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ajm55 · 07-07-2021, 08:18 AM

A mate has recently had 2 M engines replaced by BMW - one on his F10 M5 and the other on his X5M. Both were replaced because of damaged bores.

When asked about the likely cause of the damage, he speculated that driving the car predominantly in efficient mode over many years might be the culprit. When asked how so, he explained that in efficient mode (as opposed to SportPlus), certain cylinders shut off unless you go WOT - or so he was told by someone at BMW.

I'm curious to know whether (a) it is correct that when efficient mode is engaged, certain cylinders shut off, and, if so (b) whether that could result in damage to the bores.

With the new motors, he invariably engages SportPlus immediately after start-up.

Anyone know the answers?

07-07-2021, 08:18 AM	#1
ajm55 Private First Class 55 Rep 178 Posts Drives: f10 m5 Join Date: Dec 2019 Location: south africa iTrader: (0)	scorched bores and efficient mode A mate has recently had 2 M engines replaced by BMW - one on his F10 M5 and the other on his X5M. Both were replaced because of damaged bores. When asked about the likely cause of the damage, he speculated that driving the car predominantly in efficient mode over many years might be the culprit. When asked how so, he explained that in efficient mode (as opposed to SportPlus), certain cylinders shut off unless you go WOT - or so he was told by someone at BMW. I'm curious to know whether (a) it is correct that when efficient mode is engaged, certain cylinders shut off, and, if so (b) whether that could result in damage to the bores. With the new motors, he invariably engages SportPlus immediately after start-up. Anyone know the answers?
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