Hi everyone a few weeks ago I bought a new to me 2007 dodge ram 1500 with the 3.7L v6. I changed the oil i used qsad 5w-30. However on the oil cap it showed 5w-20. In my owners manual yes says 5w-20.But some of the auto part stores say I should use the 5w-30 Which was recommended by Oreilly auto. checked at pennzoil .com and valvoline.com they say 5w-30. I googled this found an old thread on here years ago molar was wrong misprint in the owners manual 30 weight should be used.I'm confused.So what weight am I supposed to use? Yes here in the desert it's 100 so I'm not sure but 30 weight could be ok for the summer? I hope someone has some info on this and set me straight.
The 3.7 was originally specified for 5w-30. I used it in my '04 Dodge Ram and currently use it in the wife's '08 Liberty. Back spec occurred some time later. Since you're in AZ, I'd think you could even use a 10w-30 year 'round.
And? The OP is in Tucson which is still in the USA. 99.9% of American citizens don't get Celsius. 0 = 32, 100 = 212, who knows what 35 is? When the US officially goes to C then we learn it, otherwise we do F.
Just a different way of looking at it, is all. IMO the US should have followed through the changeover that started in the 70s....we are overdue in joining everyone else in the world*.
To go C to F, double it, take off 10% and add 32. So 35°C = 70-7+32 = 95°F.
For those like me, who don’t have the math gene, an easy ballpark way is to just double the C, and add 30. So 12C would round out to 12 +12=24, then 24+30= 54* for going back down, subtract 30 from current F temp, then 1/2 that result. works pretty good for poor mans math.
That's the quick and dirty way...pretty good but gets progressively inaccurate the further you move away from center.....
*(well, everyone except for a couple Caribbean countries and Sierra Leone
Correction: SL went metric in 2011. It's Burma and Liberia. Also Great Britain, which uses metric, except for distance which is still miles - since they invented miles I guess)https://www.vox.com/2015/2/16/8031177/america-fahrenheit