I ran a 500 miles UOA on my 1954 Plymouth 230 flathead....never rebuilt, OEM motor.
5 quarts Pennzoil SAE30 conventional and one quart of Valvoline 10w-30 Vr1 racing oil, the blue stuff.
I dropped the oil because it wreaks of gas, and also wondered if I could go two years on a oil change...guess not.
The really bad news from the UOA that came from it was the following:
Lead 531
water 0.34
Viscosity could not be determined due to water content.
I really think the lead came from the deposits in the engine, that were diluted with gas. Before I installed the motor (which came from the donor 54 Chip Foose made his Sniper from) it had a nice "caking" of grey deposits all over the interior of the engine...I figured lead.
But I am stumped on the water. I only drive the 500 miles a year, and the drives are long, and oil pressure stays high at driving speeds, and 10-15 at idle...hot.
I changed the oil with 5 quarts 5w-50 Castrol .99 AZ special and left the filter.
5 quarts Pennzoil SAE30 conventional and one quart of Valvoline 10w-30 Vr1 racing oil, the blue stuff.
I dropped the oil because it wreaks of gas, and also wondered if I could go two years on a oil change...guess not.
The really bad news from the UOA that came from it was the following:
Lead 531
water 0.34
Viscosity could not be determined due to water content.
I really think the lead came from the deposits in the engine, that were diluted with gas. Before I installed the motor (which came from the donor 54 Chip Foose made his Sniper from) it had a nice "caking" of grey deposits all over the interior of the engine...I figured lead.
But I am stumped on the water. I only drive the 500 miles a year, and the drives are long, and oil pressure stays high at driving speeds, and 10-15 at idle...hot.
I changed the oil with 5 quarts 5w-50 Castrol .99 AZ special and left the filter.