Molil 1

• synthetic lubricants-aren't!

The parafin based 15w-40, Cx-4 rated oils have some pretty impressive specs. For what it's worth, this Mobil oil has a later rating than the syn. Maybe they haven't retested the syn lately.

Anyway, I started using syn's several years ago and have noticed improvements over prafin oils.

My observations:

Parafins stay cleaner longer. This is due to their tolerance for high temp; don't break down as readily as parafin oils.

On the other end, for a given weight, syn's have a significantly lower pour point; like today we were talking about -38F pour point for Mobil-1 15w-40.

Their molecular attachment (to metal) seems to be better. Initial start ups are cleaner. Case in point. Had a '88 F150, 302v8. After an oil change, lifters would always rattle before the pressure was up, even with my filling the oil filter prior to installation. With syn it never did it again.

Another. Had a rice burner 3 cyl diesel LT. Cold weather starts were always accompanied by significant piston skirt slapping (very noisy). Used syn and it quit.

What I have done, on all engines (except air cooled) is go 100% for a couple of changes then blend (my own blend, not storebought blend)about 20% syn with the parafin. Seems to work ok. Air cooled get 10% always. 1 change per year; stays clear all year.

Supposed to reduce friction which makes engines run cooler with better efficiency. Don't doubt the claims (make sense) but have no scientific nor empirical data to prove it personally.

Mark

As far as the others I use Rotella T, Delo, or Delvac interchangeably. Haven't noticed any difference.

Mark

Ok, the fine print: Either gas or diesel (I've yet to see a gas 930, but it's in my book) the original and still current recommendation for oil is #30, with a SJ/CD spec on the gasser, and a CD spec on the diesel. Mobil 1 will meet the SJ spec, but not the CD. Also, Mobil 1 isn't available in a #30.

Caveat: While the recommendation doesn't specifically name a multi-grade oil for your tractor (except under constant heavy loads in extreme cold weather), 15w40 (conventional) or 15w50 (syn. for gassers) would be fine. I can't think of a single 930 up in this area that is on #30.

And we are taught that the newer ratings (additives/test results) are improvements over previous and can be backfitted.

Mark

Oh, and you are right, the diesel recommendation for his application is also backwards compatible.

One of the threads (don't remember whose it was) mentioned that Delvac 1 was the Diesel syn. I think it is mentioned also on the site.

I have access to what I mentioned and not to that and since what I can get is Compression rated, I'll stick to that.

Syn has gotta be good as they are now doing ATF, 90w gear lube, and wheel bearing grease. Mobil and Valvoline seem to be the current pioneers where I shop, but surely everyone will be there too if not already.

Later,

Mark