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Originally Posted by stubbornmike
thunderbolt gave some good info, how ever having 275000 + miles isnt 20-50 to thick of oil. During cold start up the oil is very THICK and giving more of a dry start than a 10-40. I know you want thick oil so u dont burn it. I think id rather protect my engine rather than worring about losing oil.
although are close to a rebuild anyways...
good luck pal!
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I missed the 20-50 part. I definatley wouldn't run 20-50 in it. You are going to do more harm than good with that thick of oil. If it is your rod bearings you will actually ruin them faster with the 20-50 because on intitial start up it doesn't flow well. I wouldn't run anything thicker than 10-40 and if it uses that much oil then it is time to rbuild or replace the entire engine.