29-03-2022, 08:32 AM
(This post was last modified: 29-03-2022, 08:35 AM by Bob Culver.)
After it has entered the oil pump intake once, it is all second hand. The all synchro version of my 1960s modern suggested no gearbox oil changes, but did for the non synchro 1st as mine. I used to alternate the same oil and not use the 1/2 inch at bottom of container.
I dunno about latest exotic blends but I have unused containers of inexpensive new oil 30 and more years old. A distinctly fine silt forms in the bottom. This was a feature of reclaimed oil much used in the 1970s but I guess all goes through some imperfect filtering. It is well recognised that cold running degrades oil but I have read no info on the degree to which it is restored by a long hot run. It can certainly lower the oil level as all the water and petrol evaporates. Dunno about modern oils but condensation was the death of Seven main bearings.
Most Sevens burn so much, and with no filter, there is little point in exotic long life oils.
And Hugh, it is intriguing that the little bug cannot muster the nerve to cross the fence line. Like ducks with a straight hose.
I dunno about latest exotic blends but I have unused containers of inexpensive new oil 30 and more years old. A distinctly fine silt forms in the bottom. This was a feature of reclaimed oil much used in the 1970s but I guess all goes through some imperfect filtering. It is well recognised that cold running degrades oil but I have read no info on the degree to which it is restored by a long hot run. It can certainly lower the oil level as all the water and petrol evaporates. Dunno about modern oils but condensation was the death of Seven main bearings.
Most Sevens burn so much, and with no filter, there is little point in exotic long life oils.
And Hugh, it is intriguing that the little bug cannot muster the nerve to cross the fence line. Like ducks with a straight hose.