Originally Posted by YOTA LOVER
When my 95.5 hit over 200k I started running a higher viscosity synth in the summer, and the engine responded with smoother idle and better mpg's. I initiated this when the truck started knocking hard the winter before. Figured she was getting long in the tooth.
When this Taco gets to 150k I'll probably do the same. Might only be two or three oil changes of a heavier weight, but it'll keep all of the moving parts protected.
Same reason I used to run the 15w40 Rotella in the '99, then. It had that damn 3.4 rattle on startup when I bought it. Started running the Rotella and never heard it again. No problems with too much oil pressure, lower MPG's or slow turnover in the winter, so I figured she liked the thicker stuff. It only had mid 150's when I bought it, but when I sold it she had over 185k and idled as smooth as butter with that Rotella in it.