 on the 21st.. yeah, its my birthday) sorry, just thought I'd throw that in.

Dan