Just did the oil change for two m54b30 its been a year they hit a little over 7k in that span.
Moving from Euro Castrol 5w30 (experience was fine really needed to change at about 6k)
Now I'm using Euro 5w40
Quaker State and Valvoline...the engines love it! Again this year shooting for a year or 7.5k whichever comes first...monitoring the oils staying power.

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