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I changed the 302 gasser in my 95 Bronco over to Rotella 15w40 and noticed some improvements almost immediately. The oil clouded up as if it had disolved some grunge and the engine was much more responsive. The constant weep from the pan gasket also slowed down considerably. I'd like to stick with the Rotella for the next interval but I don't want to face the coming Chicago winter with that 15w40 in there.
I see Rotella 10w30 around here from time to time for 8.88/gal. The synthetic 5w40 is readily available, but it is at least double the price. Which do you think would be best for the winter? I am sure the next interval will see at least 10F and maybe even -20F at time or two. I don't doubt the synthetic is a better product, but is it really twice as good?
What do you all think?
Calvin
At those temps below 0, yes i do think that the 5w-40 is that much better.
X2