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Re: What oil are you using in an older flat tappet motor?
I use 10w-30 Walmart high mileage synthetic oil with a mobile-1 filter. I feel like the synthetic helps with less oil leaks and my engine has at least 164,000. I just use it as my junk yard hauler but have put a lot of miles to WY and Denver.
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79 Chevy 2wd BIG10 350 TH400
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