Shuffling stuff around the house, dug out the old maintenance book for the Aussie V-8 holdens from 1968 to 1971 (homegrown 253/308, and 307, 327, 350 Chev).
Thought it might be interesting.
10W30 appears to be the "proper" grade for useage across the country.
Thought it might be interesting.
10W30 appears to be the "proper" grade for useage across the country.