Quote Originally Posted by Martin in Bellevue
A good start with your new 540, might be to check for oil pump bolts floating about the oil pan. Maybe after draining the oil, you could fish in a magnet on a telescopic stick & see if any bolts are down. I wouldn't deviate too far from the mobil 0-40 oil; those lifters should like it.
on the 540 and take a peek at those oil pump bolts rather than chance on a magnet finding them...then you could look to see if any are loose even if they haven't fallen out yet... And i would stick to mobil 0-40 year round also and my ambients in tucson are much higher in the summer than Oregon...I ran the bmw 5w30 in my sloppy old m30 motor without any problems in ambients as high as 127f in Bullhead city before... Lifters? i haven't seen any lifters in a long time...