I run mobil1 but my local small engine place that installs and services Generac, Kohler and Briggs swears by Rotella straight 30 weight.
I run penzoil ultra platinum. I’ll spend the extra money to know that I might get a few more hours out of my gen.
Luckily modern oils are developed with this in mind. Costco/walmart/amazon oil is made by the same company, Warren oil. I think most people consider penzoil ultra platinum as one of the best.
I use Pennzoil Ultra Platinum 5w-30. It’s hasn’t failed me yet and I’ve done multiple track days
Pennzoil ultra platinum 5w-30 in my 2016. Will use it in wife's 2025 when warranty is done.
I have a baleno woth 130k mileage and I have been using shell 10w 40 and the performance and fuel avg is great
I use rotella 15w-40, high zinc content but my engine also has 230k miles
I use one oil - shell rotella. It goes in my XRL my 4.0 Jeep and my 7.3IDI diesel ????
I always used gn4 but switched to rotella t6 15w40 cheaper, full synthetic. it can handle the heat alittle better and I like the shift quality over gn4. Walmart has it for cheap
I did use the Shell T6 Rotella 5W40 for 4 OCI's and then got a misfire issue. When my mechanic was going thru the possible symptoms he asked what oil i used. When i told him it's a full synthetic deisel truck oil he shook his head and said that not a good idea. Too thick, and that could have an impact.
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