Which engine oil is recommended the straight six Bristol engines?
Dave Dale and John Lawley both place great faith in Castrol Classic XL 20/50.
John Lawley, BODA technical officer, has more recently been using another oil also developed especially for classic cars. If you go to http://www.commaoil.co.uk/productsguide you will see 3 versions: a combined winter/summer oil, a dedicated winter oil and a dedicated summer oil. I use the combined version and have been very satisfied with it.
The only reason for the change is that my current motor factor does not stock the Castrol oil only obtaining it to order. However, they stock the Comma oil so I thought I would give it a try.