Compsyn, I am familiar with the diesel oil, but haven't looked at the racing oil.

Several years ago, when this whole SM oil controversy was just starting, I built a new engine for the TT340. I broke it in on Rotella, and then, at the recommendation of Amsoil, switched it to 5-30 diesel oil. It had run 500 miles on the Rotella without issue, and then failed 3 pushrods within 200 miles on the Amsoil. I replaced the pushrods and rockers and broke them in with Rotella again, then went to 15-40 Amsoil diesel oil, at their recommendation. The pushrods failed again within 300 miles. At that time, Amsoil would not tell me how much additive was in the oil, and they would not answer my question as to if they were using their same SM oil with soot additives. This was also during the period that they claimed older cars and small engines would be just fine on their SM oil. Their story has now changed on that. The pushrods and rockers were again replaced, broken in with Rotella, and then switched to Mobile 1 motorcycle oil and there have been no more issues. I guess I just don't trust Amsoil products anymore, justified, I don't know. I also don't know if the racing oil has reduced detergents, as many racing oils do.

The other issue is that I don't run synthetic oil in the daily drivers, so those would be of the question for me, anyway, on most of my vehicles.

I am glad that folks are finally starting to admit that the SM oils are a potential issue, and coming out with better oil packages, but there are weaknesses in most of them.

Diesel oils-many are now reduced additive and some of the additives are not the best for gas engines. There is little/no choice in low visocity non-synthetics.

Old car oil has good oil, but usually carries a solvent to swell seals, which is not for an engine in good condtion.

Motorcycle oils are great, but viscosity selection is limited.

As I said, using additive is not my first choice, but I think the choices I would like don't exist yet.

What I use:

TT340 1970 Chally-10-40 or 20-50 Mobil 1 motorcycle oil.

John Deere lawn tractor-air cooled-the same Mobil 1 10-40 or Brad Penn 10-30

Drivers-old Escort (200+k), Old Tracer (125+k), new Chev 6.0 campervan, new Honda crv--Castrol 5-30 SM oil with 1/2 bottle of EOS.

The only oil related (assumed) failures I have ever had in 40 years were the above mentioned pushrods on Amsoil.