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I have just changed the oil on my 290 SP and used 75w90 GL5, as that is what my previous DP drive used. I now realise that I should have used engine oil sae30 or 40. Should I change it, or is the synthetic GL5 actually a better oil anyway and best left? Thanks
Here is a better view of the die cast impeller.
This should better explain how it mated and pinned to the driven gear.
View attachment 22128