In my 1951 Chevy, we installed a rebuilt SBC 350. When we first installed the motor, there was a slight valve leak on #8. The engine came to me as a "brand new rebuild" but I've since started to learn that it may have been slightly used with less than 250 miles and the previous owner decided to go another route. Anyways, I do not know if break in oil was used correctly after the rebuild or not. So I ran conventional 10w30 for about 500 miles along with a valve adjustment and then swapped to Mobil 1 10w30. After I've been driving on this motor for around 3000 miles since this change and we seem to have finally eliminated any signs of an issue in #8 (no oil usage, no oil on spark plus, no smoke from exhaust).
I'm contemplating swapping from Mobil 1 to Rotella and wondering if T4 or T6 would be more appropriate? We are running T4 in our 56 Chevy with strongly built 355. My motor is a mild build, RPM stays less than 3000 on a regular basis. I run right at 2500 RPM on the interstate doing 75 MPH, but normally run around 2000 RPM over longer distances at around 68 MPH.
Would a better option be to continue with Mobil 1 and swap the last quart for a single quart of Rotella or possibly a high mileage oil to provide some additional protection?
I'm also considering a change from 10w30 to 15w40 or 10w40 with our higher temps in south Georgia.
Appreciate any feedback provided.
I'm contemplating swapping from Mobil 1 to Rotella and wondering if T4 or T6 would be more appropriate? We are running T4 in our 56 Chevy with strongly built 355. My motor is a mild build, RPM stays less than 3000 on a regular basis. I run right at 2500 RPM on the interstate doing 75 MPH, but normally run around 2000 RPM over longer distances at around 68 MPH.
Would a better option be to continue with Mobil 1 and swap the last quart for a single quart of Rotella or possibly a high mileage oil to provide some additional protection?
I'm also considering a change from 10w30 to 15w40 or 10w40 with our higher temps in south Georgia.
Appreciate any feedback provided.