I'd say the risk of old stock is low, as most dealers nowadays don't keep much more than consumables as stock, due to bean counters seeing parts on shelves as dead money.
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Prior my retirement and when I was in the earthmoving industry, our Parts Dept would get notice of updated parts (say, an oil pump) and we'd be sent the new updated oil pump in the next fortnightly Stock Order from HO.
We'd have to destroy the superceded (oil pump) by damaging it so it was not possible to use it, forward relevant photographs of the destroyed oil pump back to Head Office Parts Manager and chuck it in the bin.
It also applied to "dead" stock such as an oil/air filter which had been sitting on the shelf for a year or two due to no further sales demand. We'd get the directive from HO and so punch a screwdriver through the filter, take a photo then turf it to the bin.
The photos were 'proof' to the Tax Man that the part/s had been written off in accordance to the Tax Dept's rules.
I wonder if that process is done in the Auto Industry. If so, then I guess one can purchase new parts in full confidence that they are the latest.
When I've read guys having repeat inlet manifold failures I've often wondered if they've been given the latest updated manifolds.....
Here's what my friendly parts guy said about a Territory oil pump. Part Number is listed as FO-4R8Z 6600A. Haven't opened the box yet to see if it has the thicker impellor but I assume so
Good morning Dave, See attached quote
There was a break point on the parts around 2014 so he has quoted the later options.
Have a look & see if this is the one you are looking for. If so, he can get ex melb in a day or so
Attachment 181877