Posted by Banditfarmer on February 17, 2014 at 09:22:39 from (65.27.225.54):
In Reply to: Re: shell rotella oil posted by Dale in Nw Wa on February 16, 2014 at 17:51:15:
Big difference in the tolerances on a 98 model to a mid 60s model diesel engine so different oils specks are needed. Lets face it the new and newer diesels need the lighter thinner 15w40 like Rotella and it may work perfectly in theses engines with tighter tollerances, But in older (50s to 70s) diesels ware the tollerances were looser to start with and have over 3000 hours on the original engine (not rebuilt) they need the older heavy oils used then they were built. Its like the IH #1 30w and JDs 30w is now a lot thinner than it was 15 years ago, This is dew to the new engines needing thinner oils.
I know most of you out there have old jugs of new oil in the shop on the shelf unopened and if you check it and compare it to a new oil of the same weight you can see the difference in the pour and feel the difference when you rub between your fingers. The old is thicker and feels slicker. Sounds dumb but it is. New engine new oils, Old engines need the old style oils simple as that. Bandit
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