Well its that time again for me her in Southern Cali-e and I've been thinking about changing my oil weight since it never snows out here.
Anyways I'm currently using 10W30, but sinceI never have to worry about the freezing point. I want, or would like to get the thickest oil, without hurting the oil pump or starving the motor during start-up.
Is 10W40 good enough or 20W50 pushing it, or what?
What's wrong with 10-30? If your oil pressure is ok and your not using any why change. If you really want to change go to a better oil like Mobil 1 10-30.
Well i'm not going to Full Syn. or even partal, I'm looking for oil to give me better protection when my engine gets hot!!! (as in the desert) As oil heats up it starts to break-down, thats why its better to have thicker oil protects better. The down side to having thicker oil is that when it cold, thicker can hurt your engine during start-up. Also too thick of oil can make your oil pump wear pre-mature
From working in a Jeep Dealership for 5 years and a Dodge for another 1, I would say stick with 10w30. That's what is recommened from factory. I wouldn't see a reason to have to go to a heavier weight. 10w30 is a good standard. And with the heat, I wouldn't be opposed to running Mobil 1. I've run it in all of my vehicles. It's supposed to stand up to heat and not break down like conventional oils do. Don't get all caught up in the hype that if you go to Synth, you can't go back cuz you can. Try it, if you don't like it, go back.
I know a lot of people who run 20w-50 without problems. I've run it a few times but it was a synth. blend. During start up my rpms don't shoot up like normal but it runs fine. Oil pressure is higher especially at start up.
I'm running 15w-40 right now so my oil pressure stays higher and shuts my valvetrain noise up. I can't figure it out but as long as my oil pressure stays up then it shuts up. I would've gone back to the 20w stuff but I'm in WV and it will be getting real cold soon.
Mobil 1 10w30, period. Probably opening a can of worms (usually does on all the other gearhead sites), but there's nothing like full synthetic. It's engineered to be better than dino. I've run Mobil 1 in all my vehicles since purchase (including the used ones) and never had *any* engine related mechanical problems. All have gone 150K+. Current XJ purchased at 89K 4 years ago and is at 180K with no problems and still getting good mileage. If heat is your concern, upgrade your cooling system.