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Re: Engine lubrication [message #357679 is a reply to message #355936]

Wed, 12 August 2020 21:47

Carl S.

Messages: 4186
Registered: January 2009
Location: Tucson, AZ.

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Senior Member

The machine shop in Tucson that did the work on my 455 (Larry's engine and Marine) said that, due to the large size of the main journals on the 455 crankshaft, they set the clearances for 20W50 oil. I'm not totally clear on the reason why, but it has to do with getting enough oil in those large diameter bearings. I broke it in with 15W40 Rotella, but imediately switched to Valvoline 20W50. I would be comfortable going back to the 15W40, but think maybe the 20W50 is a better choice for me in Southern AZ, where I am often driving the coach in 100 plus degree temps, at least during the Summer.

Carl Stouffer '75 ex Palm Beach Tucson, AZ. Chuck Aulgur Reaction Arm Disc Brakes, Quadrabags, 3.70 LSD final drive, Lenzi knuckles/hubs, Dodge Truck 16" X 8" front wheels, Rear American Eagles, Solar battery charging. GMCSJ and GMCMI member

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[Message index]

		Engine lubrication By: tgeiger on Sat, 13 June 2020 05:35
		Re: Engine lubrication By: 94nubble on Sat, 13 June 2020 06:59
		Re: [GMCnet] Engine lubrication By: powwerjon on Sat, 13 June 2020 06:35
		Re: [GMCnet] Engine lubrication By: 94nubble on Sat, 13 June 2020 07:33
		Re: [GMCnet] Engine lubrication By: jimk on Sat, 13 June 2020 19:51
		Re: Engine lubrication By: jhbridges on Sat, 13 June 2020 07:35
		Re: Engine lubrication By: tgeiger on Sat, 13 June 2020 07:55
		Re: [GMCnet] Engine lubrication By: James Hupy on Sat, 13 June 2020 08:50
		Re: [GMCnet] Engine lubrication By: jimk on Sat, 13 June 2020 09:39
		Re: Engine lubrication By: JohnL455 on Sat, 13 June 2020 12:02
		Re: [GMCnet] Engine lubrication By: James Hupy on Sat, 13 June 2020 12:16
		Re: [GMCnet] Engine lubrication By: jimk on Sat, 13 June 2020 12:57
		Re: Engine lubrication By: rickmike on Tue, 11 August 2020 20:50
		Re: Engine lubrication By: tgeiger on Sat, 13 June 2020 18:04
		Re: Engine lubrication By: JohnL455 on Sat, 13 June 2020 18:34
		Re: Engine lubrication By: Larry on Sat, 13 June 2020 19:14
		Re: [GMCnet] Engine lubrication By: James Hupy on Sat, 13 June 2020 19:47
		Re: Engine lubrication By: Husker92592 on Sat, 20 June 2020 11:10
		Re: Engine lubrication By: Matt Colie on Sat, 20 June 2020 12:17
		Re: Engine lubrication By: Husker92592 on Sun, 21 June 2020 00:46
		Re: Engine lubrication By: Carl S. on Wed, 12 August 2020 21:47
		Re: Engine lubrication By: rickmike on Thu, 13 August 2020 23:45
		Re: [GMCnet] Engine lubrication By: jimk on Sat, 20 June 2020 12:05
		Re: Engine lubrication By: jhbridges on Sat, 20 June 2020 14:03
		Re: Engine lubrication By: roy1 on Fri, 04 December 2020 11:29
		Re: Engine lubrication By: mghamms on Fri, 04 December 2020 11:39
		Re: Engine lubrication By: jhbridges on Wed, 12 August 2020 07:29

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