I have been searching in vain for the sump capacity of the sierra 1.8CVH sump. Can anybody help?
Thanks
Clive

4.0 lt with filter.

Brilliant, thank you.

Many car engines are between 4 and 5 litre oil capacity. If you have (or get) a Haynes manual for the donor car it'll tell you in there, as well as the recommended oil spec.

Nick, not worth getting a manual just for the sump! I have been running 4.5L as that was to the dipstick high mark. But the dipstick came with the block, not the sump. So it occurred to me I ought to check! Seems I was about right, but I will drain and refill with 4L and re-mark the dipstick.
Btw I don't trust haynes manuals at all for specs. Too many mistakes!

If the dipstick came with the block and is the right one for that block then the min/max markings are correct for that block regardless of what sump is on there. Don't re-mark the dipstick. If 4.5L takes the oil surface to the max mark then the volume of oil that should be in there is 4.5L.

If the engine has been running fine with 4,5 l in there, that's probably the correct level
If the engine smokes a slot, then the level is to high