Quote Originally Posted by geezer101 View Post
I wouldn't be game to add diesel fuel even at that low mix ratio (says the guy pouring half a litre of it into engine oil and driving it for a day afterwards...) Might have been fine with pre-emissions or way older cars
Isn't that your very own method of oil flushing Geez? interwebs say .5 qt = .47L
Geezer101 says
O.k. this is how I perform my engine flushes -

#1. Dump the current oil and drain the filter out as much as possible, then reinstall [the old filter]

#2. Add 2 litres of fresh oil and add 0.5 litres of diesel fuel, then drive it for the rest of the day (guarantee this will not harm your engine and you should notice lifter noise will reduce within 5-10 mins of driving)

#3. Leave it overnight, start it again in the morning and bring it up to normal operating temperature (leaving it overnight will allow the diesel to continue to break up gunk in places like the lifters - and the flush oil will look filthy...)

#4. Dump the flush oil and replace the filter with a new unit, then fill to normal capacity (approx 3.6 litres - if you know your engine is tired now would be the best time to go up to a heavier weight oil)

I've been doing this to mine and wifey's car (both of which are Hyundais and are notorious for noisy hydraulics) and not only has significantly quietened them down but has extended the life of the oil and has had no adverse issues.