Has anyone tried this oil for an b8speed gearbox? It’s cheaper than my engine oil (£5/lit). there are more than one listening at this price on the Bay. Like This. ZF lifeguard 8 is expensive at around £200 considering a used low mileage working gearbox is about £400 delivered or an overhaul kit costs £200. I have used egr cleaner, brake cleaner, engine flush, etc. from this brand and I was happy with the quality.