need to know what motor oils and 2cycle oils are best for our cars I am not going to be running an omp. car is on a fresh rebuild by goopy and want it to last only taken out on weekends and really don't get on it that much but when I do [I do] thinking of brad penn oil 20 50 and [2 stroke oil don't know]

 

I'm partial to Idemitsu engine oil. Having said that, did you perform a search to find the 78 billion threads on engine oils for FDs ?

Also, a competent engine builder should have a wealth of information on hand concerning the engine he is building for you

 

Whatever oil you choose to use, make sure you stick with it and change it often. Unless you are draining every single drop out of your oil cooler and lines, you should change more regularly than the "5000" standard.

 

Castrol GTX 20/50 semm to be very well used and respected in this community

 

I have heard that as well. Definitely be careful with detergent oils and going from synthetic to non synthetic

 

if I may ask why? why is there an issue with mixing synthetic with non synthetic . they sell 50/50 synth dino blend oils on the market as is.

so why would having a little dino oil mixed into your synthetic be an issue?

 

Well I have heard that it is best to use conventional oil such as Castrol or Brad Penn for the break in period if there are new bearings and then switch to a quality synthetic such as Idemitsu or Royal Purple.

 

What!! The detergent suspends the dirt (combustion by-products), otherwise like non-detergent race oils you need to change oil after every race to flush the dirty out.