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Garychinook · 01-13-2016, 02:00 AM

Howdy,
Royal Purple RP is pretty good stuff. I use some of their gear oils in some racing applications with tremendous success. In one case it virtually eliminated axle wear that was a problem.
I believe when an oil mfr. states for modified engines they are usually talking about the ZDDP friction modifier additive package being at higher levels than is now acceptable for the latest cat converter cars. The higher ZDDP package indicative of off road/ racing oils is just what the Model A calls for and I for one am a big proponent of racing synthetics for off road or pre cat stuff.
While I am new to Model A stuff I have much experience with racing oils and plan on running a 20-50 / straight 40 or maybe 50 synthetic when my 31 is back on the road hopefully this summer.

Gary

01-13-2016, 02:00 AM	#4
Garychinook Member Join Date: Jul 2013 Location: Western WA state Posts: 63	Re: More about engine oils.. Howdy, Royal Purple RP is pretty good stuff. I use some of their gear oils in some racing applications with tremendous success. In one case it virtually eliminated axle wear that was a problem. I believe when an oil mfr. states for modified engines they are usually talking about the ZDDP friction modifier additive package being at higher levels than is now acceptable for the latest cat converter cars. The higher ZDDP package indicative of off road/ racing oils is just what the Model A calls for and I for one am a big proponent of racing synthetics for off road or pre cat stuff. While I am new to Model A stuff I have much experience with racing oils and plan on running a 20-50 / straight 40 or maybe 50 synthetic when my 31 is back on the road hopefully this summer. Gary