If you want to flush out an old engine, use HIGH DETERGENT MIXED FLEET Diesel oil which has ZDDP in & use the double sized Ford Filter or similar Nissan & Datsun filters. I've never used anything BUT this combo.
Look for oil that can be use in Volvo TD100 & TD120 pushrod engines. These are 10L & 12L Turbo Diesel with the same style cam & lifters as B20.
In the 1980's and early '90's I used Shell Rimula-X 15W-40 religiouly because they released advertising which specifically stated: 'MEETS & PASSES VOLVO CAM AND TAPPET WEAR TEST'
Your B230 does not have this cam arrangement, nor does it deliever the BMEP of any decent B18B.
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