Quote:
Originally Posted by JohnM 855 T5R
A3/B4 oil should never be used unless it is also certified to conform to A3/B3 as well. As per my above post, B3 is certified for use in high performance petrol engines, B4 is certified for use in performance diesel engines. Whilst many full synthetics are certified to conform to both B3 and B4, there are some that are not. Check, check check on the can what the oil is certified to.
John
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A3 is petrol cert, B3 is an older diesel spec essentially superceded by B4 but still exists as yet for more basic oil. You wont find singular A or B specs now they are always combined as A3/B3 or most commonly A3/B4. Basically B3 is short life B4 is extended drain.
Check check check indeed fella! Please! 😉😉👍