Here are the results of my "5w20 Experiment" using Pennzoil PureBase 5w20 in my 1999 Chrysler 300M. The engine is Chrysler's all aluminum 3.5 High Output V6, SOHC 24V. It is rated at 253 HP at 6500 RPM and spec'd by Chrysler to run 10w30 oil. The manual states that 5w30 is permitted at temps below zero only.
This oil was installed on February 19 and was drained on June 24. During February and early March the car saw several cold start mornings in the lower 20s and during the months of May and June routinely saw daytime temps in the mid to upper 90s. I made about half a dozen trips to Charlotte (150 miles round trip) on 90+ degree days at Interstate speeds of 70-75 mph.
This UOA speaks for itself. This oil gave a stellar performance in my engine. Wear metals across the board were down. TBN was still strong, and the only complaint I would have is the viscosity, which finished at ~7.25 cSt.
In comparing the 5w20 to the other oils I've tested, the most direct comparison to make would be to the Mobil 1 from last year. That oil was in the car for approximately the same time and mileage, and during the same time of the year. Look at the difference in the wear metals. (To be fair, however, the winter of 2003 was MUCH colder than this winter was. I saw several single digit starts and the car had more short run trips than this winter.)
Terry Dyson will be doing the full analysis for me, but here are the numbers:
This oil was installed on February 19 and was drained on June 24. During February and early March the car saw several cold start mornings in the lower 20s and during the months of May and June routinely saw daytime temps in the mid to upper 90s. I made about half a dozen trips to Charlotte (150 miles round trip) on 90+ degree days at Interstate speeds of 70-75 mph.
This UOA speaks for itself. This oil gave a stellar performance in my engine. Wear metals across the board were down. TBN was still strong, and the only complaint I would have is the viscosity, which finished at ~7.25 cSt.
In comparing the 5w20 to the other oils I've tested, the most direct comparison to make would be to the Mobil 1 from last year. That oil was in the car for approximately the same time and mileage, and during the same time of the year. Look at the difference in the wear metals. (To be fair, however, the winter of 2003 was MUCH colder than this winter was. I saw several single digit starts and the car had more short run trips than this winter.)
Terry Dyson will be doing the full analysis for me, but here are the numbers: