I have been running 5-30 the last few times, but now that Walmart has the 10-30 for $1, I am considering picking up the bottles and running them for the summer. Is the 10-30 going to be that much worse than paying $1.75 for 5-30 at AZ? It would be for a Regal GS(L67) and probably 4-5K mile OCI
Motorcraft 5-30 v 10-30
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I was more referring to the grp3 aspect of 5-30 that may or may not be in 10-30quote:
Originally posted by Ugly3:
In Texas it would probably make very little difference.
Good point. Can you pull up their website and look at the MSDS's for the two grades. If there is much of a difference in the percentages for each listed CAS number, then maybe one is better. I know (last time I looked) the MSDS's for Valvoline Durablend suggest that the 5w30 and 10w40 have much more Group II/III than either the 10w30 or 15w50. In contrast, the MSDS's for Maxlife showed the same proportions across all grades. However, I would prefer a 10w30 over 5w30, especially in TX.
You think i am worrying about nothing, and should just run the crap out of the 10-30?
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