I dont risk using any oil/lube/grease other than the branded receommended stuff. Same applies to car oil, only use exactly what’s recommended, why guess what’s best/better? Some recent posts on here gave the impression that Fox forks are too high maintenance and the rest are low maintenance in comparison but this post blows that theory out the window a bit.
Rock Shox have the advantage of having a proper separate oil and dust seals, there are 4 seal ‘edges’ between the inside and the outside. Fox combine this into one seal, with only two wiper edges. Rock Shox will go alot longer than fox without running dry but both types of fork run a semi-bath with just 10-20ml of oil in the lowers compared to Marzocchi with 150-220ml. Hence both fox and rs will always require more maintenance than Marzocchi and also explains part of the weight differences.