Soon I'm going to be pulling out my old HS car ('77 Cutlass) that has been sitting for 10-12 years. I have started it every year or two, but it's way past it's OCI. LOL Engine still runs great. I'm just curious as to what oil you guys would run in an old engine like that? I'm thinking Mobil 1 HM 10w40....or Mobil 1 FS 5w40. Even thought about Rotella T 5w40. Back in the early 90's I used to run Castrol GTX 20w50 (I know, probably not the best choice) and also ran some Kendall 20w50. It used to have low oil pressure at idle, but I fixed that in the mid 90's with a HV oil pump. Now it has plenty of oil pressure. I am looking for a big box store oil that will clean, as I'm sure it's not the cleanest engine using the oils of the past, even though I changed the oil every 2K miles back then. I even ran AutoRX through it back in the early 2000's. The car was driven a fair amount in the 2005-2007 timeframe, but has sat a lot since then. Before I put the Pontiac 400 in my Cutlass in 1989, it was in a '73 Grand Am that my parents bought brand new. It was our family car that was used to tow our camper back in the late 70's and early 80's. My dad always did 2K OCI's. The car then sat a lot and did short trips until 1989, when the Grand Am turned into a rust bucket and my HS friend and I put it into my Cutlass that I had just bought for $300 with a blown 260. So that's how it ended up with a '73 Pontiac 400 in it.
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