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Home » Public Forums » GMCnet » 455 Expected Engine Life (Assuming proper care, how many miles?)
Re: [GMCnet] 455 Expected Engine Life [message #360449 is a reply to message #360441] Tue, 01 December 2020 17:57 Go to previous messageGo to previous message
Matt Colie is currently offline  Matt Colie   Canada
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Registered: March 2007
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hertfordnc wrote on Tue, 01 December 2020 16:50
So what is normal or acceptable oil consumption for a healthy engine with a few miles on it?
David,

Jim's numbers are real good. One of the things that he did not mention is that the coach engines have higher lube oil carry-over than the passcar application. This brings us to two important things:
If the lube oil level in the pan is too high, that carryover will be increased. While this is not damaging if you do not have a catalyst or an O2 sensor, it will cause the apparent lube oil consumption to be higher than it actually is. If you fill it to the "full" mark, that top quart will be gone in 500 miles.
For proper operation and longevity, the lube oil consumption of a 455 in coach service should be in the area of 1.5~2% of fuel. That should be about a quart in 1000~1200 miles. If it is less than that, then the rings are not lubricating as well as they might.

I had a un/fortunate situation. A couple of years back,the coaches lube oil consumption suddenly increased from less than a quart in 2000 miles to more than a quart in 500. The engine was exhibiting no other issues, so I kept pouring oil in it until we got back to base. I had no history other than old faded receipts that showed engine things at about 90+K in Mexico some years before. Now the Odo was at about (1)70K. I will not go into the quality of the internal work but to say that there were issues, but the cylinder bore and primary bearing wear were not issues. Had it not been for the failure of the lands of piston #7, the engine would not have needed service for at least another 70~80K. That being the case, If you were to take good care of an Olds BB in coach service, I should think that 150~200K would be very easily achieved.

If that is not the information you hoped to get, let me know as I have more.

Matt

Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit

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