Best oil for My Slant 6

Rug_Trucker said

My Buicks............@89K my 2005 3.8 Lesabre started getting 10-30 semi synthetic Rotella presently has 259K.

My 1997 3.8 Lesabre had 150K when I bought it. Went to 10-30 Rotella. 256K on it will get many more when I get a new transmission.

Neither use oil beyond factor norm. The '97 leaks more than it burns which ain't much.

My 93 Corolla started it's diet of 10-30 Rotella @142K it made it to 264K and it T-boned a Chevy Astro van. We will never know how man miles it could go..............:rolleyes:

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Hey, use whatever you want. Hell I used Quaker State for umpteen years back in the '70's and'80's. Everyone said it was garbage and would sludge up my engine. But Quaker State sponsored my stock eliminator car. Never had a problem. But time and technology change, and I am not an expert, but Lake Speed is, so I will defer to him.
PS: I had a boss at one time. Whenever he tried to get someone to change the way they were doing something, and they said "that's the way we have always done it". He would reply "So you've been doing it wrong for X number of years, don't you think it is time to do it right"?