I've seen this before and even used 10w30 in my older model vehicles, but with my Trailblazer being newish, and Govnt. Motors specifying 5w30, then I will stick to that.just my :m2:I'll take the other side of this argument and say to just stick with what you have. The first number is the viscosity rating at cold temperatures - which you never experience - and the second is at operating conditions. The further the numbers are apart, the less "oil" is in a quart and the more "modifiers" are present to make the oil act differently at differing temperatures. If cold starts are not an issue - read really cold like you only experience in northern climates - then you do not require 5w-30. In fact, a straight 30 weight oil would probably be more appropriate.
Will it really make a difference one way or the other - no.
True, but the same dealer who handles my warranty work routinely uses 10w-30 in my Trailblazer.I've seen this before and even used 10w30 in my older model vehicles, but with my Trailblazer being newish, and Govnt. Motors specifying 5w30, then I will stick to that.just my :m2:
Kind of off topic here but - California temps are "pretty steady"? 30F - 115F is steady? Even though the o/p is in San Diego, we still have a WIDE variety of temps. When our weather forecasters do the weather, they have 4 different temps. One for the coast, one for inland, one for mountains and one for deserts.10w30 is absolutely fine for your vehicle. I cannot think of an HM oil that is not a syn blend. They add esters (the synthetic part) for mild cleaning and seal swell. Stick with an HM oil: Maxlife at WalMart is cheap, and a very good oil. There is no NEED for a synthetic in this vehicle.. all GM OLM's are calibrated for conventional oils. The only thing a synthetic brings to the party is more tolerance at temperature extremes, (especially cold) and extended drain intervals. In California, where the temps are pretty steady, there would be no noticable advantage in a 5-30 vs. a 10-30, or in a full synthetic. There are a whole bunch of vehicles getting 200k on bulk conventional oil from Iffy Lubes to ignore that today's regular oils are up to the job.
+30 to +115?? Wimps! We routinely get -20 Celsius in winter to +30 Celsius in summer, with occasional dips to -40 (C or F; at -40 it's the same thing) and rises to +40 C.Kind of off topic here but - California temps are "pretty steady"? 30F - 115F is steady?