Yes, sorry I forgot to mention that (I always change the filter when doing an oil change).

Yes, I did :)

Edited by JezUK on 23/07/2021 at 17:33

Was the dip stick up to the full mark Before you drained it and at the full mark after you started it up to fill the filter? Annoying but nothing to worry about. If you put flush through it all that would have drained out Car sounds like a good old work horse worth giving it a treat!

I let it drain overnight at least, longer if I don't need the car.

Pointless exercise, may actually cause more damage than good as it coukd take significantly longer to prime the pump and circulate the oil to everywhere. In the case of the Ford Ranger with 3.2l engine it would be disastrous

4wheeldriveguide.com/ford-ranger-3-2-oil-pump-prim.../

Do you want a turbo spinning up without oil pressure/flow in its bearing for 5 seconds?

Do you want a hydraulic chain tensioner to be drained down when starting?

Unless you can physically turn the engine upside down and shake it about, you're just not going to shift the last 0.5 litres so the 50cc you drain overnight is insignificant. And you might find airborne dust has found its way into the open sump plug/ filler cap.

Re the above "do you wants?" I'd be out of luck if I did, since I dont have a Ford Ranger, turbo or hydraulic chain tensioner, nor do I particularly want any of them.

Re airborne dust working its way against gravity into the engine. I plug the drain port loosely with paper towel. I do this mostly for a wicking effect since the drain port is poorly designed, but it may defeat anti-gravity dust demons too.

Re pump-priming, this gets into a controversial area, since oil pumps are often (and have been recently described on here), as non-return devices. It also gets perilously close to the/a core question in the long unresolved thin v. thick oil debate, but 4WIW, after an oil change I take the plugs out and spin the engine over on the starter for a bit.

Possibly another pointless exercise, but its only once every half decade.

Re you're just not going to shift the last (whatever arbitrary number you like) its my oil change and I'll try if I want to.

Your figures seem to check out. Explanation could be build up of sludge in the engine over the years that the flush did not remove or volume stayed in the engine and did not drain

Yeh, thats better.

A few years ago, having noticed ferrous metal settling on the dipstick and confirmed it using a magnetic pickup tool down the dipstick hole, I took my oil pump apart to see if it was the source.

Seemed OK, but the pump pedestal had casting voids in it which were completely full of semi-solid sludge.

I dunno how general such voids are in engines (this in a 1986 Charade, sort of) but their existence would limit what can be achieved with a flush, unless it was run for much longer than is normally advised.