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Old 11-28-2021, 04:54 PM   #18
Ski in NC
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City: Wilmington, NC
Vessel Name: Louisa
Vessel Model: Custom Built 38
Join Date: Jan 2014
Posts: 6,194
I too drive a diesel Jetta, yr 2001, 1.9ltr, 288k miles. Rotella T6 5-40 for last 200k miles. No issues.

Don't get too hung up with viscosity. Oil viscosity varies a LOT with temperature, whether a single grade or multi-vis. Between the two types of oil, the multi-vis changes less, but between cold and hot engine the vis difference is HUGE.

Don't worry about it. What ever oil you use the car will be a POS before the engine suffers a lube related failure.

I stick with T6 so the "hot" turbo does not coke the oil on hot shutdown. Original turbo still doing fine, so it is working. My Cummins 450 with water cooled turbo gets dino oil (T4).
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