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Old 17-03-18, 08:58 PM   #1
logfloga
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Default ruston hornsby AP

I was wondering what oil I should use for my Ruston Hornsby AP I have been told it should be a mono but what grade, and whats good please.
Dave.
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Old 17-03-18, 09:20 PM   #2
martinpaff
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Bottom line Dave; it doesn't matter! In terms of quality, just about anything available now will be better than the best when your engine was new. In terms of weight, anything between SAE 30 and 50. I use a cheap 10/40, but if you really want to spend too much money buy Morris straight 30.

MP
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Old 18-03-18, 07:57 PM   #3
logfloga
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Default Ruston Hornsby

Thank you Martin I have been told to use a mono grade oil because multi's will eat into the white metal bearings, don't know if this is correct but caution tells me to go for a mono, therefore I will aim at the 30 grade that you speak of.
Many thanks for the reply
Dave.
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Old 18-03-18, 08:25 PM   #4
martinpaff
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What you have been told is complete garbage - think carefully before listening to that fool again!

There is an issue with Hypoid Extreme Pressure (EP) oil and bronze, but this has nothing whatsoever to do with multigrade and white metal.

MP
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Old 18-03-18, 09:07 PM   #5
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I have also used just about any type of engine oil in my Rustons too without issue.

Dan.
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Old 18-03-18, 10:50 PM   #6
PuttPuttBang
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I use Halfords 10W 40 in my Rustons, it looks a nice golden colour in the oilers, and the drip rate is easy to control in warm weather. (remember "warm weather" ?) Basically anything we have now is as good or better than what was available in the 1920s.

I have used 0W 40 mobil 1 on occasion, simply because I keep some in the garage but it's really too runny except maybe in winter.
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Old 18-03-18, 11:31 PM   #7
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I use what's in the can. Depending on what car needs oil or if its the lawn mower it could be anything from sae 30 to 5/50!
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