With the 10/30 syn in hundred degree weather my engine holds about 15 PSI at 700 RPM. 180 oil temp. I will try the o-ring on dipstick trick.

Last edited by 1Ton_tommy; 08/26/2025 8:05 PM.
1951 3800 1-ton
"Earning its keep from the get-go"
In the DITY Gallery
1962 261 (w/cam, Fenton headers, 2 carbs, MSD ign.), SM420 & Brown-Lipe 6231A 3spd aux. trans, stock axles & brakes. Owned since 1971.