Better ?
Explain
A3/B3 and A3/B4 are thicker than A5/B5.
But more importantly, you should be running what your owner's manual suggests: it is one or the other, not both.
In general A3/B3 is a higher HT/HS viscosity than A5/B5, because A5/B5 has to meet fuel economy requirements and A3/B3 does not.
Is there a reason why you're looking at ACEA oils? Are you going to be running extended oil change intervals?My truck is a 2003 with 186k, GM6094 spec 5w-30 or 10w-30 if in warmer climates.
Yeah, GM6094 is an outdated spec, if I'm not mistaken. Likely retired when Dexos was introduced. My guess is any 5w-30 oil would be fine, if you don't run extended oil change intervals. And if you do, I would think any Dexos1 gen2 approved oil would work fine, as would ACEA A5/B5 oil.I think Im ok running most any 5w-30 or 10w-30 will meet those obsolete specs.
Just looking at M1 HM 5w-30 & 10W-30.Is there a reason why you're looking at ACEA oils? Are you going to be running extended oil change intervals?
Yeah, GM6094 is an outdated spec, if I'm not mistaken. Likely retired when Dexos was introduced. My guess is any 5w-30 oil would be fine, if you don't run extended oil change intervals. And if you do, I would think any Dexos1 gen2 approved oil would work fine, as would ACEA A5/B5 oil.
My guess is you'll be fine with either. The 5W-30 might give you marginally better fuel economy. Not sure if you'd actually notice it.Just looking at M1 HM 5w-30 & 10W-30.
5w 30 is A5/B5 and 10w 30 is A3/B3 and nether lists any other GM specs but Im sure they meet and/or exceed them
But most "30 grade" oils in the US actually have HT/HS viscosity below 3.5 cP due to fuel economy considerations.It might be an oversimplified view of the world but I see A3 as applicable to engines that need a 30 Grade (ie 3.5 HTHS).
Oh, you meant straight 30 grade. Got it now.Well an SAE 30 is usually 3.5 HTHS
I'd rather run an ACEA sequence oil that has demonstrated stay-in-grade performance rather than guess that a specific grade would necessarily be more stable.In a nutshell no, I wouldn’t use a 5W-30 in an engine calling for 10W-30. For instance, the Nissan VQ and whatever engine was in the Honda S2000 both favored 10w-30. They were known for shearing down oil.