Originally Posted by dave1251
Originally Posted by OilUzer
Originally Posted by Garak
5w-30 should still be permissible in the manual
That's right! Sometimes they hide that detail a little. i.e. the big chart shows 0Wx20 over all temp ranges. However the "thicker oil" recommendation is in writing so some (thinies) will miss that detail but thickies can easily find it
imho, no truck should ever run with 0Wx20 unless you are going to the Mall with it
How accurate is your opinion? Your data and observations should be interesting.
I actually dont have any specific data or observation that I can point to ... Also know few who use 0Wx20 in their trucks with no oil related issues. I also had 0Wx20 in my truck (free dealer oil changes) ...
However based on what I've read on the internet
and basically my own research, I've come to the conclusion and opinion that thicker (relative term) oil can be more suitable for most applications. Neither oil will blow up your engine
Also all my cars recommending 0Wx20 and 5Wx20, allow thicker oils. My 5Wx20 car has big charts showing 5Wx20, 5Wx30 and 10Wx30 ... and all are ok to use but it recommends 5Wx20 all over including the oil cap.
My 0Wx20 truck iirc, has only one chart showing 0Wx20 but in writing it says higher viscosity oil is more suitable for high speed and/or high load or something to that effect! It does not specify 5Wx30 or 10Wx30 or 10Wx40, etc. Just says higher viscosity ...
also not that I care, but in general, my opinion is not violating any manufacturing recommendations either!
That should keep the "go by the spec." group happy