My 89 cabby has over 400 k on it I use some of this stuff every couple of months, a bit in the tank, a bit in the crankcase. Works wonders on the lifter tick helps tired hydraulic lifters, nearly eliminates it.
MMO is the cat's ass for fixing collapsed hydraulic lifters in the Vanagon engines. Throw a few ounces in, drive it for a 100 km or so, then do an oil change and it seems to clean the crap out and get the lifters quiet again.
Despite what people say, the manufacturer doesn't always know best. On my car, a few years into ownership people discovered the hydraulic lifters were failing when Volvo recommended 0W-30.
Hard to tell from the video but sounds like Hydraulic lifters noise. Hydraulic lifters got noisy after over revving the engine. Took car to the mechanic and he said to ignore it because it was not worth replacing/rebuilding at this point. The noise is exactly like knocking
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