Synthetic Oil

[BailOut]

I'm not saying that TSB doesn't exist by any means but no one ever provided the text of it or even the reference number of it, and I can't find anything on it myself. Without it we have no idea what the reasoning was, when the option applies, if it's valid for all regions and temperature patterns, etc.

As such sticking with 5W-30 is a safe bet and covers a huge temperature range. This is important to me because between where I live and work there is a 4,500ft elevation difference. In the Winter my car can experience temperatures as low as 14F with a wind chill of -20F and in the Summer it can experience temperatures as high as 100F. Because this is a high desert just our night and day delta can be 40F+ (i.e. 49F at night and 89F during the day), and the delta between my home and work can be as much as 30F over a 40 minute commute.

Besides, just switching to synthetic vs. standard oil will net you the most MPG gain. You won't see as much performance or MPG difference between different synthetics like 5W-30, 0W-20 and 5W-20.


Edit: Additionally, the person that was most adamant about that TSB was also the most adamant about a 5,000 mile drain interval. This shows an utter lack of eduction concerning modern synthetics which are commonly good for 7,500 miles, with some going as far as 15,000. This makes any information on this subject from that person suspect.