Do not be fooled by Shimano mumbo jumbo. Castrol LHM will work well. DOT fluid is an absolute no-no in mineral oil systems. Castrol LHM is certified for Citroen suspension systems that has extreme loading. It is safe for your family to cruise 120km/h on the road. Your brake system will not catastrophically fail using this oil. The key to success is finding mineral oil with the lowest cSt value. If you want the ultimate mineral oil Phillips66 X/C 5606A aviation mineral oil. This is oil used in extreme conditions, used in ballistic missiles and military aircraft. If it is good enough for stealth fighters, do you think it is good enough for your Shimis? It is also rated ultra clean grade. I believe there is a local importer of Phillips66 oils and it is even cheaper than Shimano. So tell me who is ripping us off completely.
